London

$170+ Cheap flights from Washington, D.C. (WAS) to London (LON)

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 10/7. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — LON
Oct 19 — Oct 261
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Cheapflights Tip: The best prices from Washington, D.C. to London are usually found in September or January, booked 70 days in advance, depart on a Wednesday or Tuesday and return on a Thursday

Cheap flight deals from Washington, D.C. to London

Discover tips and strategies to find the most affordable flight options for your journey from Washington, D.C. (WAS) to London (LON). 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 September 19, 2025.

Round-trip from

$490
(Mytrip)

One-way from

$170
(Trip.com)

Popular in

June

Cheapest in

September

Average price

$636

Good round-trip deal

$648 or less

Good one-way deal

$384 or less
From Washington, D.C. (WAS) to London (LON)
One-way flight from Washington, D.C. (WAS) to London (LON)
Highest demand for flights based on searches. 11% potential increase in price ($98 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease ($20 potential savings vs. average RT price).
Average for round-trip flights in September 2025
Price to beat on a round-trip flight from Washington, D.C. (WAS) to London (LON).
Price to beat on a one-way flight from Washington, D.C. (WAS) to London (LON).

Find flight deals from Washington, D.C. to London

Cheapest flights from Washington, D.C. to London
Explore the most affordable flight options available from Washington, D.C. to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 19, 2025.

This FlightHub deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/128:30 pmIAD - LHR
2 stops35h 25mScandinavian Airlines
Sat 11/156:40 amLHR - IAD
2 stops17h 10mScandinavian Airlines
Deal found 9/16$488
This Mytrip deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2811:15 pmIAD - LHR
1 stop31h 40mIcelandair
Tue 10/71:05 pmLHR - IAD
1 stop11h 15mIcelandair
Deal found 9/16$489
This Mytrip deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/511:15 pmIAD - LHR
1 stop16h 05mIcelandair
Tue 10/149:25 pmLHR - IAD
1 stop26h 55mIcelandair
Deal found 9/16$490
This oojo deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/148:30 pmIAD - LGW
1 stop13h 10mIcelandair
Fri 11/1411:55 amLGW - IAD
1 stop11h 35mIcelandair
Deal found 9/16$492
This oojo deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/311:15 pmIAD - LGW
1 stop10h 25mIcelandair
Fri 10/103:40 pmLGW - IAD
1 stop11h 30mIcelandair
Deal found 9/15$493
This Gotogate deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/18:30 pmIAD - LHR
1 stop10h 25mIcelandair
Fri 10/318:35 pmLHR - IAD
1 stop26h 55mIcelandair
Deal found 9/16$493
This oojo deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/111:15 pmIAD - LGW
1 stop10h 25mIcelandair
Wed 10/153:40 pmLGW - IAD
1 stop11h 30mIcelandair
Deal found 9/16$494
This FlightHub deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1111:15 pmIAD - LGW
1 stop10h 20mIcelandair
Wed 10/153:40 pmLGW - IAD
1 stop11h 30mIcelandair
Deal found 9/15$496
This Gotogate deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/238:30 pmIAD - LHR
1 stop10h 25mIcelandair
Tue 10/79:25 pmLHR - IAD
1 stop26h 55mIcelandair
Deal found 9/16$496
This oojo deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/68:30 pmIAD - LHR
1 stop10h 25mIcelandair
Wed 10/151:05 pmLHR - IAD
1 stop11h 15mIcelandair
Deal found 9/16$497
This FlightHub deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1211:15 pmIAD - LGW
1 stop10h 25mIcelandair
Mon 10/203:40 pmLGW - IAD
1 stop32h 40mIcelandair
Deal found 9/16$498
This oojo deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/107:40 pmIAD - LHR
1 stop10h 10mIcelandair
Mon 11/1712:15 pmLHR - IAD
1 stop11h 15mIcelandair
Deal found 9/16$498

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington, D.C. to London 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 2,558,603 searches. Data last updated September 19, 2025.
Use the filters below to find and compare flights from Washington, D.C. to London that are best for you.

Fly from

Washington, D.C.

