How long is the flight from London to Washington, D.C. Dulles Intl Airport?

For as low as £435, United Airlines can have you in Washington, D.C. Dulles Intl Airport from London in 8h 55m. London and Washington, D.C. Dulles Intl Airport are separated by a distance of 3664 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

What are the cheapest airlines flying from London to Washington, D.C. Dulles Intl Airport round-trip?

Our cheapest airline available from London to Washington, D.C. Dulles Intl Airport is Icelandair. Our recent data shows that you can find tickets from as low as £322 on this airline. Additional options worth looking into are Aer Lingus and TAP AIR PORTUGAL, starting at £361 and £381 round-trip. Users have found that Icelandair is 39% cheaper than the other options available to this destination.

What are the cheapest airlines to fly from London to Washington, D.C. Dulles Intl Airport one-way?

The cheapest airline one-way is British Airways, with whom users have recently found tickets for as low as £342. However, be on the lookout for offers from Aer Lingus and United Airlines, as they are both options that can get you from London to Washington, D.C. Dulles Intl Airport for a low price.

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 66.0 - 102.0 inches per month. May is typically the wettest month, when rainfall can reach 102.0 mm. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 66.0 mm.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 2.0 C).

What are the most popular routes from London to Washington, D.C. Dulles Intl Airport?

The most popular flight routes from London to Washington, D.C. Dulles Intl Airport are London Heathrow - Washington, D.C. Dulles Intl, London Gatwick - Washington, D.C. Dulles Intl and London Stansted - Washington, D.C. Dulles Intl.

What are the cheapest flights from London to Washington, D.C. Dulles Intl Airport?

On average you can expect to pay £1,511 for a flight from London to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is £460 while the most popular route, (London Heathrow - Washington, D.C. Dulles Intl) is currently priced at £319.

What are the most reliable airlines from London to Washington, D.C. Dulles Intl Airport?

Before booking your flight to Washington, D.C. Dulles Intl Airport from London, check out the most reliable airlines to get you to your destination on time: Air Canada (83%), Austrian Airlines (83%), Copa Airlines( 83%).

What are the most popular airlines that fly from London to Washington, D.C. Dulles Intl Airport?

The most popular airlines flying from London to Washington, D.C. Dulles Intl Airport are Virgin Atlantic, British Airways and Lufthansa. Something to consider prior to booking your flight.

Can I find deals for flights from London to Dulles Intl that include hotel bookings?

Yes. In addition to deals on London to Dulles Intl flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from London to Dulles Intl?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Dulles Intl.

Can I find deals for business class flights from London to Dulles Intl?

Yes. Cheapflights offers flight deals from London to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£327+ Cheap Flights from London to Washington, D.C. Dulles Intl Airport

Cheapflights Tip: The best prices from London to Washington, D.C. Dulles Intl are usually found in September or March, booked 84 days in advance, depart on a Friday or Thursday and return on a Monday

Cheap flight deals from London to Dulles Intl

Enter your travel dates to find the best prices.

Cheapest

Best

Direct

Last-minute

One-way

Cheapest flights from London to Dulles Intl
Explore the most affordable flight options available from London to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 August 2026.

Fri 28/806:50 -

1 stop11h 40m

Fri 4/919:20 -

1 stop33h 20m

Deal found 12/8£430

Sun 13/1211:55 -

1 stop11h 35m

Thu 7/119:40 -

1 stop10h 15m

Deal found 9/8£430

Tue 22/909:15 -

1 stop12h 30m

Wed 7/1020:20 -

1 stop16h 05m

Deal found 12/8£430

Sat 26/908:30 -

1 stop11h 40m

Sat 3/1018:35 -

Nonstop7h 20m

Deal found 12/8£431

Thu 27/813:00 -

1 stop11h 20m

Thu 10/920:30 -

1 stop13h 10m

Deal found 11/8£431

Wed 26/809:30 -

1 stop11h 35m

Fri 11/922:05 -

Nonstop7h 35m

Deal found 11/8£432

Wed 2/915:40 -

1 stop11h 35m

Sat 5/920:30 -

1 stop10h 15m

Deal found 8/8£432

Tue 20/1009:15 -

1 stop12h 30m

Tue 27/1018:45 -

2 stops19h 45m

Deal found 7/8£432

Tue 13/1009:30 -

1 stop11h 35m

Tue 27/1012:50 -

2 stops14h 20m

Deal found 12/8£432

Tue 1/913:00 -

1 stop11h 20m

Sun 6/920:30 -

1 stop13h 10m

Deal found 11/8£432

Wed 7/1009:30 -

1 stop11h 35m

Tue 20/1012:38 -

2 stops12h 52m

Deal found 12/8£433

Thu 24/916:40 -

Nonstop8h 40m

Thu 15/1018:35 -

Nonstop7h 20m

Deal found 11/8£434

Best flights from London to Dulles Intl
Discover carefully curated flight deals from London to Dulles Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 13 August 2026.

