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Cheap flights from London Heathrow Airport to Washington, D.C. from €434

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 9/3. 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.
Lufthansa Logo
07:25 - 15:00
LHR
-
IAD
12h 35m
1 stop
Lufthansa Logo
18:25 - 06:55
IAD
-
LHR
7h 30mdirect
€477Lufthansa
Sat, 2 May - Sat, 16 May
British Airways Logo
08:50 - 15:35
LHR
-
IAD
11h 45m
1 stop
British Airways Logo
18:20 - 06:30
IAD
-
LHR
7h 10mdirect
€480British Airways
Thu, 29 Jan - Sun, 15 Feb
Delta Logo
08:40 - 23:01
LHR
-
BWI
18h 21m
2 stops
Delta Logo
17:35 - 12:05
BWI
-
LHR
13h 30m
2 stops
€480Delta
Thu, 26 Mar - Mon, 6 Apr
United Airlines Logo
08:45 - 16:45
LHR
-
IAD
13h 00m
1 stop
United Airlines Logo
06:00 - 20:40
IAD
-
LHR
9h 40m
1 stop
€481United Airlines
Tue, 7 Apr - Sun, 19 Apr
United Airlines Logo
08:40 - 16:45
LHR
-
IAD
13h 05m
1 stop
United Airlines Logo
22:15 - 10:40
IAD
-
LHR
7h 25mdirect
€482United Airlines
Wed, 13 May - Sun, 24 May
United Airlines Logo
09:30 - 16:05
LHR
-
IAD
11h 35m
1 stop
United Airlines Logo
22:20 - 17:05
IAD
-
LHR
13h 45m
1 stop
€483United Airlines
Tue, 12 May - Tue, 19 May
United Airlines Logo
07:25 - 15:00
LHR
-
IAD
12h 35m
1 stop
United Airlines Logo
18:25 - 06:55
IAD
-
LHR
7h 30mdirect
€485United Airlines
Wed, 8 Apr - Sun, 19 Apr
Icelandair Logo
21:25 - 19:25
LHR
-
BWI
27h 00m
1 stop
Icelandair Logo
20:30 - 20:20
BWI
-
LHR
18h 50m
1 stop
€487Icelandair
Mon, 30 Mar - Fri, 3 Apr
Icelandair Logo
12:15 - 18:40
LHR
-
BWI
11h 25m
1 stop
Icelandair Logo
19:40 - 10:50
BWI
-
LHR
10h 10m
1 stop
€488Icelandair
Fri, 27 Feb - Tue, 3 Mar
Delta Logo
10:45 - 22:10
LHR
-
BWI
15h 25m
1 stop
Delta Logo
14:38 - 06:45
BWI
-
LHR
11h 07m
1 stop
€495Delta
Thu, 26 Mar - Mon, 6 Apr

British Airways flights from London Heathrow Airport to Washington, D.C.

Our best British Airways deals on London Heathrow Airport to Washington, D.C. flight tickets
British Airways
29 Jan
LHR08:50London Heathrow
11h 45m
1 stop
IAD15:35Washington, D.C. Dulles Intl
15 Feb
IAD18:20Washington, D.C. Dulles Intl
7h 10m
LHR06:30London Heathrow
€480
British Airways
21 Jan
LHR08:50London Heathrow
11h 45m
1 stop
IAD15:35Washington, D.C. Dulles Intl
24 Jan
IAD17:46Washington, D.C. Dulles Intl
32h 34m
1 stop
LHR07:20London Heathrow
€484
British Airways
13 Feb
LHR07:50London Heathrow
12h 45m
1 stop
IAD15:35Washington, D.C. Dulles Intl
23 Feb
IAD21:45Washington, D.C. Dulles Intl
7h 15m
LHR10:00London Heathrow
€490

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

Our best Scandinavian Airlines deals on London Heathrow Airport to Washington, D.C. flight tickets
Scandinavian Airlines
18 Feb
LHR21:05London Heathrow
25h 10m
2 stops
IAD17:15Washington, D.C. Dulles Intl
28 Feb
IAD20:30Washington, D.C. Dulles Intl
17h 20m
2 stops
LHR18:50London Heathrow
€546
Scandinavian Airlines
13 Feb
LHR21:05London Heathrow
26h 45m
2 stops
IAD18:50Washington, D.C. Dulles Intl
23 Feb
IAD20:30Washington, D.C. Dulles Intl
17h 20m
2 stops
LHR18:50London Heathrow
€549
Scandinavian Airlines
28 Jan
LHR21:05London Heathrow
25h 10m
2 stops
IAD17:15Washington, D.C. Dulles Intl
26 Feb
IAD20:30Washington, D.C. Dulles Intl
14h 55m
2 stops
LHR16:25London Heathrow
€600

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 16 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

Sat 2/5

07:25-15:00

1 stop12h 35m

Washington, D.C. Dulles Intl

Sat 16/5

18:25-06:55

Nonstop7h 30m

€477

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 29/1

08:50-15:35

1 stop11h 45m

Washington, D.C. Dulles Intl

Sun 15/2

18:20-06:30

Nonstop7h 10m

€480

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Thu 26/3

08:40-23:01

2 stops18h 21m

Baltimore/Washington

Mon 6/4

17:35-12:05

2 stops13h 30m

€480

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Tue 7/4

08:45-16:45

1 stop13h 00m

Washington, D.C. Dulles Intl

Sun 19/4

06:00-20:40

1 stop9h 40m

€481

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 13/5

08:40-16:45

1 stop13h 05m

Washington, D.C. Dulles Intl

Sun 24/5

22:15-10:40

Nonstop7h 25m

€482

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Tue 12/5

09:30-16:05

1 stop11h 35m

Washington, D.C. Dulles Intl

Tue 19/5

22:20-17:05

1 stop13h 45m

€483

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 8/4

07:25-15:00

1 stop12h 35m

Washington, D.C. Dulles Intl

Sun 19/4

18:25-06:55

Nonstop7h 30m

€485

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Mon 30/3

21:25-19:25

1 stop27h 00m

Baltimore/Washington

Fri 3/4

20:30-20:20

1 stop18h 50m

€487

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Fri 27/2

12:15-18:40

1 stop11h 25m

Baltimore/Washington

Tue 3/3

19:40-10:50

1 stop10h 10m

€488

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Thu 26/3

10:45-22:10

1 stop15h 25m

Baltimore/Washington

Mon 6/4

14:38-06:45

1 stop11h 07m

€495

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 January. Flight prices, which tend to average around €552, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of January, then book flights to Washington, D.C. from London Heathrow Airport during September instead. Flights to Washington, D.C. in September, while not as cheap as those in January, still average around €554.

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 €647 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 €611 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 January 2026, prices for London Heathrow Airport to Washington, D.C. flights are approximately 9% 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 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