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Cheap flights from London Heathrow Airport to Washington, D.C. from €397

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 10/2. 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.
Multiple Airlines Logo
09:00 - 16:40
LHR
-
IAD
12h 40m
1 stop
Multiple Airlines Logo
23:15 - 10:50
IAD
-
LHR
7h 35mdirect
€471Multiple Airlines
Sun, 1 Mar - Sun, 8 Mar
Austrian Airlines Logo
06:00 - 15:40
LHR
-
IAD
13h 40m
1 stop
Austrian Airlines Logo
23:15 - 10:50
IAD
-
LHR
7h 35mdirect
€479Austrian Airlines
Sun, 15 Mar - Sat, 21 Mar
Austrian Airlines Logo
09:05 - 15:40
LHR
-
IAD
34h 35m
1 stop
Austrian Airlines Logo
19:20 - 06:40
IAD
-
LHR
7h 20mdirect
€482Austrian Airlines
Wed, 11 Mar - Mon, 23 Mar
Austrian Airlines Logo
12:20 - 14:35
LHR
-
IAD
31h 15m
1 stop
Austrian Airlines Logo
18:25 - 06:55
IAD
-
LHR
7h 30mdirect
€486Austrian Airlines
Fri, 24 Apr - Sun, 26 Apr
Lufthansa Logo
08:30 - 15:50
LHR
-
IAD
12h 20m
1 stop
Lufthansa Logo
22:15 - 10:50
IAD
-
LHR
7h 35mdirect
€487Lufthansa
Mon, 16 Feb - Thu, 19 Feb
Austrian Airlines Logo
19:30 - 14:35
LHR
-
IAD
24h 05m
1 stop
Austrian Airlines Logo
22:10 - 10:40
IAD
-
LHR
7h 30mdirect
€490Austrian Airlines
Wed, 22 Apr - Sun, 26 Apr
Multiple Airlines Logo
09:00 - 17:40
LHR
-
IAD
12h 40m
1 stop
Multiple Airlines Logo
23:15 - 10:50
IAD
-
LHR
7h 35mdirect
€497Multiple Airlines
Tue, 10 Mar - Mon, 16 Mar
SWISS Logo
09:00 - 17:40
LHR
-
IAD
12h 40m
1 stop
SWISS Logo
21:30 - 13:00
IAD
-
LHR
11h 30m
1 stop
€498SWISS
Tue, 17 Mar - Tue, 24 Mar
United Airlines Logo
12:05 - 21:17
LHR
-
BWI
38h 12m
2 stops
United Airlines Logo
08:09 - 07:55
BWI
-
LHR
19h 46m
1 stop
€502United Airlines
Tue, 24 Feb - Wed, 11 Mar
United Airlines Logo
06:35 - 21:42
LHR
-
BWI
19h 07m
2 stops
United Airlines Logo
17:12 - 13:00
BWI
-
LHR
15h 48m
2 stops
€506United Airlines
Tue, 17 Mar - Tue, 24 Mar

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

Our best Delta deals on London Heathrow Airport to Washington, D.C. flight tickets
Delta
11 Mar
LHR10:00London Heathrow
11h 05m
1 stop
IAD17:05Washington, D.C. Dulles Intl
18 Mar
IAD23:20Washington, D.C. Dulles Intl
7h 20m
LHR10:40London Heathrow
€520
Delta
4 May
LHR09:55London Heathrow
10h 40m
1 stop
IAD15:35Washington, D.C. Dulles Intl
13 May
IAD22:55Washington, D.C. Dulles Intl
7h 25m
LHR11:20London Heathrow
€528
Delta
4 May
LHR09:55London Heathrow
10h 40m
1 stop
IAD15:35Washington, D.C. Dulles Intl
25 May
IAD15:08Washington, D.C. Dulles Intl
10h 37m
1 stop
LHR06:45London Heathrow
€550

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
12 Feb
LHR09:05London Heathrow
34h 35m
1 stop
IAD14:40Washington, D.C. Dulles Intl
23 Feb
IAD17:17Washington, D.C. Dulles Intl
12h 58m
1 stop
LHR11:15London Heathrow
€475
Austrian Airlines
13 Feb
LHR09:05London Heathrow
34h 35m
1 stop
IAD14:40Washington, D.C. Dulles Intl
22 Feb
IAD18:20Washington, D.C. Dulles Intl
7h 20m
LHR06:40London Heathrow
€478
Austrian Airlines
15 Mar
LHR06:00London Heathrow
13h 40m
1 stop
IAD15:40Washington, D.C. Dulles Intl
21 Mar
IAD23:15Washington, D.C. Dulles Intl
7h 35m
LHR10:50London Heathrow
€479

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 5 February 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

Sun 1/3

09:00-16:40

1 stop12h 40m

Washington, D.C. Dulles Intl

Sun 8/3

23:15-10:50

Nonstop7h 35m

€471

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sun 15/3

06:00-15:40

1 stop13h 40m

Washington, D.C. Dulles Intl

Sat 21/3

23:15-10:50

Nonstop7h 35m

€479

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 11/3

09:05-15:40

1 stop34h 35m

Washington, D.C. Dulles Intl

Mon 23/3

19:20-06:40

Nonstop7h 20m

€482

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 24/4

12:20-14:35

1 stop31h 15m

Washington, D.C. Dulles Intl

Sun 26/4

18:25-06:55

Nonstop7h 30m

€486

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 16/2

08:30-15:50

1 stop12h 20m

Washington, D.C. Dulles Intl

Thu 19/2

22:15-10:50

Nonstop7h 35m

€487

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 22/4

19:30-14:35

1 stop24h 05m

Washington, D.C. Dulles Intl

Sun 26/4

22:10-10:40

Nonstop7h 30m

€490

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Tue 10/3

09:00-17:40

1 stop12h 40m

Washington, D.C. Dulles Intl

Mon 16/3

23:15-10:50

Nonstop7h 35m

€497

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Tue 17/3

09:00-17:40

1 stop12h 40m

Washington, D.C. Dulles Intl

Tue 24/3

21:30-13:00

1 stop11h 30m

€498

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Tue 24/2

12:05-21:17

2 stops38h 12m

Baltimore/Washington

Wed 11/3

08:09-07:55

1 stop19h 46m

€502

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Tue 17/3

06:35-21:42

2 stops19h 07m

Baltimore/Washington

Tue 24/3

17:12-13:00

2 stops15h 48m

€506

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 €545, 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 €549.

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 €632 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 €608 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 February 2026, prices for London Heathrow Airport to Washington, D.C. flights are approximately 5% 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
Landover

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