Sun 27/906:30 -

1 stop12h 05m

Sun 4/1018:35 -

Nonstop7h 20m

Deal found 12/8£431

Thu 24/1216:20 -

Nonstop8h 55m

Thu 7/122:15 -

Nonstop7h 35m

Deal found 8/8£435

Thu 17/1206:30 -

1 stop14h 15m

Mon 4/111:05 -

2 stops15h 10m

Deal found 12/8£442

Wed 6/112:15 -

Nonstop8h 25m

Wed 20/118:05 -

Nonstop7h 10m

Deal found 9/8£443

Thu 10/912:15 -

Nonstop8h 15m

Wed 16/922:05 -

Nonstop7h 35m

Deal found 12/8£455

Thu 17/910:25 -

2 stops19h 16m

Mon 21/910:15 -

2 stops18h 25m

Deal found 9/8£463

Wed 26/815:40 -

1 stop32h 40m

Fri 18/923:20 -

1 stop10h 20m

Deal found 10/8£464

Fri 6/1110:00 -

1 stop10h 55m

Wed 18/1118:15 -

1 stop10h 15m

Deal found 8/8£471

Tue 1/921:15 -

2 stops22h 55m

Tue 1/1217:25 -

1 stop11h 25m

Deal found 12/8£475

Wed 11/1119:05 -

1 stop25h 25m

Tue 1/1217:25 -

1 stop14h 25m

Deal found 12/8£510

Mon 5/1010:50 -

1 stop29h 40m

Fri 9/1013:15 -

1 stop15h 40m

Deal found 11/8£694

Thu 24/1216:20 -

Nonstop8h 55m

Fri 8/118:20 -

Nonstop7h 20m

Deal found 8/8£435

Fri 13/1116:20 -

Nonstop8h 55m

Thu 3/1218:20 -

Nonstop7h 20m

Deal found 12/8£454

Sat 19/915:50 -

Nonstop8h 25m

Sun 27/922:05 -

Nonstop7h 35m

Deal found 12/8£455

Wed 16/910:25 -

2 stops19h 16m

Mon 28/908:08 -

2 stops20h 32m

Deal found 10/8£467

Fri 11/1212:05 -

Nonstop8h 35m

Sat 2/106:10 -

1 stop18h 45m

Deal found 11/8£437

Tue 1/916:25 -

1 stop27h 45m

Mon 30/1117:25 -

1 stop11h 25m

Deal found 12/8£503

Sat 3/1010:25 -

1 stop14h 10m

Sat 10/1021:45 -

1 stop13h 15m

Deal found 8/8£460

Thu 24/910:25 -

2 stops16h 19m

Mon 28/908:08 -

2 stops20h 32m

Deal found 7/8£468

Fri 5/212:05 -

Nonstop8h 35m

Sat 6/222:15 -

Nonstop7h 35m

Deal found 8/8£443

Mon 24/810:00 -

1 stop10h 35m

Mon 21/918:10 -

1 stop9h 40m

Deal found 10/8£554

Tue 29/917:00 -

2 stops23h 45m

Thu 5/1118:32 -

2 stops16h 13m

Deal found 8/8£470

Wed 2/916:25 -

1 stop27h 45m

Mon 12/422:35 -

1 stop12h 00m

Deal found 12/8£523

Thu 12/1119:05 -

1 stop25h 25m

Wed 2/1217:25 -

1 stop14h 25m

Deal found 9/8£581

Wed 11/1112:05 -

Nonstop8h 35m

Mon 30/1122:15 -

Nonstop7h 35m

Deal found 12/8£454

Fri 13/1110:00 -

1 stop10h 55m

Thu 3/1217:45 -

1 stop9h 25m

Deal found 12/8£501

Sat 3/1017:00 -

2 stops23h 45m

Sat 10/1021:45 -

1 stop13h 15m

Deal found 8/8£473

Sat 29/809:15 -

2 stops18h 00m

Sat 12/920:30 -

2 stops19h 35m

Deal found 7/8£574

Thu 10/919:15 -

1 stop25h 10m

Wed 16/917:45 -

1 stop13h 50m

Deal found 11/8£581

Thu 15/1021:20 -

2 stops22h 05m

Wed 21/1017:45 -

2 stops21h 45m

Deal found 7/8£539

Find flight deals from London to Dulles Intl

Round-trip from	£430
One-way from	£327
Popular in	December
Cheapest in	September
Average price	£553
Good round-trip deal	£529 or less
Good one-way deal	£548 or less

Brussels Airlines
28/8-4/9
2 total stops
45h 00m total
London to Washington, D.C.

