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Cheap flights from London to Washington, D.C. Dulles Intl Airport from £412

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 25/6. Fares are subject to change and may not be available on all flights or dates of travel.
LON — IAD
14 Jun — 21 Jun1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London to Washington, D.C. Dulles Intl are usually found in September or March, booked 86 days in advance, depart on a Wednesday or Thursday and return on a Tuesday

Cheap flight deals from London to Dulles Intl

Enter your travel dates to find the best prices.

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 15 May 2026.

Thu 8/1021:25
LHR
-
IAD
1 stop26h 55m
Icelandair
Sun 11/1023:20
IAD
-
LHR
1 stop16h 00m
Icelandair
Deal found 11/5£452
Tue 2/607:10
STN
-
IAD
2 stops17h 10m
Multiple Airlines
Tue 9/620:30
IAD
-
STN
2 stops22h 40m
Multiple Airlines
Deal found 12/5£455
Tue 10/1106:00
LHR
-
IAD
1 stop13h 45m
TAP AIR PORTUGAL
Tue 24/1117:25
IAD
-
LHR
1 stop14h 15m
TAP AIR PORTUGAL
Deal found 12/5£456
Thu 24/913:05
LHR
-
IAD
1 stop11h 15m
Icelandair
Sat 10/1020:30
IAD
-
LHR
1 stop10h 25m
Icelandair
Deal found 11/5£457
Wed 7/1013:05
LHR
-
IAD
1 stop14h 10m
Icelandair
Mon 12/1020:30
IAD
-
LHR
1 stop18h 50m
Icelandair
Deal found 13/5£458
Wed 16/915:40
LGW
-
IAD
1 stop32h 40m
Icelandair
Wed 30/923:20
IAD
-
LGW
1 stop10h 20m
Icelandair
Deal found 12/5£458
Tue 21/709:30
LHR
-
IAD
1 stop12h 02m
United Airlines
Thu 6/813:15
IAD
-
LHR
1 stop14h 15m
United Airlines
Deal found 12/5£458
Tue 15/915:40
LGW
-
IAD
1 stop11h 35m
Icelandair
Fri 25/923:20
IAD
-
LGW
1 stop10h 20m
Icelandair
Deal found 13/5£458
Tue 15/913:05
LHR
-
IAD
1 stop14h 10m
Icelandair
Fri 25/923:20
IAD
-
LHR
1 stop16h 00m
Icelandair
Deal found 13/5£459
Wed 7/1015:40
LGW
-
IAD
1 stop11h 35m
Icelandair
Mon 12/1020:30
IAD
-
LGW
1 stop13h 10m
Icelandair
Deal found 12/5£459
Thu 8/1015:40
LGW
-
IAD
1 stop32h 40m
Icelandair
Tue 13/1020:30
IAD
-
LGW
1 stop13h 10m
Icelandair
Deal found 12/5£460
Thu 24/915:40
LGW
-
IAD
1 stop32h 40m
Icelandair
Thu 1/1020:30
IAD
-
LGW
1 stop13h 10m
Icelandair
Deal found 13/5£461

Find flight deals from London to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from London (LON) to Dulles Intl (IAD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 15 May 2026.

Round-trip from

£452

One-way from

£412

Popular in

July

Cheapest in

September

Average price

£560

Good round-trip deal

£543 or less

Good one-way deal

£631 or less
Icelandair
  • Icelandair
  • 8/10-11/10
  • 2 total stops
  • 42h 55m total
  • London to Washington, D.C.
Search Deals
25/6
  • 25/6
  • 2 total stops
  • 33h 41m total
  • London to Washington, D.C.
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (£35 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£5 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 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

 
Customise your flight search to find flights from London to Dulles Intl that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 15 May 2026.
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.

LTN - IAD

LTNIAD

London Luton

Wed 17/6

06:15-20:29

2 stops19h 14m

Washington, D.C. Dulles Intl

Mon 22/6

08:18-22:50

3 stops33h 32m

£504

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 24/6

21:25-19:20

1 stop26h 55m

Washington, D.C. Dulles Intl

Fri 2/10

20:30-20:20

1 stop18h 50m

£507

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Tue 27/10

09:05-15:10

1 stop34h 05m

Washington, D.C. Dulles Intl

Sun 8/11

22:15-10:50

Nonstop7h 35m

£515

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 29/10

09:50-20:30

1 stop14h 40m

Washington, D.C. Dulles Intl

Thu 5/11

20:09-11:40

1 stop10h 31m

£522
Fastest return journey

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 24/9

17:55-20:55

Nonstop8h 00m

Washington, D.C. Dulles Intl

Sat 10/10

22:55-11:20

Nonstop7h 25m

£533

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 31/8

17:55-20:55

Nonstop8h 00m

Washington, D.C. Dulles Intl

Mon 7/9

22:55-11:20

Nonstop7h 25m

£535

LondonWashington, D.C.

