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Cheap flights from London Heathrow Airport to Washington, D.C. from £270

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 2/9. 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

TAP AIR PORTUGAL Logo
08:00 - 20:50LHR-IAD
17h 50m1 stop
TAP AIR PORTUGAL Logo
18:30 - 12:40IAD-LHR
14h 10m1 stop
£366TAP AIR PORTUGAL
Find Deal
Thu, 23 Oct - Mon, 27 Oct
Icelandair Logo
12:15 - 18:20LHR-IAD
11h 05m1 stop
Icelandair Logo
19:40 - 19:30IAD-LHR
18h 50m1 stop
£370Icelandair
Find Deal
Thu, 6 Nov - Mon, 10 Nov
United Airlines Logo
17:40 - 13:38LHR-IAD
24h 58m2 stops
United Airlines Logo
22:15 - 16:40IAD-LHR
13h 25m1 stop
£371United Airlines
Find Deal
Sat, 27 Sep - Sun, 28 Sep
Icelandair Logo
12:15 - 18:20LHR-IAD
11h 05m1 stop
Icelandair Logo
19:40 - 19:30IAD-LHR
18h 50m1 stop
£379Icelandair
Find Deal
Fri, 7 Nov - Mon, 10 Nov
Aer Lingus Logo
13:25 - 19:30LHR-IAD
11h 05m1 stop
Aer Lingus Logo
17:05 - 08:05IAD-LHR
10h 00m1 stop
£382Aer Lingus
Find Deal
Wed, 8 Oct - Sun, 30 Nov
TAP AIR PORTUGAL Logo
06:00 - 15:20LHR-IAD
14h 20m1 stop
TAP AIR PORTUGAL Logo
17:45 - 10:20IAD-LHR
11h 35m1 stop
£383TAP AIR PORTUGAL
Find Deal
Wed, 15 Oct - Sun, 19 Oct
Aer Lingus Logo
08:50 - 15:50LHR-IAD
12h 00m1 stop
Aer Lingus Logo
20:25 - 12:40IAD-LHR
11h 15m1 stop
£388Aer Lingus
Find Deal
Sun, 31 Aug - Sat, 13 Sep
JetBlue Logo
08:15 - 22:56LHR-DCA
19h 41m1 stop
JetBlue Logo
17:42 - 20:45DCA-LHR
22h 03m1 stop
£417JetBlue
Find Deal
Wed, 17 Sep - Mon, 22 Sep
JetBlue Logo
11:55 - 19:22LHR-DCA
12h 27m1 stop
JetBlue Logo
06:25 - 20:45DCA-LHR
9h 20m1 stop
£422JetBlue
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Tue, 30 Sep - Mon, 6 Oct
Finnair Logo
08:55 - 17:30LHR-DCA
13h 35m1 stop
Finnair Logo
13:33 - 07:50DCA-LHR
13h 17m1 stop
£483Finnair
Find Deal
Sun, 21 Sep - Thu, 2 Oct

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
27 Sept
LHR17:40London Heathrow
24h 58m
2 stops
IAD13:38Washington, D.C. Dulles Intl
28 Sept
IAD22:15Washington, D.C. Dulles Intl
13h 25m
1 stop
LHR16:40London Heathrow
£371
Find similar
United Airlines
13 Sept
LHR12:15London Heathrow
8h 15m
IAD15:30Washington, D.C. Dulles Intl
13 Sept
IAD17:37Washington, D.C. Dulles Intl
31h 53m
1 stop
LHR06:30London Heathrow
£422
Find similar
United Airlines
31 Aug
LHR08:30London Heathrow
13h 31m
1 stop
DCA17:01Washington, D.C. Reagan-National
9 Sept
DCA15:30Washington, D.C. Reagan-National
11h 50m
1 stop
LHR08:20London Heathrow
£481
Find similar