Search Deals

10/11
3 total stops
39h 25m total
London to Washington, D.C.

Search Deals

High demand for flights, 0% potential price rise

Search Deals

Cheapest flight prices on average. 0% potential price decrease (£3 potential savings vs. average return price).

Search Deals

Average for round-trip flights in August 2026

Search Deals

Price to beat on a round-trip flight from London (LON) to Washington, D.C. Dulles Intl.

Search Deals

Price to beat on a one-way flight from London (LON) to Washington, D.C. Dulles Intl.

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from London to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonWashington, D.C.

LHR London Heathrow - IAD Washington, D.C. Dulles Intl

LHRIAD

London Heathrow

Sun 27/9

06:30-13:35

1 stop12h 05m

Washington, D.C. Dulles Intl

Sun 4/10

18:35-06:55

Nonstop7h 20m

£431

LondonWashington, D.C.

LHR London Heathrow - IAD Washington, D.C. Dulles Intl

LHRIAD

London Heathrow

Thu 24/12

16:20-20:15

Nonstop8h 55m

Washington, D.C. Dulles Intl

Thu 7/1

22:15-10:50

Nonstop7h 35m

£435

LondonWashington, D.C.

LHR London Heathrow - IAD Washington, D.C. Dulles Intl

LHRIAD

London Heathrow

Thu 24/12

16:20-20:15

Nonstop8h 55m

Washington, D.C. Dulles Intl

Fri 8/1

18:20-06:40

Nonstop7h 20m

£435

LondonWashington, D.C.

LHR London Heathrow - IAD Washington, D.C. Dulles Intl

LHRIAD

London Heathrow

Fri 11/12

12:05-15:40

Nonstop8h 35m

Washington, D.C. Dulles Intl

Sat 2/1

06:10-05:55

1 stop18h 45m

£437

LondonWashington, D.C.

LHR London Heathrow - IAD Washington, D.C. Dulles Intl

LHRIAD

London Heathrow

Thu 17/12

06:30-15:45

1 stop14h 15m

Washington, D.C. Dulles Intl

Mon 4/1

11:05-07:15

2 stops15h 10m

£442

Fastest return journey

LondonWashington, D.C.

LHR London Heathrow - IAD Washington, D.C. Dulles Intl

LHRIAD

London Heathrow

Wed 6/1

12:15-15:40

Nonstop8h 25m

Washington, D.C. Dulles Intl

Wed 20/1

18:05-06:15

Nonstop7h 10m

£443

LondonWashington, D.C.

LHR London Heathrow - IAD Washington, D.C. Dulles Intl

LHRIAD

London Heathrow

Fri 5/2

12:05-15:40

Nonstop8h 35m

Washington, D.C. Dulles Intl

Sat 6/2

22:15-10:50

Nonstop7h 35m

£443

LondonWashington, D.C.

LHR London Heathrow - IAD Washington, D.C. Dulles Intl

LHRIAD

London Heathrow

Fri 13/11

16:20-20:15

Nonstop8h 55m

Washington, D.C. Dulles Intl

Thu 3/12

18:20-06:40

Nonstop7h 20m

£454

LondonWashington, D.C.

LHR London Heathrow - IAD Washington, D.C. Dulles Intl

LHRIAD

London Heathrow

Wed 11/11

12:05-15:40

Nonstop8h 35m

Washington, D.C. Dulles Intl

Mon 30/11

22:15-10:50

Nonstop7h 35m

£454

LondonWashington, D.C.

LHR London Heathrow - IAD Washington, D.C. Dulles Intl

LHRIAD

London Heathrow

Thu 10/9

12:15-15:30

Nonstop8h 15m

Washington, D.C. Dulles Intl

Wed 16/9

22:05-10:40

Nonstop7h 35m

£455

Flights are sorted by cheapest return flights first.

Deals found on 12/8

Showing 1-10 of 60 resultsSorted by cheapest first

...

Best time to book a flight from London to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from London with our price prediction graph.

