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

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 Heathrow Airport to Washington, D.C. departing on 11/4. 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

Enter your travel dates to find the best prices.
SWISS Logo
08:45 - 16:45
LHR
-
IAD
13h 00m
1 stop
SWISS Logo
20:20 - 16:25
IAD
-
LHR
15h 05m
1 stop
€469SWISS
Tue, 21 Apr - Tue, 28 Apr
Austrian Airlines Logo
06:00 - 14:35
LHR
-
IAD
13h 35m
1 stop
Austrian Airlines Logo
22:10 - 10:40
IAD
-
LHR
7h 30mdirect
€471Austrian Airlines
Tue, 21 Apr - Tue, 28 Apr
Austrian Airlines Logo
06:00 - 14:35
LHR
-
IAD
13h 35m
1 stop
Austrian Airlines Logo
18:25 - 06:55
IAD
-
LHR
7h 30mdirect
€472Austrian Airlines
Mon, 27 Apr - Tue, 12 May
United Airlines Logo
09:30 - 16:05
LHR
-
IAD
11h 35m
1 stop
United Airlines Logo
18:25 - 06:55
IAD
-
LHR
7h 30mdirect
€474United Airlines
Mon, 13 Apr - Thu, 23 Apr
British Airways Logo
08:50 - 15:35
LHR
-
IAD
11h 45m
1 stop
British Airways Logo
18:20 - 06:30
IAD
-
LHR
7h 10mdirect
€476British Airways
Tue, 10 Feb - Tue, 17 Feb
British Airways Logo
08:50 - 15:35
LHR
-
IAD
11h 45m
1 stop
British Airways Logo
18:20 - 06:30
IAD
-
LHR
7h 10mdirect
€477British Airways
Wed, 18 Feb - Sat, 28 Feb
United Airlines Logo
15:30 - 14:35
LHR
-
IAD
28h 05m
1 stop
United Airlines Logo
12:35 - 06:20
IAD
-
LHR
12h 45m
1 stop
€478United Airlines
Sun, 15 Feb - Tue, 24 Feb
United Airlines Logo
12:10 - 16:45
LHR
-
IAD
33h 35m
1 stop
United Airlines Logo
09:45 - 06:30
IAD
-
LHR
15h 45m
1 stop
€480United Airlines
Wed, 22 Apr - Wed, 1 Jul
Icelandair Logo
12:15 - 18:40
LHR
-
BWI
11h 25m
1 stop
Icelandair Logo
19:40 - 10:50
BWI
-
LHR
10h 10m
1 stop
€484Icelandair
Tue, 3 Feb - Tue, 10 Feb
Icelandair Logo
20:35 - 18:40
LHR
-
BWI
27h 05m
1 stop
Icelandair Logo
19:40 - 10:50
BWI
-
LHR
10h 10m
1 stop
€485Icelandair
Tue, 10 Feb - Mon, 23 Feb

Icelandair flights from London Heathrow Airport to Washington, D.C.

Our best Icelandair deals on London Heathrow Airport to Washington, D.C. flight tickets
Icelandair
16 May
LHR13:05London Heathrow
11h 15m
1 stop
IAD19:20Washington, D.C. Dulles Intl
20 May
IAD20:30Washington, D.C. Dulles Intl
10h 25m
1 stop
LHR11:55London Heathrow
€482
Icelandair
3 Feb
LHR12:15London Heathrow
11h 25m
1 stop
BWI18:40Baltimore/Washington
10 Feb
BWI19:40Baltimore/Washington
10h 10m
1 stop
LHR10:50London Heathrow
€484
Icelandair
10 Feb
LHR20:35London Heathrow
27h 05m
1 stop
BWI18:40Baltimore/Washington
23 Feb
BWI19:40Baltimore/Washington
10h 10m
1 stop
LHR10:50London Heathrow
€485

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
13 Apr
LHR09:30London Heathrow
11h 35m
1 stop
IAD16:05Washington, D.C. Dulles Intl
23 Apr
IAD18:25Washington, D.C. Dulles Intl
7h 30m
LHR06:55London Heathrow
€474
United Airlines
15 Feb
LHR15:30London Heathrow
28h 05m
1 stop
IAD14:35Washington, D.C. Dulles Intl
24 Feb
IAD12:35Washington, D.C. Dulles Intl
12h 45m
1 stop
LHR06:20London Heathrow
€478
United Airlines
22 Apr
LHR12:10London Heathrow
33h 35m
1 stop
IAD16:45Washington, D.C. Dulles Intl
1 Jul
IAD09:45Washington, D.C. Dulles Intl
15h 45m
1 stop
LHR06:30London Heathrow
€480

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 22 January 2026.
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

Tue 21/4

08:45-16:45

1 stop13h 00m

Washington, D.C. Dulles Intl

Tue 28/4

20:20-16:25

1 stop15h 05m

€469

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Tue 21/4

06:00-14:35

1 stop13h 35m

Washington, D.C. Dulles Intl

Tue 28/4

22:10-10:40

Nonstop7h 30m

€471

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 27/4

06:00-14:35

1 stop13h 35m

Washington, D.C. Dulles Intl

Tue 12/5

18:25-06:55

Nonstop7h 30m

€472

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 13/4

09:30-16:05

1 stop11h 35m

Washington, D.C. Dulles Intl

Thu 23/4

18:25-06:55

Nonstop7h 30m

€474

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Tue 10/2

08:50-15:35

1 stop11h 45m

Washington, D.C. Dulles Intl

Tue 17/2

18:20-06:30

Nonstop7h 10m

€476

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 18/2

08:50-15:35

1 stop11h 45m

Washington, D.C. Dulles Intl

Sat 28/2

18:20-06:30

Nonstop7h 10m

€477

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sun 15/2

15:30-14:35

1 stop28h 05m

Washington, D.C. Dulles Intl

Tue 24/2

12:35-06:20

1 stop12h 45m

€478

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 22/4

12:10-16:45

1 stop33h 35m

Washington, D.C. Dulles Intl

Wed 1/7

09:45-06:30

1 stop15h 45m

€480

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Tue 3/2

12:15-18:40

1 stop11h 25m

Baltimore/Washington

Tue 10/2

19:40-10:50

1 stop10h 10m

€484

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Tue 10/2

20:35-18:40

1 stop27h 05m

Baltimore/Washington

Mon 23/2

19:40-10:50

1 stop10h 10m

€485

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 €550, 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 January instead. Flights to Washington, D.C. in January, while not as cheap as those in September, still average around €553.

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 €639 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 €612 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.

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

You could potentially save up to 24% on your flight if you consider stops on a London Heathrow Airport to Washington, D.C. flight.

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

As of January 2026, prices for London Heathrow Airport to Washington, D.C. flights are approximately 1% cheaper 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 10m

Direct flights

Every day

Airports in Washington, D.C.

2 airports
The fastest flight from London Heathrow Airport to Washington, D.C. takes 8h 10m
Direct flights go from London Heathrow Airport to Washington, D.C. every day.
There are 2 airports in Washington, D.C.. From London Heathrow Airport there are direct flights to 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 10m.

  • 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