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Cheap flights from London to Washington, D.C. from £359

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 25/9. 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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Find the cheapest flights from London to Washington, D.C.

Cheap return flights

Logo
06:55 - 19:25LHR-IAD
17h 30m1 stop
Logo
17:37 - 06:30IAD-LHR
31h 53m1 stop
£392
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Fri, 26 Sep - Sat, 4 Oct
United Airlines Logo
09:00 - 17:40LHR-IAD
12h 40m1 stop
United Airlines Logo
17:33 - 09:10IAD-LHR
10h 37m1 stop
£394United Airlines
Find Deal
Tue, 28 Oct - Tue, 11 Nov
Virgin Atlantic Logo
08:40 - 23:03LHR-IAD
19h 23m2 stops
Virgin Atlantic Logo
10:08 - 06:45IAD-LHR
15h 37m2 stops
£394Virgin Atlantic
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Thu, 13 Nov - Thu, 18 Dec
Virgin Atlantic Logo
20:25 - 23:04LHR-DCA
31h 39m2 stops
Virgin Atlantic Logo
19:35 - 06:25DCA-LHR
29h 50m1 stop
£394Virgin Atlantic
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Wed, 19 Nov - Sun, 23 Nov
Icelandair Logo
11:55 - 18:40LGW-BWI
11h 45m1 stop
Icelandair Logo
19:40 - 10:55BWI-LGW
10h 15m1 stop
£394Icelandair
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Tue, 4 Nov - Mon, 10 Nov
Icelandair Logo
12:15 - 18:40LHR-BWI
11h 25m1 stop
Icelandair Logo
19:40 - 19:30BWI-LHR
18h 50m1 stop
£396Icelandair
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Sun, 7 Dec - Wed, 17 Dec
British Airways Logo
16:25 - 19:55LHR-IAD
8h 30mdirect
British Airways Logo
18:20 - 06:30IAD-LHR
7h 10mdirect
£400British Airways
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Fri, 21 Nov - Tue, 25 Nov
British Airways Logo
15:25 - 19:45LHR-BWI
8h 20mdirect
British Airways Logo
20:35 - 08:40BWI-LHR
7h 05mdirect
£400British Airways
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Tue, 28 Oct - Thu, 6 Nov
Lufthansa Logo
09:40 - 20:15LCY-IAD
15h 35m1 stop
Lufthansa Logo
22:00 - 17:40IAD-LCY
14h 40m1 stop
£423Lufthansa
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Thu, 6 Nov - Mon, 10 Nov
Lufthansa Logo
09:40 - 20:15LCY-IAD
15h 35m1 stop
Lufthansa Logo
23:00 - 16:40IAD-LCY
13h 40m1 stop
£424Lufthansa
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Thu, 5 Mar - Thu, 12 Mar

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

Our best Brussels Airlines deals on London to Washington, D.C. flight tickets
Brussels Airlines
18 Sept
LHR07:45London Heathrow
10h 45m
1 stop
IAD13:30Washington, D.C. Dulles Intl
2 Nov
IAD15:59Washington, D.C. Dulles Intl
36h 41m
1 stop
LHR09:40London Heathrow
£403
Find similar
Brussels Airlines
27 Oct
LHR17:50London Heathrow
25h 45m
1 stop
IAD15:35Washington, D.C. Dulles Intl
12 Dec
IAD17:15Washington, D.C. Dulles Intl
35h 25m
1 stop
LHR09:40London Heathrow
£413
Find similar

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

Our best United Airlines deals on London to Washington, D.C. flight tickets
United Airlines
28 Oct
LHR09:00London Heathrow
12h 40m
1 stop
IAD17:40Washington, D.C. Dulles Intl
11 Nov
IAD17:33Washington, D.C. Dulles Intl
10h 37m
1 stop
LHR09:10London Heathrow
£394
Find similar
United Airlines
30 Oct
LHR09:00London Heathrow
12h 40m
1 stop
IAD17:40Washington, D.C. Dulles Intl
9 Nov
IAD20:30Washington, D.C. Dulles Intl
11h 30m
1 stop
LHR13:00London Heathrow
£395
Find similar
United Airlines
29 Oct
LHR06:35London Heathrow
18h 30m
1 stop
IAD21:05Washington, D.C. Dulles Intl
17 Nov
IAD18:20Washington, D.C. Dulles Intl
7h 20m
LHR06:40London Heathrow
£396
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 12 September 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

Fri 26/9

06:55-19:25

1 stop17h 30m

Washington, D.C. Dulles Intl

Sat 4/10

17:37-06:30

1 stop31h 53m

£392

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Tue 28/10

09:00-17:40

1 stop12h 40m

Washington, D.C. Dulles Intl

Tue 11/11

17:33-09:10

1 stop10h 37m

£394

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 13/11

08:40-23:03

2 stops19h 23m

Washington, D.C. Dulles Intl

Thu 18/12

10:08-06:45

2 stops15h 37m

£394

LondonWashington, D.C.