LON-IAD

LTN-IAD

LHR-IAD

LGW-IAD

STN-IAD

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from London to Washington, D.C. Dulles Intl Airport

LON-IAD

LTN-IAD

LHR-IAD

LGW-IAD

STN-IAD

What is the cheapest month to book a flight from London to Washington, D.C. Dulles Intl Airport?

Currently, February is the cheapest month in which you can book a flight from London to Washington, D.C. Dulles Intl Airport (average of £479). Flying from London to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £576). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from LON to IAD?

When flying from London to Washington, D.C. Dulles Intl Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from London to Washington, D.C. Dulles Intl Airport

The most flights from LON to IAD are scheduled on a Wednesday (29 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (22 on average).

How much does it cost for a return flight from London to Washington, D.C. Dulles Intl Airport?

Airfare is below average for this route at the moment.

London to Washington, D.C. Dulles Intl Airport flights typically cost between £489 and £643 in August.
The cheapest return price found within the last 5 days was £430 on Brussels Airlines (28 Aug–4 Sept).

What’s the top stopover airport for flights from London to Washington, D.C. Dulles Intl Airport?

Dublin (DUB) – chosen by Cheapflights users on 40% of one-stop itineraries from London to Washington, D.C. Dulles Intl Airport on Cheapflights.

What’s the cheapest stopover airport for flights from London to Washington, D.C. Dulles Intl Airport?

Reykjavik (KEF) is the most affordable one-stop option, with an average return flight price of £418.

What’s the fastest stopover option from London to Washington, D.C. Dulles Intl Airport?

Flights via Amsterdam (AMS) have the shortest average one-way travel time for one-stop routes: 11h 15m.

Which airport typically offers the quickest stopover for flights from London to Washington, D.C. Dulles Intl Airport?

Flights via Charlotte (CLT) offer the fastest connection on this route, with an average stopover time of 1h 14m.

How often are flights from London to Washington, D.C. delayed?

About 17% of weekly flights between London and Washington, D.C. have experienced delays in the past year, with the average delay time being 141 minutes.

What is the most punctual flight time for London to Washington, D.C. flights?

Historically, flights departing in the evening are less likely to be delayed, whereas flights leaving in the morning tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Saturday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on London to Washington, D.C. flights?

Over the past year, United Airlines have had the lowest number of delays on this route, with just 11% of flights being delayed.

How far ahead should I book a flight from London to Washington, D.C. Dulles Intl Airport?

The best time to book flights from London to Washington, D.C. Dulles Intl Airport is 81 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

Reviews of airlines servicing Dulles Intl

Read through reviews of airlines operating flights from London to Washington, D.C. Dulles Intl Airport, such as Virgin Atlantic,United Airlines, andAer Lingus. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Virgin Atlantic

7.5

Good

694 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.

Virgin Atlantic

7.5

Good

694 reviews

Virgin Atlantic

7.5

Good

694 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.

United Airlines

7.4

Good

10,115 reviews

Virgin Atlantic

7.5

Good

694 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.

Aer Lingus

7.3

Good

1,697 reviews

Virgin Atlantic

7.5

Good

694 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.

Lufthansa

6.8

Okay

8,182 reviews

Virgin Atlantic

7.5

Good

694 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.

British Airways

6.7

Okay

8,161 reviews

Virgin Atlantic

7.5

Good

694 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.

