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Cheap flights from London Heathrow Airport to Washington, D.C. from €451

This is the cheapest return flight price found by a momondo user in the last 72 hours by searching for a flight from London Heathrow Airport to Washington, D.C. departing on 31/10. 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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Find the cheapest flights from London Heathrow Airport to Washington, D.C.

Cheap return flights

United Airlines Logo
09:00 - 17:40LHR-IAD
12h 40m1 stop
United Airlines Logo
18:20 - 06:40IAD-LHR
7h 20mdirect
€451United Airlines
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Fri, 31 Oct - Fri, 7 Nov
Icelandair Logo
20:35 - 18:30LHR-IAD
26h 55m1 stop
Icelandair Logo
19:40 - 10:50IAD-LHR
10h 10m1 stop
€452Icelandair
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Sun, 11 Jan - Sat, 17 Jan
Austrian Airlines Logo
19:25 - 14:40LHR-IAD
24h 15m1 stop
Austrian Airlines Logo
22:15 - 10:50IAD-LHR
7h 35mdirect
€453Austrian Airlines
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Thu, 6 Nov - Wed, 12 Nov
Multiple Airlines Logo
06:00 - 17:14LHR-BWI
16h 14m2 stops
Multiple Airlines Logo
13:10 - 07:10BWI-LHR
13h 00m2 stops
€456Multiple Airlines
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Thu, 20 Nov - Sat, 6 Dec
Multiple Airlines Logo
06:00 - 17:14LHR-BWI
16h 14m2 stops
Multiple Airlines Logo
17:12 - 11:15BWI-LHR
13h 03m1 stop
€457Multiple Airlines
Find Deal
Thu, 6 Nov - Mon, 10 Nov
Austrian Airlines Logo
06:00 - 14:40LHR-IAD
13h 40m1 stop
Austrian Airlines Logo
17:15 - 05:55IAD-LHR
31h 40m1 stop
€458Austrian Airlines
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Thu, 6 Nov - Sat, 22 Nov
Brussels Airlines Logo
06:50 - 14:25LHR-IAD
12h 35m1 stop
Brussels Airlines Logo
16:00 - 12:20IAD-LHR
15h 20m1 stop
€459Brussels Airlines
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Thu, 2 Oct - Wed, 15 Oct
Brussels Airlines Logo
06:50 - 14:35LHR-IAD
12h 45m1 stop
Brussels Airlines Logo
15:59 - 09:40IAD-LHR
36h 41m1 stop
€462Brussels Airlines
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Thu, 6 Nov - Wed, 12 Nov
British Airways Logo
15:25 - 18:45LHR-BWI
8h 20mdirect
British Airways Logo
20:35 - 08:40BWI-LHR
7h 05mdirect
€478British Airways
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Tue, 2 Dec - Thu, 11 Dec
British Airways Logo
16:25 - 19:55LHR-IAD
8h 30mdirect
British Airways Logo
21:45 - 10:00IAD-LHR
7h 15mdirect
€479British Airways
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Thu, 6 Nov - Wed, 12 Nov

Austrian Airlines flights from London Heathrow Airport to Washington, D.C.

Our best Austrian Airlines deals on London Heathrow Airport to Washington, D.C. flight tickets
Austrian Airlines
6 Nov
LHR06:00London Heathrow
13h 40m
1 stop
IAD14:40Washington, D.C. Dulles Intl
12 Nov
IAD22:15Washington, D.C. Dulles Intl
7h 35m
LHR10:50London Heathrow
€453
Find similar
Austrian Airlines
6 Nov
LHR06:00London Heathrow
13h 40m
1 stop
IAD14:40Washington, D.C. Dulles Intl
12 Nov
IAD22:15Washington, D.C. Dulles Intl
7h 35m
LHR10:50London Heathrow
€455
Find similar
Austrian Airlines
23 Sept
LHR19:30London Heathrow
24h 05m
1 stop
IAD14:35Washington, D.C. Dulles Intl
1 Oct
IAD17:15Washington, D.C. Dulles Intl
32h 05m
1 stop
LHR06:20London Heathrow
€458
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United Airlines flights from London Heathrow Airport to Washington, D.C.

