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Washington, D.C.

$334+ Cheap flights from London (LON) to Washington, D.C. (WAS)

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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
LON — WAS
May 27 — Jun 31
Wed 5/27
Wed 6/3
1 adult, Economy
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1. Tell us where you want to go

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Cheapflights Tip: The best prices from London to Washington, D.C. are usually found in February or January, booked 57 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

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

Cheapest flights from London to Washington, D.C.
Explore the most affordable flight options available from London to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 27, 2026.

This deal was found by Cheapflights users on 4/24. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/222:00 pm
LHR
-
IAD
Nonstop8h 25m
British Airways
Tue 6/95:40 pm
IAD
-
LHR
Nonstop7h 40m
British Airways
Deal found 4/24$567
This deal was found by Cheapflights users on 4/22. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/2611:45 am
LHR
-
IAD
1 stop12h 33m
Delta
Sun 7/127:21 pm
IAD
-
LHR
1 stop12h 54m
Delta
Deal found 4/22$568
This deal was found by Cheapflights users on 4/24. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/55:05 pm
LHR
-
IAD
Nonstop8h 15m
British Airways
Tue 6/97:20 pm
IAD
-
LHR
Nonstop7h 25m
British Airways
Deal found 4/24$569
This deal was found by Cheapflights users on 4/24. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/243:15 pm
LHR
-
IAD
1 stop14h 36m
Delta
Fri 6/57:38 pm
IAD
-
LHR
1 stop12h 37m
Delta
Deal found 4/24$570
This United Airlines deal was found by Cheapflights users on 4/24. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/302:10 pm
LHR
-
IAD
1 stop22h 34m
United Airlines
Sun 5/3110:29 pm
IAD
-
LHR
1 stop18h 06m
United Airlines
Deal found 4/24$571
This deal was found by Cheapflights users on 4/27. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2110:45 am
LHR
-
DCA
1 stop13h 33m
Delta
Mon 9/2110:00 am
DCA
-
LHR
1 stop15h 25m
Delta
Deal found 4/27$571
This Gotogate deal was found by Cheapflights users on 4/24. 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 10/71:05 pm
LHR
-
IAD
1 stop14h 10m
Icelandair
Sun 10/118:30 pm
IAD
-
LHR
1 stop10h 25m
Icelandair
Deal found 4/24$574
This Gotogate deal was found by Cheapflights users on 4/24. 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 10/73:40 pm
LGW
-
IAD
1 stop11h 35m
Icelandair
Sun 10/118:30 pm
IAD
-
LGW
1 stop13h 10m
Icelandair
Deal found 4/24$574
This deal was found by Cheapflights users on 4/27. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1712:15 pm
LHR
-
IAD
Nonstop8h 15m
United Airlines
Wed 9/166:15 am
IAD
-
LHR
1 stop10h 10m
United Airlines
Deal found 4/27$575
This The Travel House deal was found by Cheapflights users on 4/24. 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 The Travel House is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/2411:55 am
LGW
-
IAD
1 stop11h 35m
Icelandair
Sun 11/297:40 pm
IAD
-
LGW
1 stop10h 15m
Icelandair
Deal found 4/24$576
This deal was found by Cheapflights users on 4/27. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/202:00 pm
LHR
-
IAD
Nonstop8h 25m
British Airways
Sun 9/205:45 pm
IAD
-
LHR
Nonstop7h 35m
British Airways
Deal found 4/27$578
This deal was found by Cheapflights users on 4/27. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1812:00 pm
LHR
-
IAD
1 stop14h 09m
United Airlines
Fri 9/186:15 am
IAD
-
LHR
1 stop10h 10m
United Airlines
Deal found 4/27$579

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

Discover tips and strategies to find the most affordable flight options for your journey from London (LON) to Washington, D.C. (WAS). 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 April 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$563

One-way from

$334
(Kiwi.com)

Popular in

July

Cheapest in

February

Average price

$712

Good round-trip deal

$707 or less

Good one-way deal

$778 or less
Provider with most accurate pricing for London (LON)-Washington, D.C. (WAS) flight deals.
Search Deals
Provider most trusted by Cheapflights users for London (LON)-Washington, D.C. (WAS) flights.
Search Deals
From London (LON) to Washington, D.C. (WAS)
Search Deals
One-way flight from London (LON) to Washington, D.C. (WAS)
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($82 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals
Price to beat on a round-trip flight from London (LON) to Washington, D.C. (WAS).
Search Deals
Price to beat on a one-way flight from London (LON) to Washington, D.C. (WAS).
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from London to Washington, D.C. 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 April 27, 2026.
Use the filters below to find and compare flights from London to Washington, D.C. that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonWashington, D.C.

