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Cheap flights from London to Washington, D.C. from £218

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to Washington, D.C. departing on 22/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap return flights

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TAP AIR PORTUGAL Logo
19:55 - 21:00LHR-IAD
30h 05m1 stop
TAP AIR PORTUGAL Logo
22:30 - 17:30IAD-LHR
14h 00m1 stop
£403TAP AIR PORTUGAL
Find Deal
Thu, 12 Feb - Sun, 22 Feb
Multiple Airlines Logo
14:00 - 07:45LGW-IAD
22h 45m1 stop
Multiple Airlines Logo
05:45 - 10:05IAD-LGW
23h 20m2 stops
£404Multiple Airlines
Find Deal
Fri, 21 Nov - Sat, 6 Dec
Icelandair Logo
09:20 - 18:53LHR-DCA
14h 33m1 stop
Icelandair Logo
06:15 - 20:45DCA-LHR
9h 30m1 stop
£418Icelandair
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Mon, 2 Feb - Mon, 9 Feb
Icelandair Logo
09:20 - 17:35LHR-DCA
13h 15m1 stop
Icelandair Logo
13:00 - 06:55DCA-LHR
12h 55m1 stop
£419Icelandair
Find Deal
Mon, 2 Feb - Mon, 9 Feb
JetBlue Logo
09:20 - 17:00LHR-DCA
12h 40m1 stop
JetBlue Logo
17:43 - 21:40DCA-LHR
22h 57m1 stop
£422JetBlue
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Wed, 19 Nov - Mon, 24 Nov
JetBlue Logo
07:25 - 22:59LHR-DCA
20h 34m1 stop
JetBlue Logo
15:09 - 06:55DCA-LHR
10h 46m1 stop
£423JetBlue
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Tue, 11 Nov - Tue, 18 Nov
Virgin Atlantic Logo
12:30 - 22:08LHR-BWI
14h 38m1 stop
Virgin Atlantic Logo
18:21 - 11:40BWI-LHR
12h 19m1 stop
£457Virgin Atlantic
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Fri, 5 Dec - Tue, 9 Dec
Virgin Atlantic Logo
13:00 - 23:03LHR-BWI
15h 03m1 stop
Virgin Atlantic Logo
16:49 - 09:00BWI-LHR
11h 11m1 stop
£458Virgin Atlantic
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Wed, 10 Dec - Wed, 17 Dec
British Airways Logo
11:20 - 21:59LGW-DCA
15h 39m1 stop
British Airways Logo
08:19 - 07:30DCA-LGW
18h 11m1 stop
£574British Airways
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Tue, 25 Nov - Mon, 1 Dec
British Airways Logo
11:20 - 21:59LGW-DCA
15h 39m1 stop
British Airways Logo
11:45 - 07:30DCA-LGW
14h 45m1 stop
£638British Airways
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Tue, 25 Nov - Tue, 2 Dec

Scandinavian Airlines flights from London to Washington, D.C.

Our best Scandinavian Airlines deals on London to Washington, D.C. flight tickets
Scandinavian Airlines
12 Mar
LHR10:20London Heathrow
11h 55m
1 stop
IAD18:15Washington, D.C. Dulles Intl
16 Mar
IAD21:30Washington, D.C. Dulles Intl
14h 55m
2 stops
LHR16:25London Heathrow
£434
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Scandinavian Airlines
2 Feb
LHR06:40London Heathrow
15h 35m
1 stop
IAD17:15Washington, D.C. Dulles Intl
9 Feb
IAD20:30Washington, D.C. Dulles Intl
31h 50m
1 stop
LHR09:20London Heathrow
£434
Find similar
Scandinavian Airlines
29 Jan
LHR10:20London Heathrow
11h 55m
1 stop
IAD17:15Washington, D.C. Dulles Intl
2 Feb
IAD20:30Washington, D.C. Dulles Intl
14h 30m
1 stop
LHR16:00London Heathrow
£435
Find similar

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

Our best Virgin Atlantic deals on London to Washington, D.C. flight tickets
Virgin Atlantic
5 Dec
LHR12:30London Heathrow
14h 38m
1 stop
BWI22:08Baltimore/Washington
9 Dec
BWI18:21Baltimore/Washington
12h 19m
1 stop
LHR11:40London Heathrow
£457
Find similar
Virgin Atlantic
10 Dec
LHR13:00London Heathrow
15h 03m
1 stop
BWI23:03Baltimore/Washington
17 Dec
BWI16:49Baltimore/Washington
11h 11m
1 stop
LHR09:00London Heathrow
£458
Find similar
Virgin Atlantic
8 Dec
LHR17:50London Heathrow
27h 15m
1 stop
IAD16:05Washington, D.C. Dulles Intl
10 Jan
IAD22:20Washington, D.C. Dulles Intl
7h 30m
LHR10:50London Heathrow
£461
Find similar

momondo Fare Finder

 
Customise 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, momondo users made 279,928 searches. Data last updated 28 October 2025.
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

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 12/2

19:55-21:00

1 stop30h 05m

Washington, D.C. Dulles Intl

Sun 22/2

22:30-17:30

1 stop14h 00m

£403

LondonWashington, D.C.