Related info for your journey

How long is the flight from London to Washington, D.C. Dulles Intl Airport?
For as low as £435, United Airlines can have you in Washington, D.C. Dulles Intl Airport from London in 8h 55m. London and Washington, D.C. Dulles Intl Airport are separated by a distance of 3664 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What are the cheapest airlines flying from London to Washington, D.C. Dulles Intl Airport round-trip?
Our cheapest airline available from London to Washington, D.C. Dulles Intl Airport is Icelandair. Our recent data shows that you can find tickets from as low as £322 on this airline. Additional options worth looking into are Aer Lingus and TAP AIR PORTUGAL, starting at £361 and £381 round-trip. Users have found that Icelandair is 39% cheaper than the other options available to this destination.
What are the cheapest airlines to fly from London to Washington, D.C. Dulles Intl Airport one-way?
The cheapest airline one-way is British Airways, with whom users have recently found tickets for as low as £342. However, be on the lookout for offers from Aer Lingus and United Airlines, as they are both options that can get you from London to Washington, D.C. Dulles Intl Airport for a low price.
What are the most popular routes from London to Washington, D.C. Dulles Intl Airport?
The most popular flight routes from London to Washington, D.C. Dulles Intl Airport are London Heathrow - Washington, D.C. Dulles Intl, London Gatwick - Washington, D.C. Dulles Intl and London Stansted - Washington, D.C. Dulles Intl.
What are the most reliable airlines from London to Washington, D.C. Dulles Intl Airport?
Before booking your flight to Washington, D.C. Dulles Intl Airport from London, check out the most reliable airlines to get you to your destination on time: Air Canada (83%), Austrian Airlines (83%), Copa Airlines( 83%).
What are the cheapest flights from London to Washington, D.C. Dulles Intl Airport?
On average you can expect to pay £1,511 for a flight from London to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is £460 while the most popular route, (London Heathrow - Washington, D.C. Dulles Intl) is currently priced at £319.
Can I find deals for flights from London to Dulles Intl that include hotel bookings?
Yes. In addition to deals on London to Dulles Intl flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from London to Dulles Intl?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Dulles Intl.
Can I find deals for business class flights from London to Dulles Intl?
Yes. Cheapflights offers flight deals from London to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from London to Washington, D.C. Dulles Intl Airport?
Currently, February is the cheapest month in which you can book a flight from London to Washington, D.C. Dulles Intl Airport (average of £479). Flying from London to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £576). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Fly from London to Dulles Intl on these airlines

Virgin Atlantic flights from London to Washington, D.C. Dulles Intl

British Airways flights from London to Washington, D.C. Dulles Intl

Top 10 airlines flying from London to Dulles Intl

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest£322	Average£413	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Aer Lingus	Cheapest£361	Average£565	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
TAP AIR PORTUGAL	Cheapest£381	Average£448	FlexibilityNo cancel fee	On-timeN/A	Search TAP AIR PORTUGAL flights
Virgin Atlantic	Cheapest£395	Average£540	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Lufthansa	Cheapest£402	Average£562	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
British Airways	Cheapest£403	Average£553	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Air France	Cheapest£405	Average£644	FlexibilityNo cancel fee	On-time77%	Search Air France flights
Scandinavian Airlines	Cheapest£407	Average£474	FlexibilityNo cancel fee	On-time77%	Search Scandinavian Airlines flights
Finnair	Cheapest£415	Average£597	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
Austrian Airlines	Cheapest£417	Average£568	FlexibilityNo cancel fee	On-time78%	Search Austrian Airlines flights

Fly with Cheapflights

How does Cheapflights help users find flights from London to Dulles Intl?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Dulles Intl from London today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from London to Dulles Intl?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from London to Dulles Intl.

Can Cheapflights find flights from London to Dulles Intl with no change fees?

Certainly. Search results for flights to Dulles Intl from London shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from London to Dulles Intl become cheaper?

Of course! You can now track prices for flights from London to Dulles Intl and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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Cheap flights from London to Washington, D.C. Dulles Intl Airport from £327

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from London to Dulles Intl

Cheapest flights from London to Dulles IntlExplore the most affordable flight options available from London to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 August 2026.

Explore the most affordable flight options available from London to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 August 2026.

Best flights from London to Dulles IntlDiscover carefully curated flight deals from London to Dulles Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 13 August 2026.

Discover carefully curated flight deals from London to Dulles Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 13 August 2026.

Direct flights from London to Dulles IntlExplore direct flight options from London to Dulles Intl based on user searches, and compare prices and availability for your desired travel dates. Data last updated 13 August 2026.

Explore direct flight options from London to Dulles Intl based on user searches, and compare prices and availability for your desired travel dates. Data last updated 13 August 2026.

Last-minute flights from London to Dulles IntlDiscover last-minute flight deals from London to Dulles Intl. Data last updated 13 August 2026 and is based on user searches.

Discover last-minute flight deals from London to Dulles Intl. Data last updated 13 August 2026 and is based on user searches.

One-way flights from London to Dulles IntlSearch for one-way flight options from London to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated 13 August 2026.

Search for one-way flight options from London to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated 13 August 2026.

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Use the filters below to find and compare flights from London to Washington, D.C. Dulles Intl Airport that are best for you.

Best time to book a flight from London to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from London with our price prediction graph.

Cheapflights Insights

What is the cheapest month to book a flight from London to Washington, D.C. Dulles Intl Airport?

What is the cheapest time of day to fly from LON to IAD?

Find hourly flight availability from London to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 13 August 2026.

When flying from London to Washington, D.C. Dulles Intl Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from London to Washington, D.C. Dulles Intl Airport

Explore weekly flight availability from London to Dulles Intl. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 13 August 2026.

