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Cheap flights from London Heathrow Airport to Washington, D.C. from £358

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 2/2. 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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Find the cheapest flights from London Heathrow Airport to Washington, D.C.

Cheap return flights

United Airlines Logo
09:00 - 16:40LHR-IAD
12h 40m1 stop
United Airlines Logo
19:20 - 06:40IAD-LHR
7h 20mdirect
£393United Airlines
Find Deal
Tue, 3 Mar - Thu, 12 Mar
Virgin Atlantic Logo
08:40 - 00:41LHR-BWI
21h 01m2 stops
Virgin Atlantic Logo
17:30 - 08:45BWI-LHR
10h 15m1 stop
£393Virgin Atlantic
Find Deal
Mon, 3 Nov - Thu, 19 Feb
SWISS Logo
20:05 - 15:35LHR-IAD
23h 30m1 stop
SWISS Logo
20:30 - 16:20IAD-LHR
14h 50m1 stop
£394SWISS
Find Deal
Mon, 27 Oct - Fri, 7 Nov
Lufthansa Logo
11:30 - 20:15LHR-IAD
13h 45m1 stop
Lufthansa Logo
22:15 - 10:50IAD-LHR
7h 35mdirect
£397Lufthansa
Find Deal
Sat, 10 Jan - Sat, 24 Jan
British Airways Logo
16:25 - 19:55LHR-IAD
8h 30mdirect
British Airways Logo
22:45 - 10:00IAD-LHR
7h 15mdirect
£401British Airways
Find Deal
Thu, 5 Mar - Thu, 12 Mar
Icelandair Logo
12:15 - 18:40LHR-BWI
11h 25m1 stop
Icelandair Logo
19:40 - 10:50BWI-LHR
10h 10m1 stop
£401Icelandair
Find Deal
Wed, 7 Jan - Sun, 11 Jan
Icelandair Logo
20:35 - 18:40LHR-BWI
27h 05m1 stop
Icelandair Logo
19:40 - 10:50BWI-LHR
10h 10m1 stop
£403Icelandair
Find Deal
Mon, 8 Dec - Mon, 15 Dec
British Airways Logo
17:00 - 23:07LHR-DCA
11h 07m1 stop
British Airways Logo
06:38 - 21:40DCA-LHR
10h 02m1 stop
£405British Airways
Find Deal
Mon, 29 Sep - Wed, 15 Oct
Lufthansa Logo
12:15 - 15:30LHR-IAD
8h 15mdirect
Lufthansa Logo
22:25 - 10:40IAD-LHR
7h 15mdirect
£419Lufthansa
Find Deal
Fri, 26 Sep - Tue, 30 Sep
Scandinavian Airlines Logo
07:05 - 18:15LHR-IAD
15h 10m2 stops
Scandinavian Airlines Logo
21:30 - 18:30IAD-LHR
17h 00m1 stop
£421Scandinavian Airlines
Find Deal
Thu, 12 Mar - Thu, 19 Mar

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
3 Mar
LHR09:00London Heathrow
12h 40m
1 stop
IAD16:40Washington, D.C. Dulles Intl
12 Mar
IAD19:20Washington, D.C. Dulles Intl
7h 20m
LHR06:40London Heathrow
£393
Find similar
United Airlines
22 Sept
LHR06:50London Heathrow
11h 40m
1 stop
IAD13:30Washington, D.C. Dulles Intl
28 Sept
IAD18:40Washington, D.C. Dulles Intl
7h 15m
LHR06:55London Heathrow
£394
Find similar
United Airlines
2 Mar
LHR07:40London Heathrow
12h 55m
1 stop
IAD15:35Washington, D.C. Dulles Intl
12 Mar
IAD19:20Washington, D.C. Dulles Intl
7h 20m
LHR06:40London Heathrow
£395
Find similar

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

Our best SWISS deals on London Heathrow Airport to Washington, D.C. flight tickets
SWISS
27 Oct
LHR20:05London Heathrow
23h 30m
1 stop
IAD15:35Washington, D.C. Dulles Intl
7 Nov
IAD20:30Washington, D.C. Dulles Intl
14h 50m
1 stop
LHR16:20London Heathrow
£394
Find similar
SWISS
21 Nov
LHR06:00London Heathrow
15h 40m
1 stop
IAD16:40Washington, D.C. Dulles Intl
11 Dec
IAD18:20Washington, D.C. Dulles Intl
7h 20m
LHR06:40London Heathrow
£405
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 16 September 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