LGW - IAD

LGWIAD

London Gatwick

Fri 21/11

14:00-07:45

1 stop22h 45m

Washington, D.C. Dulles Intl

Sat 6/12

05:45-10:05

2 stops23h 20m

£404

LondonWashington, D.C.

LHR - DCA

LHRDCA

London Heathrow

Mon 2/2

09:20-18:53

1 stop14h 33m

Washington, D.C. Reagan-National

Mon 9/2

06:15-20:45

1 stop9h 30m

£418

LondonWashington, D.C.

LHR - DCA

LHRDCA

London Heathrow

Mon 2/2

09:20-17:35

1 stop13h 15m

Washington, D.C. Reagan-National

Mon 9/2

13:00-06:55

1 stop12h 55m

£419

LondonWashington, D.C.

LHR - DCA

LHRDCA

London Heathrow

Wed 19/11

09:20-17:00

1 stop12h 40m

Washington, D.C. Reagan-National

Mon 24/11

17:43-21:40

1 stop22h 57m

£422

LondonWashington, D.C.

LHR - DCA

LHRDCA

London Heathrow

Tue 11/11

07:25-22:59

1 stop20h 34m

Washington, D.C. Reagan-National

Tue 18/11

15:09-06:55

1 stop10h 46m

£423

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Fri 5/12

12:30-22:08

1 stop14h 38m

Baltimore/Washington

Tue 9/12

18:21-11:40

1 stop12h 19m

£457

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Wed 10/12

13:00-23:03

1 stop15h 03m

Baltimore/Washington

Wed 17/12

16:49-09:00

1 stop11h 11m

£458

LondonWashington, D.C.

LGW - DCA

LGWDCA

London Gatwick

Tue 25/11

11:20-21:59

1 stop15h 39m

Washington, D.C. Reagan-National

Mon 1/12

08:19-07:30

1 stop18h 11m

£574

LondonWashington, D.C.

LGW - DCA

LGWDCA

London Gatwick

Tue 25/11

11:20-21:59

1 stop15h 39m

Washington, D.C. Reagan-National

Tue 2/12

11:45-07:30

1 stop14h 45m

£638

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Washington, D.C. from

How to get the cheapest flight ticket from London to Washington, D.C.

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between London and Washington, D.C.?

What is the cheapest month to fly to Washington, D.C.?

The cheapest month to fly to Washington, D.C. from London is in February. Flight prices, which tend to average around £467, are often lower during this time because this is during the off-season. If you don’t want to visit Washington, D.C. in February, then you should wait until September to fly from London, when ticket prices are also cheap, with an average price of £480.

What is the cheapest day to depart on your flight to Washington, D.C.?

On average, the least expensive day to fly to Washington, D.C. from London is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as £606. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from London because it is more convenient for both business and leisure travellers. As a result, prices tend to be around £685.

What is the cheapest time of day to depart on your flight to Washington, D.C.?

In the evening is the cheapest time of day to fly from London to Washington, D.C. when you can find flight prices for as low as £515. Flying to Washington, D.C. in the evening is an ideal time because this is during off-peak travel hours. Flights to Washington, D.C. are more costly in the afternoon, with an average ticket price of £638. Departure times in the afternoon fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest London to Washington, D.C. flight route?

Fly from London Heathrow to Baltimore/Washington for the best London - Washington, D.C. flight prices

How far in advance should I book a flight to Washington, D.C.?

You are more likely to see cheaper flights to Washington, D.C. from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. for around £587 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. from London for as low as £553 on momondo.

What cabin class options are available on London to Washington, D.C. flights?

There are 4 cabin classes available to choose from on London to Washington, D.C. flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on London to Washington, D.C. flights?

You could potentially save up to 28% on your flight if you consider stops on a London to Washington, D.C. flight.

How have London to Washington, D.C. flight prices changed over time?

As of October 2025, prices for London to Washington, D.C. flights are approximately 137% more expensive when compared to flights at the same time last year.