LGW - IAD

LGWIAD

London Gatwick

Wed 10/7

3:40 pm-7:20 pm

1 stop32h 40m

Washington, D.C. Dulles Intl

Mon 10/12

8:30 pm-2:40 pm

1 stop13h 10m

$620

LondonWashington, D.C.

LGW - IAD

LGWIAD

London Gatwick

Tue 9/1

1:00 pm-7:20 pm

1 stop11h 20m

Washington, D.C. Dulles Intl

Mon 9/14

8:30 pm-2:40 pm

1 stop13h 10m

$635

LondonWashington, D.C.

LGW - IAD

LGWIAD

London Gatwick

Thu 5/7

1:00 pm-7:20 pm

1 stop11h 20m

Washington, D.C. Dulles Intl

Sun 5/24

11:20 pm-2:40 pm

1 stop10h 20m

$642

LondonWashington, D.C.

LGW - IAD

LGWIAD

London Gatwick

Fri 8/28

3:40 pm-10:15 pm

1 stop11h 35m

Washington, D.C. Dulles Intl

Fri 9/11

11:20 pm-11:45 am

1 stop31h 25m

$644

LondonBaltimore

STN - BWI

STNBWI

London Stansted

Mon 5/11

8:30 am-7:25 pm

2 stops15h 55m

Baltimore/Washington

Mon 5/25

8:30 pm-7:25 pm

2 stops17h 55m

$654

LondonBaltimore

STN - BWI

STNBWI

London Stansted

Tue 6/2

12:45 pm-10:15 pm

2 stops14h 30m

Baltimore/Washington

Tue 6/9

11:20 pm-12:10 am

2 stops19h 50m

$673

LondonWashington, D.C.

LTN - IAD

LTNIAD

London Luton

Fri 5/8

6:20 am-7:25 pm

1 stop18h 05m

Washington, D.C. Dulles Intl

Mon 5/11

8:55 pm-3:45 pm

1 stop13h 50m

$687

LondonBaltimore

STN - BWI

STNBWI

London Stansted

Mon 5/4

6:30 am-7:25 pm

2 stops17h 55m

Baltimore/Washington

Mon 5/11

8:30 pm-9:20 pm

2 stops19h 50m

$702

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Thu 7/23

4:25 pm-7:40 pm

Nonstop8h 15m

Baltimore/Washington

Thu 8/20

1:54 pm-6:55 am

1 stop12h 01m

$712

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 6/11

6:30 am-3:35 pm

1 stop14h 05m

Washington, D.C. Dulles Intl

Mon 6/15

10:55 pm-11:20 am

Nonstop7h 25m

$713

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/22

Showing 1-10 of 60 resultsSorted by cheapest first
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Compare providers for flights from London to Washington, D.C.

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from London to Washington, D.C. in April.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
Thrive TravelPrice Accuracy3 starsTrust Score*2 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy2 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*1 star
Trip.comPrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on London-Washington, D.C. flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London-Washington, D.C. flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London-Washington, D.C. flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on London-Washington, D.C. flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London-Washington, D.C. flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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

Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. from London 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 London to Washington, D.C.

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

To ensure you get the cheapest price possible for a flight from London to Washington, D.C., you should look to book at least 68 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, March is the cheapest month in which you can book a flight from London to Washington, D.C. (average of $642). Flying from London to Washington, D.C. in December is currently the most expensive (average of $843). 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 WAS?

Find hourly flight availability from London to Washington, D.C.. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 27, 2026.

When flying from London to Washington, D.C., 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.

Explore weekly flight availability from London to Washington, D.C.. 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 April 27, 2026.

The most flights from LON to WAS are scheduled on a Monday (28 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (26 on average).

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

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

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

Dublin (DUB) – chosen by Cheapflights users on 50% of 1-stop itineraries from London to Washington, D.C. on Cheapflights.

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

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

Lisbon (LIS) is the most affordable 1-stop option, with an average round-trip price of $509.

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

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

Flights via Dublin (DUB) have the shortest average one-way travel time for 1-stop routes: 11h 05m.

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

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

Flights via Lisbon (LIS) offer the fastest connection on this route, with an average layover time of 1h 23m.

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 126 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 last year, Virgin Atlantic have had the lowest number of delays on this route, with just 11% of flights being delayed.