The most flights from LON to IAD are scheduled on a Wednesday (29 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (22 on average).

How much does it cost for a return flight from London to Washington, D.C. Dulles Intl Airport?

Airfare is below average for this route at the moment.

London to Washington, D.C. Dulles Intl Airport flights typically cost between £489 and £643 in August.The cheapest return price found within the last 5 days was £430 on Brussels Airlines (28 Aug–4 Sept).

What’s the top stopover airport for flights from London to Washington, D.C. Dulles Intl Airport?

Share of one-stop return flights from London to Washington, D.C. Dulles Intl Airport chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Dublin (DUB) – chosen by Cheapflights users on 40% of one-stop itineraries from London to Washington, D.C. Dulles Intl Airport on Cheapflights.

What’s the cheapest stopover airport for flights from London to Washington, D.C. Dulles Intl Airport?

Average return fare for one-stop flights from London to Washington, D.C. Dulles Intl Airport, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

Reykjavik (KEF) is the most affordable one-stop option, with an average return flight price of £418.

What’s the fastest stopover option from London to Washington, D.C. Dulles Intl Airport?

Shortest average travel time for one-stop one-way flights from London to Washington, D.C. Dulles Intl Airport, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Flights via Amsterdam (AMS) have the shortest average one-way travel time for one-stop routes: 11h 15m.

Which airport typically offers the quickest stopover for flights from London to Washington, D.C. Dulles Intl Airport?

Average stopover duration for one-stop one-way flights from London to Washington, D.C. Dulles Intl Airport, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Charlotte (CLT) offer the fastest connection on this route, with an average stopover time of 1h 14m.

How often are flights from London to Washington, D.C. delayed?

About 17% of weekly flights between London and Washington, D.C. have experienced delays in the past year, with the average delay time being 141 minutes.

What is the most punctual flight time for London to Washington, D.C. flights?

Historically, flights departing in the evening are less likely to be delayed, whereas flights leaving in the morning tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Saturday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on London to Washington, D.C. flights?

Over the past year, United Airlines have had the lowest number of delays on this route, with just 11% of flights being delayed.

How far ahead should I book a flight from London to Washington, D.C. Dulles Intl Airport?

The best time to book flights from London to Washington, D.C. Dulles Intl Airport is 81 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

Reviews of airlines servicing Dulles Intl

Read through reviews of airlines operating flights from London to Washington, D.C. Dulles Intl Airport, such as Virgin Atlantic,United Airlines, andAer Lingus. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

How long is the flight from London to Washington, D.C. Dulles Intl Airport?

What are the cheapest airlines flying from London to Washington, D.C. Dulles Intl Airport round-trip?

What are the cheapest airlines to fly from London to Washington, D.C. Dulles Intl Airport one-way?

What are the most popular routes from London to Washington, D.C. Dulles Intl Airport?

What are the most reliable airlines from London to Washington, D.C. Dulles Intl Airport?

What are the cheapest flights from London to Washington, D.C. Dulles Intl Airport?

Can I find deals for flights from London to Dulles Intl that include hotel bookings?

How can I find direct flights from London to Dulles Intl?

Can I find deals for business class flights from London to Dulles Intl?

What is the cheapest month to book a flight from London to Washington, D.C. Dulles Intl Airport?

Travelling to a place near Washington, D.C. Dulles Intl Airport?

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Fly from London to Dulles Intl on these airlines

Choose from the following airlines for your flight from London to Dulles Intl. Flights are based on user searches made on Cheapflights and were last updated on 13 August 2026.

Alternative routes for London to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Dulles Intl by adding a car hire and/or hotel booking to your travel itinerary.

Cheapest flights from London to Dulles Intl
Explore the most affordable flight options available from London to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 August 2026.

Best flights from London to Dulles Intl
Discover carefully curated flight deals from London to Dulles Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 13 August 2026.

Direct flights from London to Dulles Intl
Explore direct flight options from London to Dulles Intl based on user searches, and compare prices and availability for your desired travel dates. Data last updated 13 August 2026.

Last-minute flights from London to Dulles Intl
Discover last-minute flight deals from London to Dulles Intl. Data last updated 13 August 2026 and is based on user searches.

One-way flights from London to Dulles Intl
Search for one-way flight options from London to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated 13 August 2026.

London to Washington, D.C. Dulles Intl Airport flights typically cost between £489 and £643 in August.
The cheapest return price found within the last 5 days was £430 on Brussels Airlines (28 Aug–4 Sept).