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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
TAP AIR PORTUGAL Logo
19:50 - 15:20LHR-IAD
24h 30m1 stop
TAP AIR PORTUGAL Logo
22:20 - 22:00IAD-LHR
18h 40m1 stop
£385TAP 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
Aer Lingus Logo
12:10 - 19:30LHR-IAD
12h 20m1 stop
Aer Lingus Logo
21:00 - 11:25IAD-LHR
9h 25m1 stop
£390Aer Lingus
Find Deal
Tue, 25 Nov - Tue, 2 Dec
United Airlines Logo
12:15 - 15:30LHR-IAD
8h 15mdirect
United Airlines Logo
17:37 - 06:30IAD-LHR
31h 53m1 stop
£422United Airlines
Find Deal
Sat, 13 Sep - Sat, 13 Sep

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

Our best Icelandair deals on London Heathrow Airport to Washington, D.C. Dulles Intl Airport 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

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

Our best United Airlines deals on London Heathrow Airport to Washington, D.C. Dulles Intl Airport 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
6 Aug
LHR08:30London Heathrow
11h 45m
1 stop
IAD15:15Washington, D.C. Dulles Intl
14 Aug
IAD06:15Washington, D.C. Dulles Intl
9h 25m
1 stop
LHR20:40London Heathrow
£533
Find similar

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 1 August 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

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

Wed 15/10

19:50-15:20

1 stop24h 30m

Washington, D.C. Dulles Intl

Sun 19/10

22:20-22:00

1 stop18h 40m

£385

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 - IAD

LHRIAD

London Heathrow

Tue 25/11

12:10-19:30

1 stop12h 20m

Washington, D.C. Dulles Intl

Tue 2/12

21:00-11:25

1 stop9h 25m

£390

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sat 13/9

12:15-15:30

Nonstop8h 15m

Washington, D.C. Dulles Intl

Sat 13/9

17:37-06:30

1 stop31h 53m

£422

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 £518. 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 £530.

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 £619. 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 £695.

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 £535. 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 £649.

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 £613 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 £552 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.

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

As of August 2025, prices for London Heathrow Airport to Washington, D.C. Dulles Intl Airport flights are approximately 32% 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

£270

Fastest flight time

8h 15m

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 £270. 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 £366.
The fastest flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport takes 8h 15m
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 15m.

  • 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 £191Free CancellationRating
8.0
7,981 reviews
Search Delta flights
PLAYPriceFrom £267Free CancellationRating
7.0
102 reviews
Search PLAY flights
TAP AIR PORTUGALPriceFrom £358Free CancellationRating
7.1
1,933 reviews
Search TAP AIR PORTUGAL flights
IcelandairPriceFrom £387Free CancellationRating
7.0
520 reviews
Search Icelandair 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
Air FrancePriceFrom £445Free CancellationRating
7.5
1,465 reviews
Search Air France 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
Virgin AtlanticPriceFrom £462Free CancellationRating
7.4
655 reviews
Search Virgin Atlantic 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 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. 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 £629, round-trip. It should be noted that an average KLM flight deal for this route in this time was higher, at £841 round-trip. KLM operates 6 flights out of London Heathrow Airport into Washington, D.C. Dulles Intl Airport in an average week, so prices vary by time and availability. 1,383 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
Winchester
Laurel
Essex
Alexandria
Fairfax
Manassas
Bethesda
Oxon Hill
Chantilly
College Park
Linthicum Heights
Gettysburg
Front Royal
Hanover
Cambridge
Ellicott City
Westminster
Arlington
Ashburn
Woodbridge

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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