Tue 3/3

09:00-16:40

1 stop12h 40m

Washington, D.C. Dulles Intl

Thu 12/3

19:20-06:40

Nonstop7h 20m

£393

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Mon 3/11

08:40-00:41

2 stops21h 01m

Baltimore/Washington

Thu 19/2

17:30-08:45

1 stop10h 15m

£393

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 27/10

20:05-15:35

1 stop23h 30m

Washington, D.C. Dulles Intl

Fri 7/11

20:30-16:20

1 stop14h 50m

£394

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sat 10/1

11:30-20:15

1 stop13h 45m

Washington, D.C. Dulles Intl

Sat 24/1

22:15-10:50

Nonstop7h 35m

£397

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 5/3

16:25-19:55

Nonstop8h 30m

Washington, D.C. Dulles Intl

Thu 12/3

22:45-10:00

Nonstop7h 15m

£401

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Wed 7/1

12:15-18:40

1 stop11h 25m

Baltimore/Washington

Sun 11/1

19:40-10:50

1 stop10h 10m

£401

LondonBaltimore

LHR - BWI

LHRBWI

London Heathrow

Mon 8/12

20:35-18:40

1 stop27h 05m

Baltimore/Washington

Mon 15/12

19:40-10:50

1 stop10h 10m

£403

LondonWashington, D.C.

LHR - DCA

LHRDCA

London Heathrow

Mon 29/9

17:00-23:07

1 stop11h 07m

Washington, D.C. Reagan-National

Wed 15/10

06:38-21:40

1 stop10h 02m

£405

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 26/9

12:15-15:30

Nonstop8h 15m

Washington, D.C. Dulles Intl

Tue 30/9

22:25-10:40

Nonstop7h 15m

£419

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 12/3

07:05-18:15

2 stops15h 10m

Washington, D.C. Dulles Intl

Thu 19/3

21:30-18:30

1 stop17h 00m

£421

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 September. Flight prices, which tend to average around £486, are often lower during this time because this is during the off-season. If you don’t want to visit Washington, D.C. in September, then you should wait until February to fly from London Heathrow Airport, when ticket prices are also cheap, with an average price of £513.

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 £592. 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 £666.

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 £505. 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 £625. 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 £575 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 £538 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 18% 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 September 2025, prices for London Heathrow Airport to Washington, D.C. flights are approximately 30% 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

£470

Fastest flight time

8h 05m

Direct flights

Every day

Airports in Washington, D.C.

2 airports
The best one-way flight to Washington, D.C. from London Heathrow Airport in the past 72 hours is £470. The best return flight deal from London Heathrow Airport to Washington, D.C. found on momondo in the last 72 hours is £469.
The fastest flight from London Heathrow Airport to Washington, D.C. takes 8h 05m
Direct flights go from London Heathrow Airport to Washington, D.C. every day.
There are 2 airports near Washington, D.C.: Baltimore/Washington (BWI), Washington, D.C. Dulles Intl (IAD)
Search flight deals

  • 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 £186Free CancellationRating
7.9
7,954 reviews
Search Delta flights
PLAYPriceFrom £242Free CancellationRating
7.0
103 reviews
Search PLAY flights
TAP AIR PORTUGALPriceFrom £349Free CancellationRating
7.1
1,975 reviews
Search TAP AIR PORTUGAL flights
IcelandairPriceFrom £358Free CancellationRating
7.0
544 reviews
Search Icelandair flights
JetBluePriceFrom £370Free CancellationRating
7.2
2,912 reviews
Search JetBlue flights
Aer LingusPriceFrom £393Free CancellationRating
7.2
1,270 reviews
Search Aer Lingus flights
United AirlinesPriceFrom £394Free CancellationRating
7.4
8,929 reviews
Search United Airlines flights
FinnairPriceFrom £429Free CancellationRating
7.6
1,323 reviews
Search Finnair flights
LufthansaPriceFrom £432Free CancellationRating
6.8
7,407 reviews
Search Lufthansa flights
Scandinavian AirlinesPriceFrom £432Free CancellationRating
7.4
1,484 reviews
Search Scandinavian 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 7,954 momondo users rating the airline 7.9/10. 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 £600, round-trip. It should be noted that an average KLM flight deal for this route in this time was higher, at £898 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. 1,385 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
College Park
Essex
Alexandria
Fairfax
Bethesda
Oxon Hill
Gettysburg
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.
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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