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
6 Nov
LHR12:15London Heathrow
11h 05m
1 stop
IAD18:20Washington, D.C. Dulles Intl
10 Nov
IAD19:40Washington, D.C. Dulles Intl
18h 50m
1 stop
LHR19:30London Heathrow
£370
Find similar
Icelandair
7 Nov
LHR12:15London Heathrow
11h 05m
1 stop
IAD18:20Washington, D.C. Dulles Intl
10 Nov
IAD19:40Washington, D.C. Dulles Intl
18h 50m
1 stop
LHR19:30London Heathrow
£379
Find similar
Icelandair
23 Sept
LHR13:05London Heathrow
11h 15m
1 stop
IAD19:20Washington, D.C. Dulles Intl
30 Sept
IAD20:30Washington, D.C. Dulles Intl
18h 50m
1 stop
LHR20:20London Heathrow
£391
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 279,928 searches. Data last updated 1 August 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

Thu 23/10

08:00-20:50

1 stop17h 50m

Washington, D.C. Dulles Intl

Mon 27/10

18:30-12:40

1 stop14h 10m

£366

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 6/11

12:15-18:20

1 stop11h 05m

Washington, D.C. Dulles Intl

Mon 10/11

19:40-19:30

1 stop18h 50m

£370

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sat 27/9

17:40-13:38

2 stops24h 58m

Washington, D.C. Dulles Intl

Sun 28/9

22:15-16:40

1 stop13h 25m

£371

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 7/11

12:15-18:20

1 stop11h 05m

Washington, D.C. Dulles Intl

Mon 10/11

19:40-19:30

1 stop18h 50m

£379

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 8/10

13:25-19:30

1 stop11h 05m

Washington, D.C. Dulles Intl

Sun 30/11

17:05-08:05

1 stop10h 00m

£382

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 15/10

06:00-15:20

1 stop14h 20m

Washington, D.C. Dulles Intl

Sun 19/10

17:45-10:20

1 stop11h 35m

£383

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sun 31/8

08:50-15:50

1 stop12h 00m

Washington, D.C. Dulles Intl

Sat 13/9

20:25-12:40

1 stop11h 15m

£388

LondonWashington, D.C.

LHR - DCA

LHRDCA

London Heathrow

Wed 17/9

08:15-22:56

1 stop19h 41m

Washington, D.C. Reagan-National

Mon 22/9

17:42-20:45

1 stop22h 03m

£417

LondonWashington, D.C.

LHR - DCA

LHRDCA

London Heathrow

Tue 30/9

11:55-19:22

1 stop12h 27m

Washington, D.C. Reagan-National

Mon 6/10

06:25-20:45

1 stop9h 20m

£422

LondonWashington, D.C.

LHR - DCA

LHRDCA

London Heathrow

Sun 21/9

08:55-17:30

1 stop13h 35m

Washington, D.C. Reagan-National

Thu 2/10

13:33-07:50

1 stop13h 17m

£483

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 February. Flight prices, which tend to average around £527, are often lower during this time because this is during the off-season. If you don’t want to visit Washington, D.C. in February, then you should wait until March to fly from London Heathrow Airport, when ticket prices are also cheap, with an average price of £537.

What is the cheapest day to depart on your flight to Washington, D.C.?

On average, the least expensive day to fly to Washington, D.C. from London Heathrow Airport is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as £619. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from London Heathrow Airport because it is more convenient for both business and leisure travellers. As a result, prices tend to be around £695.

What is the cheapest time of day to depart on your flight to Washington, D.C.?

In the evening is the cheapest time of day to fly from London Heathrow Airport to Washington, D.C. when you can find flight prices for as low as £518. Flying to Washington, D.C. in the evening is an ideal time because this is during off-peak travel hours. Flights to Washington, D.C. are more costly in the afternoon, with an average ticket price of £649. Departure times in the afternoon fall within the peak daily travel times, which is why tickets can be more expensive.

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 £651 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 £546 on momondo.

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

There are 4 cabin classes 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 26% 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 August 2025, prices for London Heathrow Airport to Washington, D.C. flights are approximately 42% 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.

Best price found

£270

Fastest flight time

8h 15m

Direct flights

Every day

Airports in Washington, D.C.

