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 £362 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 £343. 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 City - 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 £1,512 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 £325.

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.

£328+ 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 10 August 2026.

Thu 3/909:50 -

1 stop10h 55m

Wed 9/917:15 -

1 stop9h 50m

Deal found 6/8£430

Sun 13/1211:55 -

1 stop11h 35m

Thu 7/119:40 -

1 stop10h 15m

Deal found 7/8£430

Mon 7/909:15 -

1 stop12h 30m

Mon 7/920:20 -

1 stop11h 15m

Deal found 6/8£430

Mon 21/1211:05 -

1 stop32h 25m

Wed 20/122:15 -

Nonstop7h 35m

Deal found 10/8£431

Tue 1/913:00 -

1 stop14h 15m

Mon 14/920:30 -

1 stop13h 10m

Deal found 7/8£431

Mon 24/808:30 -

1 stop11h 45m

Mon 21/918:35 -

Nonstop7h 20m

Deal found 10/8£432

Fri 4/915:40 -

1 stop11h 35m

Thu 10/920:30 -

1 stop13h 10m

Deal found 7/8£432

Tue 20/1009:15 -

1 stop12h 30m

Tue 27/1018:45 -

2 stops19h 45m

Deal found 7/8£432

Thu 15/1012:15 -

Nonstop8h 15m

Sun 18/1022:05 -

Nonstop7h 35m

Deal found 10/8£433

Tue 15/915:40 -

1 stop32h 40m

Fri 25/923:20 -

1 stop10h 20m

Deal found 7/8£433

Fri 2/1012:15 -

Nonstop8h 15m

Tue 6/1018:35 -

Nonstop7h 20m

Deal found 10/8£433

Wed 30/908:20 -

2 stops16h 54m

Sun 4/1018:26 -

1 stop10h 54m

Deal found 10/8£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 10 August 2026.