When to book flights from London to Washington, D.C.

Are you open to changing your travel dates? Check out the ideal times to fly from London to Washington, D.C. according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap London to Washington, D.C. (LON to WAS) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London to Washington, D.C.

Best price found

£422

Fastest flight time

8h 05m

Direct flights

Mon, Wed, Thu, Fri, Sat and Sun

Airports in Washington, D.C.

2 airports
The best one-way flight to Washington, D.C. from London in the past 72 hours is £422. The best return flight deal from London to Washington, D.C. found on momondo in the last 72 hours is £519.
The fastest flight from London to Washington, D.C. takes 8h 05m
Direct flights go from London to Washington, D.C. on Monday, Wednesday, Thursday, Friday, Saturday and Sunday. There are no airlines offering direct flights..
There are 2 airports near Washington, D.C.: Baltimore/Washington (BWI), Washington, D.C. Dulles Intl (IAD)
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  • How far is London to Washington, D.C. by plane?

    The distance between London and Washington, D.C. is about 3662.3 mi. 11h 05m is a normal flight duration for this route.

  • When did momondo last update prices for flights from London to Washington, D.C.?

    Prices for flights from London to Washington, D.C. were last updated today.

  • How many operators does momondo search for flights from London to Washington, D.C.?

  • How old do you have to be to fly from London to Washington, D.C.?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London to Washington, D.C..

  • What documentation or ID do you need to fly to Washington, D.C.?

    The required travel and health documents for your Washington, D.C. trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Washington, D.C.. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from London to Washington, D.C.?

  • What is the most popular airline from London to Washington, D.C.?

Best airlines flying from London to Washington, D.C.

Compare and see reviews for airlines that fly from London to Washington, D.C. with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom £190Free CancellationRating
7.9
7,994 reviews
Search Delta flights
PLAYPriceFrom £269Free CancellationRating
7.0
103 reviews
Search PLAY flights
IcelandairPriceFrom £348Free CancellationRating
7.1
562 reviews
Search Icelandair flights
TAP AIR PORTUGALPriceFrom £356Free CancellationRating
7.1
2,033 reviews
Search TAP AIR PORTUGAL flights
JetBluePriceFrom £384Free CancellationRating
7.2
2,907 reviews
Search JetBlue flights
Aer LingusPriceFrom £390Free CancellationRating
7.2
1,360 reviews
Search Aer Lingus flights
United AirlinesPriceFrom £408Free CancellationRating
7.4
8,996 reviews
Search United Airlines flights
LufthansaPriceFrom £423Free CancellationRating
6.8
7,532 reviews
Search Lufthansa flights
FinnairPriceFrom £425Free CancellationRating
7.6
1,333 reviews
Search Finnair flights
Scandinavian AirlinesPriceFrom £435Free CancellationRating
7.4
1,543 reviews
Search Scandinavian Airlines flights

  • Delta Flights From London to Washington, D.C.

    Delta flight deals from London to Washington, D.C. start from £190 round-trip. Over the 6 Delta flights for this route in a normal week, average airfare is usually £521 round-trip - but some users have found much cheaper deals with momondo.

  • KLM Flights From London to Washington, D.C.

    KLM (7.7/10 from 1,406 reviews) operates around 6 flights from London to Washington, D.C. in any given week. The average KLM airfare for this route is around £628, with deals from around £440 rare but found on momondo. Referenced prices are for round-trip London to Washington, D.C. flight searches in the last 72 hours.

Travelling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Laurel
College Park
Alexandria
Fairfax
Linthicum Heights
Bethesda
Gettysburg
Cambridge
Ellicott City
Westminster
Arlington
Woodbridge
Owings Mills
Silver Spring
National Harbor

Why use momondo?

Why should I use momondo to find a flight deal from London to Washington, D.C.?

Finding the right flight to Washington, D.C. from London is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Washington, D.C. quick and easy, saving you time and money.

Can I find flights from London to Washington, D.C. with flexible booking policies on momondo?

All flight searches from London to Washington, D.C. on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from London to Washington, D.C.?

Once you have performed a search for London to Washington, D.C. flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from London to Washington, D.C. right now. Can momondo alert me if prices change?

Yes. momondo can track prices for London to Washington, D.C. flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your Washington, D.C. trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
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Find better results for your trip to the United States

Fly into one of these airports located in Washington, D.C.

Airports listed have a maximum distance of 22.4 mi from Washington, D.C.
Washington, D.C. Reagan-National Airport
Washington, D.C. Dulles Intl Airport