3 airports
The best one-way flight to Washington, D.C. from London Heathrow Airport in the past 72 hours is £270. The best return flight deal from London Heathrow Airport to Washington, D.C. found on momondo in the last 72 hours is £366.
The fastest flight from London Heathrow Airport to Washington, D.C. takes 8h 15m
Direct flights go from London Heathrow Airport to Washington, D.C. every day.
There are 3 airports near Washington, D.C.: Washington, D.C. Reagan-National (DCA), Baltimore/Washington (BWI), Washington, D.C. Dulles Intl (IAD)
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  • How far is London Heathrow to Washington, D.C. by plane?

    The straight-line distance from London Heathrow to Washington, D.C. is 3649.4 mi. Flights usually cover this in 8h 15m, depending on flying conditions and air traffic around both airports.

  • 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 updated daily.

  • How many operators does momondo search for flights from London Heathrow Airport to Washington, D.C.?

  • 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 layovers. 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 license, 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.?

  • What is the most popular airline from London Heathrow Airport to Washington, D.C.?

Best airlines flying from London Heathrow Airport to Washington, D.C.

Compare and see reviews for airlines that fly from London Heathrow Airport to Washington, D.C. with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom £191Free CancellationRating
8.0
7,981 reviews
Search Delta flights
PLAYPriceFrom £267Free CancellationRating
7.0
102 reviews
Search PLAY flights
Air FrancePriceFrom £298Free CancellationRating
7.5
1,465 reviews
Search Air France flights
TAP AIR PORTUGALPriceFrom £358Free CancellationRating
7.1
1,933 reviews
Search TAP AIR PORTUGAL flights
IcelandairPriceFrom £369Free CancellationRating
7.0
520 reviews
Search Icelandair flights
JetBluePriceFrom £380Free CancellationRating
7.2
2,914 reviews
Search JetBlue flights
FinnairPriceFrom £444Free CancellationRating
7.6
1,316 reviews
Search Finnair flights
Scandinavian AirlinesPriceFrom £445Free CancellationRating
7.3
1,457 reviews
Search Scandinavian Airlines flights
LufthansaPriceFrom £449Free CancellationRating
6.8
7,275 reviews
Search Lufthansa flights
United AirlinesPriceFrom £453Free CancellationRating
7.4
8,900 reviews
Search United Airlines flights

  • Delta Flights From London Heathrow Airport to Washington, D.C.

    Delta flies from London Heathrow Airport to Washington, D.C. around 6 times per week, with 7,981 momondo users rating the airline 8.0/10. The cheapest Delta deal from London Heathrow Airport to Washington, D.C. in the last 72 hours was £253 (round-trip), much lower than the average airfare cost of £717 for Delta flights on this route.

  • KLM Flights From London Heathrow Airport to Washington, D.C.

    The best KLM deal for London Heathrow Airport to Washington, D.C. flight tickets found on momondo in the last 72 hours was £617, round-trip. It should be noted that an average KLM flight deal for this route in this time was higher, at £858 round-trip. KLM operates 6 flights out of London Heathrow Airport into Washington, D.C. in an average week, so prices vary by time and availability. 1,383 KLM reviews by users on momondo have scored the airline at 7.8/10.

Travelling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Laurel
Essex
Alexandria
Fairfax
Manassas
Bethesda
Oxon Hill
College Park
Linthicum Heights
Gettysburg
Hanover
Cambridge
Ellicott City
Westminster
Arlington
Woodbridge
Owings Mills
Silver Spring
National Harbor

Why use momondo?

Why should I use momondo to find a flight deal from London to Washington, D.C.?

Finding the right flight to Washington, D.C. from London is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Washington, D.C. quick and easy, saving you time and money.

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

Flights from London to Washington, D.C. with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from London to Washington, D.C.?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from London to Washington, D.C..

I’m not ready to book a flight from London to Washington, D.C. right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of London to Washington, D.C. flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Washington, D.C. trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
Start using Trips
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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 22.4 mi from Washington, D.C.
Washington, D.C. Reagan-National Airport
Washington, D.C. Dulles Intl Airport