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Cheap flights from London to Washington, D.C. from €456

This is the cheapest return 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 27/10. 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

SWISS Logo
18:40 - 17:40LHR-IAD
27h 00m1 stop
SWISS Logo
17:25 - 11:15IAD-LHR
12h 50m1 stop
€456SWISS
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Mon, 27 Oct - Mon, 3 Nov
United Airlines Logo
06:35 - 21:05LHR-IAD
18h 30m1 stop
United Airlines Logo
18:20 - 06:40IAD-LHR
7h 20mdirect
€457United Airlines
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Wed, 29 Oct - Tue, 11 Nov
Brussels Airlines Logo
06:50 - 14:25LHR-IAD
12h 35m1 stop
Brussels Airlines Logo
17:36 - 12:20IAD-LHR
13h 44m1 stop
€460Brussels Airlines
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Sun, 28 Sep - Sat, 11 Oct
Logo
06:50 - 17:26LHR-BWI
15h 36m2 stops
Logo
10:51 - 06:20BWI-LHR
14h 29m1 stop
€464
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Thu, 25 Sep - Tue, 7 Oct
Logo
06:50 - 21:25LHR-BWI
18h 35m2 stops
Logo
10:55 - 05:55BWI-LHR
14h 00m1 stop
€472
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Sat, 1 Nov - Sat, 8 Nov
Brussels Airlines Logo
11:05 - 15:35LHR-IAD
32h 30m1 stop
Brussels Airlines Logo
15:59 - 09:40IAD-LHR
36h 41m1 stop
€476Brussels Airlines
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Mon, 27 Oct - Mon, 3 Nov
British Airways Logo
15:25 - 19:45LHR-BWI
8h 20mdirect
British Airways Logo
20:35 - 08:40BWI-LHR
7h 05mdirect
€479British Airways
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Wed, 29 Oct - Wed, 5 Nov
British Airways Logo
15:25 - 19:45LHR-BWI
8h 20mdirect
British Airways Logo
20:35 - 08:40BWI-LHR
7h 05mdirect
€481British Airways
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Tue, 28 Oct - Tue, 4 Nov
Delta Logo
06:30 - 15:35LHR-IAD
14h 05m1 stop
Delta Logo
22:20 - 10:50IAD-LHR
7h 30mdirect
€488Delta
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Thu, 2 Oct - Wed, 17 Dec
Delta Logo
06:30 - 17:34LHR-BWI
16h 04m2 stops
Delta Logo
19:45 - 13:30BWI-LHR
12h 45m1 stop
€493Delta
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Wed, 8 Oct - Mon, 13 Oct

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

Our best United Airlines deals on London to Washington, D.C. flight tickets
United Airlines
29 Oct
LHR06:35London Heathrow
18h 30m
1 stop
IAD21:05Washington, D.C. Dulles Intl
11 Nov
IAD18:20Washington, D.C. Dulles Intl
7h 20m
LHR06:40London Heathrow
€457
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United Airlines
20 Nov
LHR09:00London Heathrow
17h 24m
2 stops
BWI21:24Baltimore/Washington
4 Dec
BWI13:10Baltimore/Washington
37h 00m
2 stops
LHR07:10London Heathrow
€458
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United Airlines
7 Oct
LHR09:30London Heathrow
11h 20m
1 stop
IAD15:50Washington, D.C. Dulles Intl
15 Oct
IAD22:25Washington, D.C. Dulles Intl
7h 15m
LHR10:40London Heathrow
€459
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Brussels Airlines flights from London to Washington, D.C.

Our best Brussels Airlines deals on London to Washington, D.C. flight tickets
Brussels Airlines
28 Sept
LHR06:50London Heathrow
12h 35m
1 stop
IAD14:25Washington, D.C. Dulles Intl
11 Oct
IAD17:36Washington, D.C. Dulles Intl
13h 44m
1 stop
LHR12:20London Heathrow
€460
Find similar
Brussels Airlines
20 Sept
LHR07:45London Heathrow
10h 45m
1 stop
IAD13:30Washington, D.C. Dulles Intl
26 Sept
IAD17:35Washington, D.C. Dulles Intl
22h 20m
1 stop
LHR20:55London Heathrow
€469
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Brussels Airlines
27 Oct
LHR11:05London Heathrow
32h 30m
1 stop
IAD15:35Washington, D.C. Dulles Intl
3 Nov
IAD15:59Washington, D.C. Dulles Intl
36h 41m
1 stop
LHR09:40London Heathrow
€476
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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 13,528 searches. Data last updated 14 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

Mon 27/10

18:40-17:40

1 stop27h 00m

Washington, D.C. Dulles Intl

Mon 3/11

17:25-11:15

1 stop12h 50m

€456

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 29/10

06:35-21:05

1 stop18h 30m

Washington, D.C. Dulles Intl

Tue 11/11

18:20-06:40

Nonstop7h 20m

€457

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sun 28/9

06:50-14:25

1 stop12h 35m

Washington, D.C. Dulles Intl

Sat 11/10

17:36-12:20

1 stop13h 44m

€460

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Thu 25/9

06:50-17:26

2 stops15h 36m

Baltimore/Washington

Tue 7/10

10:51-06:20

1 stop14h 29m

€464

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Sat 1/11

06:50-21:25

2 stops18h 35m

Baltimore/Washington

Sat 8/11

10:55-05:55

1 stop14h 00m

€472

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 27/10

11:05-15:35

1 stop32h 30m

Washington, D.C. Dulles Intl

Mon 3/11

15:59-09:40

1 stop36h 41m

€476

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Wed 29/10

15:25-19:45

Nonstop8h 20m

Baltimore/Washington

Wed 5/11

20:35-08:40

Nonstop7h 05m

€479

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Tue 28/10

15:25-19:45

Nonstop8h 20m

Baltimore/Washington

Tue 4/11

20:35-08:40

Nonstop7h 05m

€481

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 2/10

06:30-15:35

1 stop14h 05m

Washington, D.C. Dulles Intl

Wed 17/12

22:20-10:50

Nonstop7h 30m

€488

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Wed 8/10

06:30-17:34

2 stops16h 04m

Baltimore/Washington

Mon 13/10

19:45-13:30

1 stop12h 45m

€493

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 €528, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of February, then book flights to Washington, D.C. from London during November instead. Flights to Washington, D.C. in November, while not as cheap as those in February, still average around €561.

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 €666 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 €623 on momondo.

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 89% 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.

Fastest flight time

8h 05m

Direct flights

Every day

Airports in Washington, D.C.

2 airports
The fastest flight from London to Washington, D.C. takes 8h 05m
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?

    A flight from London to Washington, D.C. will travel around 5893.9 km. By plane, this route typically takes 8h 10m.

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

    Prices for flights from London to Washington, D.C. refresh daily.

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to 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 licence 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.?

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

Book flights to Washington, D.C. if you plan to visit one of these locations
Gettysburg

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Washington, D.C. from London.

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

Yes. momondo enables you to select and highlight flights to Washington, D.C. from London with this policy.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Washington, D.C. from London.

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

If you are simply researching potential flights to Washington, D.C., momondo offers a useful price alert feature which will track prices for flights to Washington, D.C. from London and alert you when they change.

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 36.1 km from Washington, D.C.
Washington, D.C. Reagan-National Airport
Washington, D.C. Dulles Intl Airport