Sat 26/1216:20 -

Nonstop8h 55m

Thu 31/1218:20 -

Nonstop7h 20m

Deal found 5/8£435

Mon 2/1116:20 -

Nonstop8h 55m

Sun 8/1118:20 -

Nonstop7h 20m

Deal found 9/8£437

Thu 3/912:15 -

Nonstop8h 15m

Wed 9/922:05 -

Nonstop7h 35m

Deal found 6/8£437

Wed 26/815:40 -

1 stop32h 40m

Fri 18/923:20 -

1 stop10h 20m

Deal found 10/8£465

Tue 22/909:20 -

1 stop11h 15m

Tue 29/912:26 -

2 stops14h 29m

Deal found 7/8£470

Fri 20/1110:00 -

1 stop10h 55m

Fri 27/1118:15 -

1 stop10h 15m

Deal found 6/8£470

Wed 26/817:55 -

Nonstop8h 00m

Mon 7/922:05 -

Nonstop7h 35m

Deal found 10/8£482

Thu 3/921:20 -

2 stops22h 50m

Mon 7/922:35 -

2 stops16h 50m

Deal found 10/8£505

Wed 30/1212:15 -

Nonstop8h 25m

Thu 11/321:45 -

Nonstop7h 15m

Deal found 8/8£565

Sun 30/819:15 -

1 stop25h 15m

Sun 7/217:25 -

1 stop14h 25m

Deal found 9/8£615

Wed 16/917:45 -

1 stop22h 45m

Wed 23/921:40 -

1 stop38h 00m

Deal found 7/8£685

Thu 24/1216:20 -

Nonstop8h 55m

Thu 7/122:15 -

Nonstop7h 35m

Deal found 8/8£436

Wed 2/909:15 -

2 stops18h 00m

Wed 9/920:30 -

2 stops19h 35m

Deal found 5/8£446

Sat 31/1008:40 -

1 stop12h 15m

Sun 8/1117:45 -

1 stop10h 45m

Deal found 9/8£470

Fri 4/908:25 -

2 stops20h 01m

Mon 7/918:10 -

1 stop10h 20m

Deal found 7/8£476

Thu 24/1216:20 -

Nonstop8h 55m

Fri 8/118:20 -

Nonstop7h 20m

Deal found 8/8£436

Wed 23/1216:35 -

1 stop27h 40m

Sun 3/122:30 -

2 stops17h 05m

Deal found 6/8£513

Wed 30/1211:55 -

1 stop11h 35m

Sun 3/119:40 -

1 stop10h 15m

Deal found 8/8£530

Sat 5/916:40 -

Nonstop8h 20m

Fri 11/915:45 -

1 stop13h 15m

Deal found 8/8£440

Sat 5/910:00 -

1 stop10h 35m

Fri 11/917:30 -

1 stop9h 25m

Deal found 8/8£539

Wed 9/913:50 -

1 stop10h 35m

Tue 15/917:15 -

1 stop15h 10m

Deal found 6/8£512

Wed 26/810:00 -

2 stops19h 34m

Sun 30/817:30 -

1 stop18h 50m

Deal found 10/8£515

Mon 24/810:25 -

1 stop14h 10m

Tue 22/918:15 -

1 stop10h 10m

Deal found 10/8£542

Fri 25/910:35 -

1 stop15h 00m

Sat 3/1017:05 -

1 stop11h 40m

Deal found 9/8£545

Sat 19/1211:45 -

Nonstop8h 40m

Sun 3/118:55 -

Nonstop7h 25m

Deal found 5/8£558

Sat 29/809:30 -

1 stop11h 35m

Sat 12/908:35 -

2 stops16h 55m

Deal found 7/8£465

Thu 3/913:00 -

1 stop11h 10m

Wed 9/920:55 -

1 stop19h 20m

Deal found 5/8£519

Sun 20/920:45 -

1 stop23h 50m

Thu 24/917:40 -

1 stop18h 40m

Deal found 6/8£519

Mon 2/1116:35 -

1 stop27h 10m

Sun 8/1122:30 -

1 stop12h 15m

Deal found 9/8£559

Thu 24/917:35 -

1 stop22h 55m

Mon 28/921:40 -

1 stop38h 10m

Deal found 7/8£685

Find flight deals from London to Dulles Intl

Round-trip from	£430
One-way from	£328
Popular in	December
Cheapest in	September
Average price	£553
Good round-trip deal	£530 or less
Good one-way deal	£548 or less

Lufthansa
27/9-29/9
1 total stop
21h 10m total
London to Washington, D.C.

Search Deals

Aer Lingus
16/10
1 total stop
12h 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

Sat 26/12

16:20-20:15

Nonstop8h 55m

Washington, D.C. Dulles Intl

Thu 31/12

18:20-06:40

Nonstop7h 20m

£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

Thu 7/1

22:15-10:50

Nonstop7h 35m

£436

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

£436

LondonWashington, D.C.

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

LHRIAD

London Heathrow

Mon 2/11

16:20-20:15

Nonstop8h 55m

Washington, D.C. Dulles Intl

Sun 8/11

18:20-06:40

Nonstop7h 20m

£437

LondonWashington, D.C.

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

LHRIAD

London Heathrow

Thu 3/9

12:15-15:30

Nonstop8h 15m

Washington, D.C. Dulles Intl

Wed 9/9

22:05-10:40

Nonstop7h 35m

£437

LondonWashington, D.C.

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

LHRIAD

London Heathrow

Sat 5/9

16:40-20:00

Nonstop8h 20m

Washington, D.C. Dulles Intl

Fri 11/9

15:45-10:00

1 stop13h 15m

£440

LondonWashington, D.C.

LTN London Luton - IAD Washington, D.C. Dulles Intl

LTNIAD

London Luton

Wed 2/9

09:15-22:15

2 stops18h 00m

Washington, D.C. Dulles Intl

Wed 9/9

20:30-21:05

2 stops19h 35m

£446

LondonWashington, D.C.

LGW London Gatwick - IAD Washington, D.C. Dulles Intl

LGWIAD

London Gatwick

Wed 26/8

15:40-19:20

1 stop32h 40m

Washington, D.C. Dulles Intl

Fri 18/9

23:20-14:40

1 stop10h 20m

£465

LondonWashington, D.C.

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

LHRIAD

London Heathrow

Sat 29/8

09:30-16:05

1 stop11h 35m

Washington, D.C. Dulles Intl

Sat 12/9

08:35-06:30

2 stops16h 55m

£465

LondonWashington, D.C.

LCY London City - IAD Washington, D.C. Dulles Intl

LCYIAD

London City

Tue 22/9

09:20-15:35

1 stop11h 15m

Washington, D.C. Dulles Intl

Tue 29/9

12:26-07:55

2 stops14h 29m

£470

Flights are sorted by cheapest return flights first.

Deals found on 10/8

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

SEN-IAD

LHR-IAD

LGW-IAD

LCY-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

SEN-IAD

LHR-IAD

LGW-IAD

LCY-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 Friday (29 on average). You will have fewer flight options on Monday, 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 September.
The cheapest return price found within the last 5 days was £430 on Lufthansa (27 Sept–29 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 £419.

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

10,100 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

1,693 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

8,173 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

8,155 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 £362 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 £343. 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 City - 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 £1,512 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 £325.
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.

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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£362	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£396	Average£540	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Lufthansa	Cheapest£403	Average£562	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
British Airways	Cheapest£403	Average£554	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Air France	Cheapest£405	Average£645	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£598	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 £328

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 16/10. 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 10 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 10 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 10 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 10 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 10 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 10 August 2026.

Last-minute flights from London to Dulles IntlDiscover last-minute flight deals from London to Dulles Intl. Data last updated 10 August 2026 and is based on user searches.

Discover last-minute flight deals from London to Dulles Intl. Data last updated 10 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 10 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 10 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 10 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 10 August 2026.

The most flights from LON to IAD are scheduled on a Friday (29 on average). You will have fewer flight options on Monday, 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 September.The cheapest return price found within the last 5 days was £430 on Lufthansa (27 Sept–29 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 £419.

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 10 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 10 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 10 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 10 August 2026.

Last-minute flights from London to Dulles Intl
Discover last-minute flight deals from London to Dulles Intl. Data last updated 10 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 10 August 2026.

London to Washington, D.C. Dulles Intl Airport flights typically cost between £489 and £643 in September.
The cheapest return price found within the last 5 days was £430 on Lufthansa (27 Sept–29 Sept).