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Cheap flights from London Heathrow Airport to Washington, D.C. from £374

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 22/9. 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

Logo
06:55 - 19:25LHR-IAD
17h 30m1 stop
Logo
17:37 - 06:30IAD-LHR
31h 53m1 stop
£392
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Fri, 26 Sep - Sat, 4 Oct
United Airlines Logo
09:00 - 17:40LHR-IAD
12h 40m1 stop
United Airlines Logo
17:33 - 09:10IAD-LHR
10h 37m1 stop
£394United Airlines
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Tue, 28 Oct - Tue, 11 Nov
Virgin Atlantic Logo
08:40 - 23:03LHR-IAD
19h 23m2 stops
Virgin Atlantic Logo
10:08 - 06:45IAD-LHR
15h 37m2 stops
£394Virgin Atlantic
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Thu, 13 Nov - Thu, 18 Dec
British Airways Logo
16:25 - 19:55LHR-IAD
8h 30mdirect
British Airways Logo
18:20 - 06:30IAD-LHR
7h 10mdirect
£400British Airways
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Fri, 21 Nov - Tue, 25 Nov
British Airways Logo
16:25 - 19:55LHR-IAD
8h 30mdirect
British Airways Logo
18:20 - 06:30IAD-LHR
7h 10mdirect
£401British Airways
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Fri, 14 Nov - Fri, 28 Nov
Virgin Atlantic Logo
12:35 - 16:00LHR-IAD
8h 25mdirect
Virgin Atlantic Logo
18:45 - 07:15IAD-LHR
7h 30mdirect
£404Virgin Atlantic
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Thu, 2 Oct - Sat, 18 Oct
Austrian Airlines Logo
06:00 - 14:40LHR-IAD
13h 40m1 stop
Austrian Airlines Logo
18:20 - 06:40IAD-LHR
7h 20mdirect
£405Austrian Airlines
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Mon, 1 Dec - Mon, 8 Dec
Icelandair Logo
21:25 - 19:20LHR-IAD
26h 55m1 stop
Icelandair Logo
20:30 - 20:20IAD-LHR
18h 50m1 stop
£406Icelandair
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Mon, 29 Sep - Fri, 3 Oct
Icelandair Logo
21:25 - 19:20LHR-IAD
26h 55m1 stop
Icelandair Logo
20:30 - 11:55IAD-LHR
10h 25m1 stop
£412Icelandair
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Mon, 29 Sep - Sat, 4 Oct
Austrian Airlines Logo
06:00 - 15:40LHR-IAD
13h 40m1 stop
Austrian Airlines Logo
18:20 - 06:40IAD-LHR
7h 20mdirect
£413Austrian Airlines
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Fri, 31 Oct - Mon, 3 Nov

Brussels Airlines flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport

Our best Brussels Airlines deals on London Heathrow Airport to Washington, D.C. Dulles Intl Airport flight tickets
Brussels Airlines
18 Sept
LHR07:45London Heathrow
10h 45m
1 stop
IAD13:30Washington, D.C. Dulles Intl
2 Nov
IAD15:59Washington, D.C. Dulles Intl
36h 41m
1 stop
LHR09:40London Heathrow
£403
Find similar
Brussels Airlines
27 Oct
LHR17:50London Heathrow
25h 45m
1 stop
IAD15:35Washington, D.C. Dulles Intl
12 Dec
IAD17:15Washington, D.C. Dulles Intl
35h 25m
1 stop
LHR09:40London Heathrow
£413
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American Airlines flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport

Our best American Airlines deals on London Heathrow Airport to Washington, D.C. Dulles Intl Airport flight tickets
American Airlines
21 Nov
LHR16:25London Heathrow
8h 30m
IAD19:55Washington, D.C. Dulles Intl
2 Dec
IAD21:45Washington, D.C. Dulles Intl
7h 15m
LHR10:00London Heathrow
£416
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American Airlines
3 Oct
LHR11:00London Heathrow
12h 51m
1 stop
IAD18:51Washington, D.C. Dulles Intl
6 Oct
IAD17:41Washington, D.C. Dulles Intl
10h 24m
1 stop
LHR09:05London Heathrow
£427
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momondo Fare Finder