The best insider tips for London to Washington, D.C. flights

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your London to Washington, D.C. trip
Our travel experts
Gabriel Leigh

Gabriel Leigh

Expert on British Airways

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Read more
Harriet Baskas

Harriet Baskas

Expert on United Airlines

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on LHR and IAD

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

Reviews of airlines servicing Washington, D.C.

Get insights into the airlines that provide service to Washington, D.C.. 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 Washington, D.C.. Reviews last updated April 27, 2026.
Read through reviews of airlines operating flights from London to Washington, D.C., such as Delta,United Airlines, andVirgin Atlantic. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,462 reviews

Comfort

7.9

Food

7.2

Crew

8.5

Overall

7.9

Boarding

8.1

Entertainment

7.8

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,462 reviews
Delta
7.9
Good
8,462 reviews

Comfort

7.9

Food

7.2

Crew

8.5

Overall

7.9

Boarding

8.1

Entertainment

7.8

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,667 reviews
Delta
7.9
Good
8,462 reviews

Comfort

7.9

Food

7.2

Crew

8.5

Overall

7.9

Boarding

8.1

Entertainment

7.8

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Virgin Atlantic
7.4
Good
688 reviews
Delta
7.9
Good
8,462 reviews

Comfort

7.9

Food

7.2

Crew

8.5

Overall

7.9

Boarding

8.1

Entertainment

7.8

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
American Airlines
7.1
Good
11,667 reviews
Delta
7.9
Good
8,462 reviews

Comfort

7.9

Food

7.2

Crew

8.5

Overall

7.9

Boarding

8.1

Entertainment

7.8

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
British Airways
6.7
Okay
7,916 reviews
Delta
7.9
Good
8,462 reviews

Comfort

7.9

Food

7.2

Crew

8.5

Overall

7.9

Boarding

8.1

Entertainment

7.8

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Related info for your journey

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

    For as low as $712, Icelandair can have you in Washington, D.C. from London in 8h 15m. The distance from London to Washington, D.C. is about 3622 mi. This flight may include one or multiple stops.

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

    Flying on Delta is currently your cheapest option to Washington, D.C., with prices starting at $320. Additional round-trip tickets that might be worth considering are offered by Icelandair and TAP AIR PORTUGAL, with the lowest prices starting at $466 and $473, respectively. These flights start at 54% lower than the current average price 3 months from now.

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

    One-way options have recently been found by users for as low as $453 on TAP AIR PORTUGAL. Other airlines that offer cheap prices include JetBlue from $455 and Virgin Atlantic from $485 one-way.

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

    While some choose either London Heathrow - Baltimore/Washington or London Gatwick - Washington, D.C. Dulles Intl, London Heathrow - Washington, D.C. Dulles Intl is the most popular route from London to Washington, D.C..

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

    Before booking your flight to Washington, D.C. from London, check out the most reliable airlines to get you to your destination on time: Air Canada (87%), Austrian Airlines (87%), Copa Airlines( 87%).

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

    Looking at all options, your cheapest flight can be booked for $670. While the most popular route (London Heathrow - Washington, D.C. Dulles Intl) can be booked for $575 on average, our data indicates $1,566 when flying from London to Washington, D.C..

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

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

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

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

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

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

    Currently, March is the cheapest month in which you can book a flight from London to Washington, D.C. (average of $642). Flying from London to Washington, D.C. in December is currently the most expensive (average of $843). 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 Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Alexandria
Tysons
Owings Mills
Springfield
Arlington
Silver Spring
Herndon
Rockville
Hyattsville
Manassas
Fredericksburg
Woodbridge
Hanover
Laurel
Largo
Upper Marlboro
Waldorf
Clinton
Hunt Valley
Cordova

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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

Discover the top 10 airlines that operate flights from London to Washington, D.C.. 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 April 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$320Average$909FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$466Average$665FlexibilityNo cancel feeOn-time76%
TAP AIR PORTUGALCheapest$473Average$730FlexibilityNo cancel feeOn-timeN/A
Austrian AirlinesCheapest$534Average$743FlexibilityNo cancel feeOn-time78%
LufthansaCheapest$536Average$742FlexibilityNo cancel feeOn-time76%
American AirlinesCheapest$559Average$796FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$567Average$810FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$571Average$823FlexibilityNo cancel feeOn-time70%
Air CanadaCheapest$635Average$663FlexibilityNo cancel feeOn-time67%
Aer LingusCheapest$658Average$786FlexibilityNo cancel feeOn-timeN/A

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