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Cheap flights from London Heathrow Airport to Washington, D.C. from €447

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 5/2. 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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0 bags
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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.
Austrian Airlines Logo
19:25 - 14:40
LHR
-
IAD
24h 15m
1 stop
Austrian Airlines Logo
22:15 - 10:50
IAD
-
LHR
7h 35mdirect
€458Austrian Airlines
Wed, 25 Feb - Mon, 2 Mar
TAP AIR PORTUGAL Logo
08:15 - 21:00
LHR
-
IAD
17h 45m
1 stop
TAP AIR PORTUGAL Logo
17:30 - 17:30
IAD
-
LHR
19h 00m
1 stop
€459TAP AIR PORTUGAL
Fri, 6 Feb - Mon, 16 Feb
United Airlines Logo
09:00 - 16:40
LHR
-
IAD
12h 40m
1 stop
United Airlines Logo
08:31 - 07:10
IAD
-
LHR
17h 39m
2 stops
€460United Airlines
Thu, 19 Feb - Mon, 23 Feb
United Airlines Logo
06:35 - 15:35
LHR
-
IAD
14h 00m
1 stop
United Airlines Logo
06:00 - 21:20
IAD
-
LHR
10h 20m
1 stop
€461United Airlines
Fri, 13 Feb - Fri, 20 Feb
United Airlines Logo
07:30 - 14:35
LHR
-
IAD
12h 05m
1 stop
United Airlines Logo
06:00 - 20:35
IAD
-
LHR
9h 35m
1 stop
€462United Airlines
Sat, 21 Feb - Thu, 5 Mar
United Airlines Logo
08:30 - 15:50
LHR
-
IAD
12h 20m
1 stop
United Airlines Logo
18:20 - 06:40
IAD
-
LHR
7h 20mdirect
€463United Airlines
Fri, 6 Feb - Thu, 19 Feb
United Airlines Logo
06:50 - 14:35
LHR
-
IAD
12h 45m
1 stop
United Airlines Logo
13:20 - 05:55
IAD
-
LHR
11h 35m
1 stop
€463United Airlines
Fri, 13 Feb - Sat, 21 Feb
Icelandair Logo
13:05 - 19:20
LHR
-
IAD
11h 15m
1 stop
Icelandair Logo
20:30 - 11:55
IAD
-
LHR
10h 25m
1 stop
€465Icelandair
Wed, 8 Apr - Fri, 17 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
€485Icelandair
Fri, 27 Feb - Tue, 3 Mar
Icelandair Logo
20:35 - 18:40
LHR
-
BWI
27h 05m
1 stop
Icelandair Logo
19:40 - 19:30
BWI
-
LHR
18h 50m
1 stop
€487Icelandair
Mon, 23 Feb - Tue, 3 Mar

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
4 Mar
LHR08:50London Heathrow
11h 45m
1 stop
IAD15:35Washington, D.C. Dulles Intl
3 Jun
IAD19:15Washington, D.C. Dulles Intl
7h 30m
LHR07:45London Heathrow
€478
British Airways
19 Mar
LHR16:25London Heathrow
8h 30m
IAD20:55Washington, D.C. Dulles Intl
1 Apr
IAD22:25Washington, D.C. Dulles Intl
7h 25m
LHR10:50London Heathrow
€490
British Airways
17 Mar
LHR08:50London Heathrow
11h 45m
1 stop
IAD16:35Washington, D.C. Dulles Intl
5 Apr
IAD17:40Washington, D.C. Dulles Intl
7h 40m
LHR06:20London Heathrow
€495

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
8 Apr
LHR13:05London Heathrow
11h 15m
1 stop
IAD19:20Washington, D.C. Dulles Intl
17 Apr
IAD20:30Washington, D.C. Dulles Intl
10h 25m
1 stop
LHR11:55London Heathrow
€465
Icelandair
22 May
LHR21:25London Heathrow
26h 55m
1 stop
IAD19:20Washington, D.C. Dulles Intl
27 May
IAD20:30Washington, D.C. Dulles Intl
10h 25m
1 stop
LHR11:55London Heathrow
€474
Icelandair
22 May
LHR13:05London Heathrow
11h 15m
1 stop
IAD19:20Washington, D.C. Dulles Intl
27 May
IAD20:30Washington, D.C. Dulles Intl
10h 25m
1 stop
LHR11:55London Heathrow
€477

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 27 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

Wed 25/2

19:25-14:40

1 stop24h 15m

Washington, D.C. Dulles Intl

Mon 2/3

22:15-10:50

Nonstop7h 35m

€458

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 6/2

08:15-21:00

1 stop17h 45m

Washington, D.C. Dulles Intl

Mon 16/2

17:30-17:30

1 stop19h 00m

€459

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 19/2

09:00-16:40

1 stop12h 40m

Washington, D.C. Dulles Intl

Mon 23/2

08:31-07:10

2 stops17h 39m

€460

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 13/2

06:35-15:35

1 stop14h 00m

Washington, D.C. Dulles Intl

Fri 20/2

06:00-21:20

1 stop10h 20m

€461

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sat 21/2

07:30-14:35

1 stop12h 05m

Washington, D.C. Dulles Intl

Thu 5/3

06:00-20:35

1 stop9h 35m

€462

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 6/2

08:30-15:50

1 stop12h 20m

Washington, D.C. Dulles Intl

Thu 19/2

18:20-06:40

Nonstop7h 20m

€463

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 13/2

06:50-14:35

1 stop12h 45m

Washington, D.C. Dulles Intl

Sat 21/2

13:20-05:55

1 stop11h 35m

€463

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 8/4

13:05-19:20

1 stop11h 15m

Washington, D.C. Dulles Intl

Fri 17/4

20:30-11:55

1 stop10h 25m

€465

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

€485

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Mon 23/2

20:35-18:40

1 stop27h 05m

Baltimore/Washington

Tue 3/3

19:40-19:30

1 stop18h 50m

€487

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 typical price of a round-trip flight between London Heathrow Airport 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 Heathrow Airport is in January. Flight prices, which tend to average around €543, 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 €544.

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 €630 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 €603 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