 
Customise your flight search to find flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport 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 12 September 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 26/9

06:55-19:25

1 stop17h 30m

Washington, D.C. Dulles Intl

Sat 4/10

17:37-06:30

1 stop31h 53m

£392

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Tue 28/10

09:00-17:40

1 stop12h 40m

Washington, D.C. Dulles Intl

Tue 11/11

17:33-09:10

1 stop10h 37m

£394

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 13/11

08:40-23:03

2 stops19h 23m

Washington, D.C. Dulles Intl

Thu 18/12

10:08-06:45

2 stops15h 37m

£394

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 21/11

16:25-19:55

Nonstop8h 30m

Washington, D.C. Dulles Intl

Tue 25/11

18:20-06:30

Nonstop7h 10m

£400

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 14/11

16:25-19:55

Nonstop8h 30m

Washington, D.C. Dulles Intl

Fri 28/11

18:20-06:30

Nonstop7h 10m

£401

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 2/10

12:35-16:00

Nonstop8h 25m

Washington, D.C. Dulles Intl

Sat 18/10

18:45-07:15

Nonstop7h 30m

£404

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 1/12

06:00-14:40

1 stop13h 40m

Washington, D.C. Dulles Intl

Mon 8/12

18:20-06:40

Nonstop7h 20m

£405

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 29/9

21:25-19:20

1 stop26h 55m

Washington, D.C. Dulles Intl

Fri 3/10

20:30-20:20

1 stop18h 50m

£406

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 29/9

21:25-19:20

1 stop26h 55m

Washington, D.C. Dulles Intl

Sat 4/10

20:30-11:55

1 stop10h 25m

£412

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 31/10

06:00-15:40

1 stop13h 40m

Washington, D.C. Dulles Intl

Mon 3/11

18:20-06:40

Nonstop7h 20m

£413

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from London Heathrow Airport to Washington, D.C. Dulles Intl Airport

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. Dulles Intl Airport?

The month of February is, on average, the cheapest month to fly to Washington, D.C. Dulles Intl Airport from London Heathrow Airport, with most prices found around £506. If you aren’t able to travel during the month of February, then book flights to Washington, D.C. Dulles Intl Airport from London Heathrow Airport during March instead. Flights to Washington, D.C. Dulles Intl Airport in March, while not as cheap as those in February, still average around £518.

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

According to our data, Wednesday is the cheapest day to fly to Washington, D.C. Dulles Intl Airport from London Heathrow Airport. The lowest ticket price found for a Wednesday departure recently was £594. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. 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 £672.

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

The cheapest time of day to fly to Washington, D.C. Dulles Intl Airport is in the evening when flights can be purchased for as low as £523. In contrast, the most expensive time of day to depart to Washington, D.C. Dulles Intl Airport is in the afternoon when prices are around £627.

What is the cheapest London Heathrow to Washington, D.C. Dulles Intl flight route?

Fly from London Heathrow to Washington, D.C. Dulles Intl for the best London Heathrow - Washington, D.C. Dulles Intl flight prices

How far in advance should I book a flight to Washington, D.C. Dulles Intl Airport?

You are more likely to see cheaper flights to Washington, D.C. Dulles Intl Airport from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. Dulles Intl Airport for around £586 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. Dulles Intl Airport from London Heathrow Airport for as low as £538 on momondo.

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

There are 4 cabin classes available to choose from on London Heathrow to Washington, D.C. Dulles Intl 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. Dulles Intl Airport flights?

You could potentially save up to 1% on your flight if you consider stops on a London Heathrow Airport to Washington, D.C. Dulles Intl Airport flight.

How have London Heathrow Airport to Washington, D.C. Dulles Intl Airport flight prices changed over time?