Fly to

London

Route

Depart

Return

Price

Washington, D.C.London

IAD - LTN

IADLTN

Washington, D.C. Dulles Intl

Wed 11/12

7:40 pm-8:50 pm

1 stop20h 10m

London Luton

Mon 11/17

8:00 am-6:30 pm

1 stop15h 30m

$510

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Mon 11/10

7:40 pm-10:55 am

1 stop10h 15m

London Gatwick

Fri 11/14

11:55 am-6:30 pm

1 stop11h 35m

$518

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Tue 11/4

7:40 pm-10:55 am

1 stop10h 15m

London Gatwick

Mon 11/10

11:55 am-6:30 pm

1 stop11h 35m

$518

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Sun 12/7

7:40 pm-10:55 am

1 stop10h 15m

London Gatwick

Thu 12/11

11:55 am-6:30 pm

1 stop11h 35m

$519

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Tue 10/21

8:30 pm-2:40 pm

1 stop13h 10m

London Gatwick

Sat 11/22

11:55 am-6:30 pm

1 stop11h 35m

$519

Washington, D.C.London

IAD - LGW

IADLGW

Washington, D.C. Dulles Intl

Mon 11/24

7:40 pm-10:55 am

1 stop10h 15m

London Gatwick

Wed 12/3

11:55 am-6:30 pm

1 stop11h 35m

$519

Washington, D.C.London

IAD - STN

IADSTN

Washington, D.C. Dulles Intl

Thu 10/16

10:20 pm-9:55 pm

2 stops18h 35m

London Stansted

Thu 10/23

8:20 am-3:20 pm

2 stops36h 00m

$521

Washington, D.C.London

IAD - STN

IADSTN

Washington, D.C. Dulles Intl

Thu 12/4

7:40 pm-4:35 pm

2 stops15h 55m

London Stansted

Mon 12/8

6:30 am-6:30 pm

2 stops17h 00m

$528

Washington, D.C.London

IAD - STN

IADSTN

Washington, D.C. Dulles Intl

Mon 10/27

6:30 pm-1:55 pm

2 stops15h 25m

London Stansted

Wed 11/5

7:40 am-9:00 pm

2 stops18h 20m

$534

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 10/21

12:09 pm-9:35 am

2 stops16h 26m

London Heathrow

Fri 10/31

7:50 pm-7:50 pm

2 stops28h 00m

$563

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/18

Showing 1-10 of 60 results
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The best insider tips for Washington, D.C. to London flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. to London trip
Airports
IAD

Expect long security queues at IAD, especially in the afternoon and evening. Arrive early to navigate the check-in and security process smoothly.

Read more about IADby Ramsey Qubein
LHR

For a quick trip to central London, take the Heathrow Express to Paddington Station. It's the fastest option from LHR.

Read more about LHRby Ramsey Qubein
Our travel experts
Ramsey Qubein

Ramsey Qubein

Expert on LHR and IAD

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more

Best time to book a flight from Washington, D.C. to London

Have a flexible travel schedule? Discover the best time to fly to London from Washington, D.C. with our price prediction graph.
Estimated round-trip 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 Washington, D.C. to London

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

Use this chart to determine the optimal time to book a round-trip flight from Washington, D.C. to London. Price data was last updated on September 12, 2025.

The best time to book flights from Washington, D.C. to London is 70 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 Washington, D.C. to London?

Currently, November is the cheapest month in which you can book a flight from Washington, D.C. to London (average of $661). Flying from Washington, D.C. to London in June is currently the most expensive (average of $1,097). 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 WAS to LON?

Find hourly flight availability from Washington, D.C. to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 19, 2025.

A simple way to save on the total cost of your ticket is to fly from Washington, D.C. to London in the morning. If you’re flexible enough to do this you can expect to save up to 14% on your trip compared to booking a flight at noon.

What is the cheapest day to fly from Washington, D.C. to London?

Use this chart to determine the cheapest time to fly round-trip from Washington, D.C. to London. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Washington, D.C. to London flight should consider departing on Wednesday mornings when fares are most often at their lowest. Wednesday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Washington, D.C. to London

Explore weekly flight availability from Washington, D.C. to London. 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 September 19, 2025.

The most flights from WAS to LON are scheduled on a Wednesday (32 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (22 on average).

How much does it cost to fly round-trip from Washington, D.C. to London?

What’s the top layover airport for flights from Washington, D.C. to London?

Share of 1-stop round-trip flights from Washington, D.C. to London chosen by Cheapflights users in the past 12 months, using the same layover each way.

Reykjavik (KEF) – chosen by Cheapflights users on 75% of 1-stop itineraries from Washington, D.C. to London on Cheapflights.

What’s the cheapest layover airport for flights from Washington, D.C. to London?

Average round-trip fare for 1-stop flights from Washington, D.C. to London, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Dublin (DUB) is the most affordable 1-stop option, with an average round-trip price of $479.

What’s the fastest layover option from Washington, D.C. to London?

Shortest average travel time for 1-stop one-way flights from Washington, D.C. to London, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Montreal (YUL) have the shortest average one-way travel time for 1-stop routes: 9h 20m.

Which airport typically offers the quickest layover for flights from Washington, D.C. to London?

Average layover duration for 1-stop one-way flights from Washington, D.C. to London, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Reykjavik (KEF) offer the fastest connection on this route, with an average layover time of 1h 20m.

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. 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 London. Reviews last updated September 19, 2025.
See what other customers who have flown with United Airlines, Icelandair, and PLAY from Washington, D.C. to London have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Crew

8.1

Food

6.6

Boarding

7.7

Overall

7.4

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Julia,Sep 2025

BUF - DEN

The staff were amazing, from check in to boarding and on the flight. The range of entertainment options were really good as well.

Crew

8.1

Food

6.6

Boarding

7.7

Overall

7.4

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Julia,Sep 2025

BUF - DEN

The staff were amazing, from check in to boarding and on the flight. The range of entertainment options were really good as well.