LGW - IAD

LGWIAD

London Gatwick

Wed 22/7

10:25-19:35

1 stop14h 10m

Washington, D.C. Dulles Intl

Wed 5/8

18:15-09:25

1 stop10h 10m

£539

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sun 30/8

17:55-20:55

Nonstop8h 00m

Washington, D.C. Dulles Intl

Wed 9/9

22:55-11:20

Nonstop7h 25m

£541

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 20/7

17:05-20:20

Nonstop8h 15m

Washington, D.C. Dulles Intl

Wed 29/7

22:25-10:50

Nonstop7h 25m

£544

LondonWashington, D.C.

LGW - IAD

LGWIAD

London Gatwick

Sat 19/9

10:25-19:35

1 stop14h 10m

Washington, D.C. Dulles Intl

Tue 22/9

18:15-09:25

1 stop10h 10m

£552

Flights are sorted by cheapest return flights first.

Deals found on 10/5

Showing 1-10 of 60 resultsSorted by cheapest first
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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.
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

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 63 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.

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

Currently, January is the cheapest month in which you can book a flight from London to Washington, D.C. Dulles Intl Airport (average of £320). Flying from London to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of £938). 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?

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 15 May 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 15 May 2026.

The most flights from LON to IAD are scheduled on a Monday (28 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (24 on average).

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

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.

Reykjavik (KEF) – chosen by Cheapflights users on 35% 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.

Madrid (MAD) is the most affordable one-stop option, with an average return flight price of £429.

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 Brussels (BRU) have the shortest average one-way travel time for one-stop routes: 11h 13m.

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 Amsterdam (AMS) offer the fastest connection on this route, with an average stopover time of 1h 18m.

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

About 18% of weekly flights between London and Washington, D.C. have experienced delays in the past year, with the average delay time being 127 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, Virgin Atlantic have had the lowest number of delays on this route, with just 11% of flights being delayed.

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Dulles Intl. Reviews last updated 15 May 2026.
Read through reviews of airlines operating flights from London to Washington, D.C. Dulles Intl Airport, such as United Airlines,Virgin Atlantic, andIcelandair. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,717 reviews
Check prices

Comfort

7.3

Overall

7.4

Entertainment

7.1

Boarding

7.7

Food

6.6

Crew

8.1

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
United Airlines
7.4
Good
9,717 reviews
United Airlines
7.4
Good
9,717 reviews
Check prices

Comfort

7.3

Overall

7.4

Entertainment

7.1

Boarding

7.7

Food

6.6

Crew

8.1

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
Virgin Atlantic
7.4
Good
688 reviews
United Airlines
7.4
Good
9,717 reviews
Check prices

Comfort

7.3

Overall

7.4

Entertainment

7.1

Boarding

7.7

Food

6.6

Crew

8.1

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
Icelandair
7.0
Good
654 reviews
United Airlines
7.4
Good
9,717 reviews
Check prices

Comfort

7.3

Overall

7.4

Entertainment

7.1

Boarding

7.7

Food

6.6

Crew

8.1

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
Lufthansa
6.8
Okay
8,002 reviews
United Airlines
7.4
Good
9,717 reviews
Check prices

Comfort

7.3

Overall

7.4

Entertainment

7.1

Boarding

7.7

Food

6.6

Crew

8.1

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
British Airways
6.7
Okay
7,980 reviews
United Airlines
7.4
Good
9,717 reviews
Check prices

Comfort

7.3

Overall

7.4

Entertainment

7.1

Boarding

7.7

Food

6.6

Crew

8.1

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.

Related info for your journey

Find useful and relevant information for your journey from London to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

    For as low as £522, Icelandair can have you in Washington, D.C. Dulles Intl Airport from London in 14h 40m. 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 Delta. Our recent data shows that you can find tickets from as low as £294 on this airline. Additional options worth looking into are TAP AIR PORTUGAL and Icelandair, starting at £330 and £331 round-trip. Users have found that Delta is 45% 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 TAP AIR PORTUGAL, with whom users have recently found tickets for as low as £346. 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 (86%), Austrian Airlines (86%), Copa Airlines( 86%).

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

    On average you can expect to pay £954 for a flight from London to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is £479 while the most popular route, (London Heathrow - Washington, D.C. Dulles Intl) is currently priced at £377.

  • 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, January is the cheapest month in which you can book a flight from London to Washington, D.C. Dulles Intl Airport (average of £320). Flying from London to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of £938). 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

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

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Silver Spring
Hanover
Oxon Hill
Gaithersburg
Woodbridge
Arlington
Alexandria
Sterling

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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 15 May 2026.
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

Discover the top 10 airlines that operate flights from London to Dulles Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 15 May 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest£294Average£535FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
TAP AIR PORTUGALCheapest£330Average£403FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
IcelandairCheapest£331Average£505FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£362Average£563FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
LufthansaCheapest£401Average£577FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Virgin AtlanticCheapest£407Average£548FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£409Average£560FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Scandinavian AirlinesCheapest£415Average£597FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Austrian AirlinesCheapest£416Average£570FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
FinnairCheapest£416Average£606FlexibilityNo cancel feeOn-time76%
Search Finnair flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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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