As of September 2025, prices for London Heathrow Airport to Washington, D.C. Dulles Intl Airport flights are approximately 24% more expensive when compared to flights at the same time last year.

When to book flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from London Heathrow Airport to Washington, D.C. Dulles Intl Airport 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. Dulles Intl Airport (LHR to IAD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport

Best price found

£545

Fastest flight time

8h 10m

Direct flights

Every day
The best one-way flight to Washington, D.C. Dulles Intl Airport from London Heathrow Airport in the past 72 hours is £545. The best return flight deal from London Heathrow Airport to Washington, D.C. Dulles Intl Airport found on momondo in the last 72 hours is £482.
The fastest flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport takes 8h 10m
Direct flights go from London Heathrow Airport to Washington, D.C. Dulles Intl Airport every day.
Search flight deals

  • How far is London Heathrow to Washington, D.C. Dulles Intl by plane?

    London Heathrow and Washington, D.C. Dulles Intl are 3664.4 mi apart from one another. A reasonable flight in good conditions will take 8h 05m.

  • When did momondo last update prices for flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?

    Prices for flights from London Heathrow Airport to Washington, D.C. Dulles Intl Airport were last updated today.

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

  • How old do you have to be to fly from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, 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. Dulles Intl Airport.

  • What documentation or ID do you need to fly to Washington, D.C. Dulles Intl Airport?

    The travel and health documents you'll need for your trip to Washington, D.C. Dulles Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Washington, D.C. Dulles Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from London Heathrow Airport to Washington, D.C. Dulles Intl Airport?

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

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

Compare and see reviews for airlines that fly from London Heathrow Airport to Washington, D.C. Dulles Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom £187Free CancellationRating
7.9
7,960 reviews
Search Delta flights
PLAYPriceFrom £243Free CancellationRating
7.0
103 reviews
Search PLAY flights
TAP AIR PORTUGALPriceFrom £350Free CancellationRating
7.1
1,977 reviews
Search TAP AIR PORTUGAL flights
IcelandairPriceFrom £370Free CancellationRating
7.0
546 reviews
Search Icelandair flights
Aer LingusPriceFrom £400Free CancellationRating
7.2
1,271 reviews
Search Aer Lingus flights
United AirlinesPriceFrom £428Free CancellationRating
7.4
8,937 reviews
Search United Airlines flights
FinnairPriceFrom £430Free CancellationRating
7.6
1,323 reviews
Search Finnair flights
LufthansaPriceFrom £434Free CancellationRating
6.8
7,409 reviews
Search Lufthansa flights
Scandinavian AirlinesPriceFrom £434Free CancellationRating
7.4
1,484 reviews
Search Scandinavian Airlines flights
Air FrancePriceFrom £435Free CancellationRating
7.4
1,469 reviews
Search Air France flights

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

    Delta flies from London Heathrow Airport to Washington, D.C. Dulles Intl Airport around 7 times per week, with 7,960 momondo users rating the airline 7.9/10. The cheapest Delta deal from London Heathrow Airport to Washington, D.C. Dulles Intl Airport 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. Dulles Intl Airport

    The best KLM deal for London Heathrow Airport to Washington, D.C. Dulles Intl Airport flight tickets found on momondo in the last 72 hours was £603, round-trip. It should be noted that an average KLM flight deal for this route in this time was higher, at £830 round-trip. KLM operates 7 flights out of London Heathrow Airport into Washington, D.C. Dulles Intl Airport 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
Winchester
Laurel
Essex
Alexandria
Fairfax
Manassas
Bethesda
Oxon Hill
Gettysburg
Front Royal
Cambridge
Ellicott City
Arlington
Westminster
Ashburn
Woodbridge
Owings Mills
Sterling
Silver Spring
National Harbor

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from London to Washington, D.C. for you.

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

momondo does allow users to show only those flights to Washington, D.C. from London which offer a flexible booking policy as well as other useful filters and features.

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?

Price alerts on flights to Washington, D.C. from London are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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