Crew

8.1

Food

6.6

Boarding

7.7

Overall

7.4

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Julia,Sep 2025

BUF - DEN

The staff were amazing, from check in to boarding and on the flight. The range of entertainment options were really good as well.

Crew

8.1

Food

6.6

Boarding

7.7

Overall

7.4

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Julia,Sep 2025

BUF - DEN

The staff were amazing, from check in to boarding and on the flight. The range of entertainment options were really good as well.

Crew

8.1

Food

6.6

Boarding

7.7

Overall

7.4

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Julia,Sep 2025

BUF - DEN

The staff were amazing, from check in to boarding and on the flight. The range of entertainment options were really good as well.

Crew

8.1

Food

6.6

Boarding

7.7

Overall

7.4

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Julia,Sep 2025

BUF - DEN

The staff were amazing, from check in to boarding and on the flight. The range of entertainment options were really good as well.

Related info for your journey

Find useful and relevant information for your journey from Washington, D.C. to London. 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 Washington, D.C. to London?

    There are many flights that can get you from Washington, D.C. to London in 7h 15m. Fly via Icelandair, Scandinavian Airlines, or United Airlines to get the fastest option. Washington, D.C. and London are separated by a distance of 3664 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    Flying on JetBlue is currently your cheapest option to London, with prices starting at $31. Additional round-trip tickets that might be worth considering are offered by PLAY and Delta, with the lowest prices starting at $313 and $421, respectively. JetBlue is 95% cheaper than the average price of flights available within the next 90 days to this destination.

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

    $275 is the cheapest one-way deal found within the past few days, from TAP AIR PORTUGAL. You may also be able to find cheap deals on JetBlue and British Airways, with prices starting from $296 and $369, respectively.

  • What are the most popular routes from Washington, D.C. to London?

  • What are the most reliable airlines from Washington, D.C. to London?

    The top 3 most reliable airlines when flying from Washington, D.C. to London are Aeromexico (100%), KLM (80%) and Air France (80%).

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

    While on average a flight from Washington, D.C. to London is generally $1,998, our data shows the cheapest flight currently is $347. When looking at the most popular route, (Washington, D.C. Dulles Intl - London Heathrow), you can expect to pay $422 for that flight.

  • Where are the most common layover locations when flying from Washington, D.C. to London?

  • What are some popular things to do or see while on a layover in Reykjavik?

    The majority of Reykjavik visitors spend their time at Harpa, Hallgrímskirkja, and Laugardalslaug Geothermal Pool. Those on a layover in Reykjavik interested in visiting Harpa, Hallgrímskirkja, or Laugardalslaug Geothermal Pool can do so by traveling 23.3 mi, 23.2 mi, and 24.6 mi, respectively from Reykjavik Keflavik Intl. Travelers can book a car rental at Reykjavik Keflavik Intl for about $56 per day to make their sightseeing more efficient.

  • What are some popular points of interest to see during a layover in New York?

    Times Square, New York City Center, and Madison Square Garden are the most popular attractions in New York if you're in need of something to do during your layover. Travelers on a layover in New York can visit Times Square, New York City Center, and Madison Square Garden, by traveling 13.6 mi, 13.6 mi, and 13.6 mi, respectively after landing at New York John F Kennedy Intl. Travelers can book a car rental at New York John F Kennedy Intl for about $72 per day to make their sightseeing more efficient.

  • Where are the least popular layover locations for Washington, D.C. to London flights?

  • Can I find deals for flights from Washington, D.C. to London that include hotel bookings?

    Yes. In addition to deals on Washington, D.C. to London flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington, D.C. to London?

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

  • Can I find deals for business class flights from Washington, D.C. to London?

    Yes. Cheapflights offers flight deals from Washington, D.C. to London 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 Washington, D.C. to London?

    Currently, November is the cheapest month in which you can book a flight from Washington, D.C. to London (average of $661). Flying from Washington, D.C. to London in June is currently the most expensive (average of $1,097). 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

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Hayes
Southend-on-Sea
Harrow
Canterbury
Croydon
Eastleigh
Dartford
Dover
Winchester
Orpington
Gatwick
Borehamwood
Aylesbury
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Wembley
Folkestone
Chichester
Eastbourne
Sutton

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Top 10 airlines flying from Washington, D.C. to London

Discover the top 10 airlines that operate flights from Washington, D.C. to London. 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 2,558,603 searches. Data last updated September 19, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$31Average$806FlexibilityNo cancel feeOn-time62%
PLAYCheapest$313Average$486FlexibilityNo cancel feeOn-timeN/A
DeltaCheapest$421Average$797FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$424Average$597FlexibilityNo cancel feeOn-time77%
IcelandairCheapest$433Average$619FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$441Average$601FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$447Average$812FlexibilityNo cancel feeOn-time76%
Virgin AtlanticCheapest$497Average$851FlexibilityNo cancel feeOn-time72%
American AirlinesCheapest$497Average$854FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$506Average$858FlexibilityNo cancel feeOn-time69%

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