LHR - DCA

LHRDCA

London Heathrow

Wed 19/11

20:25-23:04

2 stops31h 39m

Washington, D.C. Reagan-National

Sun 23/11

19:35-06:25

1 stop29h 50m

£394

LondonBaltimore

LGW - BWI

LGWBWI

London Gatwick

Tue 4/11

11:55-18:40

1 stop11h 45m

Baltimore/Washington

Mon 10/11

19:40-10:55

1 stop10h 15m

£394

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Sun 7/12

12:15-18:40

1 stop11h 25m

Baltimore/Washington

Wed 17/12

19:40-19:30

1 stop18h 50m

£396

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 21/11

16:25-19:55

Nonstop8h 30m

Washington, D.C. Dulles Intl

Tue 25/11

18:20-06:30

Nonstop7h 10m

£400

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Tue 28/10

15:25-19:45

Nonstop8h 20m

Baltimore/Washington

Thu 6/11

20:35-08:40

Nonstop7h 05m

£400

LondonWashington, D.C.

LCY - IAD

LCYIAD

London City

Thu 6/11

09:40-20:15

1 stop15h 35m

Washington, D.C. Dulles Intl

Mon 10/11

22:00-17:40

1 stop14h 40m

£423

LondonWashington, D.C.

LCY - IAD

LCYIAD

London City

Thu 5/3

09:40-20:15

1 stop15h 35m

Washington, D.C. Dulles Intl

Thu 12/3

23:00-16:40

1 stop13h 40m

£424

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 £459, 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 November to fly from London, when ticket prices are also cheap, with an average price of £487.

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 £594. 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 £672.

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 £506. 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 £626. 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 Washington, D.C. Dulles Intl 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 £586 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 £538 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 9% 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 September 2025, prices for London to Washington, D.C. flights are approximately 87% 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

£545

Fastest flight time

8h 10m

Direct flights

Every day

Airports in Washington, D.C.

2 airports
The best one-way flight to Washington, D.C. from London in the past 72 hours is £545. The best return flight deal from London to Washington, D.C. found on momondo in the last 72 hours is £482.
The fastest flight from London to Washington, D.C. takes 8h 10m
Direct flights go from London to Washington, D.C. every day.
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. 8h 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 £187Free CancellationRating
7.9
7,960 reviews
Search Delta flights
PLAYPriceFrom £243Free CancellationRating
7.0
103 reviews
Search PLAY flights
IcelandairPriceFrom £344Free CancellationRating
7.0
546 reviews
Search Icelandair flights
TAP AIR PORTUGALPriceFrom £350Free CancellationRating
7.1
1,977 reviews
Search TAP AIR PORTUGAL flights
JetBluePriceFrom £372Free CancellationRating
7.2
2,913 reviews
Search JetBlue flights
United AirlinesPriceFrom £395Free CancellationRating
7.4
8,937 reviews
Search United Airlines flights
Aer LingusPriceFrom £400Free CancellationRating
7.2
1,271 reviews
Search Aer Lingus flights
FinnairPriceFrom £430Free CancellationRating
7.6
1,323 reviews
Search Finnair flights
LufthansaPriceFrom £434Free CancellationRating
6.8
7,409 reviews
Search Lufthansa flights
Scandinavian AirlinesPriceFrom £434Free CancellationRating
7.4
1,484 reviews
Search Scandinavian Airlines flights

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

    Delta flight deals from London to Washington, D.C. start from £253 round-trip. Over the 7 Delta flights for this route in a normal week, average airfare is usually £717 round-trip - but some users have found much cheaper deals with momondo.

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

    KLM (7.8/10 from 1,385 reviews) operates around 7 flights from London to Washington, D.C. in any given week. The average KLM airfare for this route is around £852, with deals from around £603 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
Essex
Alexandria
Fairfax
Manassas
Bethesda
Oxon Hill
Gettysburg
Cambridge
Ellicott City
Arlington
Westminster
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