Our best United Airlines deals on London Heathrow Airport to Washington, D.C. flight tickets
United Airlines
25 Sept
LHR08:40London Heathrow
12h 35m
1 stop
IAD16:15Washington, D.C. Dulles Intl
29 Sept
IAD22:25Washington, D.C. Dulles Intl
7h 15m
LHR10:40London Heathrow
€451
Find similar
United Airlines
25 Sept
LHR08:40London Heathrow
12h 35m
1 stop
IAD16:15Washington, D.C. Dulles Intl
29 Sept
IAD06:15Washington, D.C. Dulles Intl
9h 25m
1 stop
LHR20:40London Heathrow
€452
Find similar
United Airlines
2 Oct
LHR09:30London Heathrow
11h 20m
1 stop
IAD15:50Washington, D.C. Dulles Intl
7 Oct
IAD18:40Washington, D.C. Dulles Intl
7h 15m
LHR06:55London Heathrow
€454
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from London Heathrow Airport 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 18 September 2025.
Use the filters below to find and compare flights from London Heathrow Airport 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 31/10

09:00-17:40

1 stop12h 40m

Washington, D.C. Dulles Intl

Fri 7/11

18:20-06:40

Nonstop7h 20m

€451

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sun 11/1

20:35-18:30

1 stop26h 55m

Washington, D.C. Dulles Intl

Sat 17/1

19:40-10:50

1 stop10h 10m

€452

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 6/11

19:25-14:40

1 stop24h 15m

Washington, D.C. Dulles Intl

Wed 12/11

22:15-10:50

Nonstop7h 35m

€453

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Thu 20/11

06:00-17:14

2 stops16h 14m

Baltimore/Washington

Sat 6/12

13:10-07:10

2 stops13h 00m

€456

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Thu 6/11

06:00-17:14

2 stops16h 14m

Baltimore/Washington

Mon 10/11

17:12-11:15

1 stop13h 03m

€457

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 6/11

06:00-14:40

1 stop13h 40m

Washington, D.C. Dulles Intl

Sat 22/11

17:15-05:55

1 stop31h 40m

€458

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 2/10

06:50-14:25

1 stop12h 35m

Washington, D.C. Dulles Intl

Wed 15/10

16:00-12:20

1 stop15h 20m

€459

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 6/11

06:50-14:35

1 stop12h 45m

Washington, D.C. Dulles Intl

Wed 12/11

15:59-09:40

1 stop36h 41m

€462

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Tue 2/12

15:25-18:45

Nonstop8h 20m

Baltimore/Washington

Thu 11/12

20:35-08:40

Nonstop7h 05m

€478

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 6/11

16:25-19:55

Nonstop8h 30m

Washington, D.C. Dulles Intl

Wed 12/11

21:45-10:00

Nonstop7h 15m

€479

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 Heathrow Airport 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 cheapest month to fly to Washington, D.C.?

The cheapest month to fly to Washington, D.C. from London Heathrow Airport is in September. Flight prices, which tend to average around €558, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of September, then book flights to Washington, D.C. from London Heathrow Airport during February instead. Flights to Washington, D.C. in February, while not as cheap as those in September, still average around €588.

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

Fly from London Heathrow to Washington, D.C. Dulles Intl for the best London Heathrow - 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 Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. for around €660 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 Heathrow Airport for as low as €617 on momondo.

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

There is only 1 cabin class available to choose from on London Heathrow 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.

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

As of September 2025, prices for London Heathrow Airport to Washington, D.C. flights are approximately 30% more expensive when compared to flights at the same time last year.

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

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

Cheap London Heathrow Airport to Washington, D.C. (LHR to WAS) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport 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 Heathrow Airport to Washington, D.C. takes 8h 05m
Direct flights go from London Heathrow Airport to Washington, D.C. every day.
There are 2 airports near Washington, D.C.: Baltimore/Washington (BWI), Washington, D.C. Dulles Intl (IAD)
Search flight deals

  • How far is London Heathrow to Washington, D.C. by plane?

    Washington, D.C. is 5873.1 km away from London Heathrow. A reasonable flight in good conditions will take 8h 15m.

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

    Prices for flights from London Heathrow Airport to Washington, D.C. are refreshed on a daily basis.

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and stopovers. It is recommended that you verify with the airline you are booking with for travel from London Heathrow Airport to Washington, D.C..

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

    The travel and health documents required for your trip to Washington, D.C. can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s licence, and a passport valid for six-months after you plan to arrive at Washington, D.C.. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from London Heathrow Airport 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.?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from London to Washington, D.C.. momondo saves you time and could save you money on your trip.

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

Yes. momondo allows you to filter the results for London to Washington, D.C. flights to just show those with flexible booking policies.

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 not ready to book a flight from London to Washington, D.C. now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Washington, D.C. and let you know when they change.

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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