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Cheap flights from London Heathrow Airport to Washington, D.C. from £376

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 18/1. 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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Cheap return flights

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TAP AIR PORTUGAL Logo
16:30 - 21:00LHR-IAD
33h 30m1 stop
TAP AIR PORTUGAL Logo
22:30 - 17:30IAD-LHR
14h 00m1 stop
£409TAP AIR PORTUGAL
Find Deal
Thu, 22 Jan - Sun, 25 Jan
TAP AIR PORTUGAL Logo
08:15 - 21:00LHR-IAD
17h 45m1 stop
TAP AIR PORTUGAL Logo
22:30 - 21:35IAD-LHR
18h 05m1 stop
£411TAP AIR PORTUGAL
Find Deal
Wed, 3 Dec - Fri, 12 Dec
TAP AIR PORTUGAL Logo
11:20 - 20:35LHR-IAD
14h 15m1 stop
TAP AIR PORTUGAL Logo
22:35 - 18:50IAD-LHR
15h 15m1 stop
£414TAP AIR PORTUGAL
Find Deal
Wed, 1 Apr - Sat, 11 Apr
Scandinavian Airlines Logo
10:20 - 18:50LHR-IAD
13h 30m1 stop
Scandinavian Airlines Logo
20:30 - 16:00IAD-LHR
14h 30m1 stop
£437Scandinavian Airlines
Find Deal
Sat, 10 Jan - Sat, 24 Jan
Scandinavian Airlines Logo
10:20 - 17:15LHR-IAD
11h 55m1 stop
Scandinavian Airlines Logo
20:30 - 09:20IAD-LHR
31h 50m1 stop
£438Scandinavian Airlines
Find Deal
Mon, 2 Feb - Mon, 9 Feb
Icelandair Logo
12:15 - 18:30LHR-IAD
11h 15m1 stop
Icelandair Logo
19:40 - 10:50IAD-LHR
10h 10m1 stop
£461Icelandair
Find Deal
Thu, 27 Nov - Wed, 17 Dec
Icelandair Logo
12:15 - 18:30LHR-IAD
11h 15m1 stop
Icelandair Logo
19:40 - 10:50IAD-LHR
10h 10m1 stop
£462Icelandair
Find Deal
Tue, 25 Nov - Tue, 9 Dec
Multiple Airlines Logo
07:50 - 18:30LHR-IAD
15h 40m2 stops
Multiple Airlines Logo
19:40 - 15:35IAD-LHR
14h 55m2 stops
£464Multiple Airlines
Find Deal
Fri, 5 Dec - Tue, 9 Dec
Virgin Atlantic Logo
17:50 - 16:05LHR-IAD
27h 15m1 stop
Virgin Atlantic Logo
22:20 - 10:50IAD-LHR
7h 30mdirect
£465Virgin Atlantic
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Wed, 26 Nov - Sun, 7 Dec
Virgin Atlantic Logo
10:00 - 16:05LHR-IAD
11h 05m1 stop
Virgin Atlantic Logo
22:20 - 10:50IAD-LHR
7h 30mdirect
£466Virgin Atlantic
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Thu, 27 Nov - Thu, 4 Dec

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

Our best Scandinavian Airlines deals on London Heathrow Airport to Washington, D.C. Dulles Intl Airport flight tickets
Scandinavian Airlines
10 Jan
LHR10:20London Heathrow
13h 30m
1 stop
IAD18:50Washington, D.C. Dulles Intl
24 Jan
IAD20:30Washington, D.C. Dulles Intl
14h 30m
1 stop
LHR16:00London Heathrow
£437
Find similar
Scandinavian Airlines
2 Feb
LHR10:20London Heathrow
11h 55m
1 stop
IAD17:15Washington, D.C. Dulles Intl
9 Feb
IAD20:30Washington, D.C. Dulles Intl
31h 50m
1 stop
LHR09:20London Heathrow
£438
Find similar
Scandinavian Airlines
18 Feb
LHR17:00London Heathrow
29h 15m
1 stop
IAD17:15Washington, D.C. Dulles Intl
28 Feb
IAD20:30Washington, D.C. Dulles Intl
14h 30m
1 stop
LHR16:00London Heathrow
£439
Find similar

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
27 Nov
LHR12:15London Heathrow
11h 15m
1 stop
IAD18:30Washington, D.C. Dulles Intl
17 Dec
IAD19:40Washington, D.C. Dulles Intl
10h 10m
1 stop
LHR10:50London Heathrow
£461
Find similar
Icelandair
25 Nov
LHR12:15London Heathrow
11h 15m
1 stop
IAD18:30Washington, D.C. Dulles Intl
9 Dec
IAD19:40Washington, D.C. Dulles Intl
10h 10m
1 stop
LHR10:50London Heathrow
£462
Find similar
Icelandair
27 Nov
LHR12:15London Heathrow
11h 15m
1 stop
IAD18:30Washington, D.C. Dulles Intl
4 Dec
IAD19:40Washington, D.C. Dulles Intl
10h 10m
1 stop
LHR10:50London Heathrow
£464
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 30 October 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 22/1

16:30-21:00

1 stop33h 30m

Washington, D.C. Dulles Intl

Sun 25/1

22:30-17:30

1 stop14h 00m

£409

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 3/12

08:15-21:00

1 stop17h 45m

Washington, D.C. Dulles Intl

Fri 12/12

22:30-21:35

1 stop18h 05m

£411

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 1/4

11:20-20:35

1 stop14h 15m

Washington, D.C. Dulles Intl

Sat 11/4

22:35-18:50

1 stop15h 15m

£414

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Sat 10/1

10:20-18:50

1 stop13h 30m

Washington, D.C. Dulles Intl

Sat 24/1

20:30-16:00

1 stop14h 30m

£437

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Mon 2/2

10:20-17:15

1 stop11h 55m

Washington, D.C. Dulles Intl

Mon 9/2

20:30-09:20

1 stop31h 50m

£438

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 27/11

12:15-18:30

1 stop11h 15m

Washington, D.C. Dulles Intl

Wed 17/12

19:40-10:50

1 stop10h 10m

£461

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Tue 25/11

12:15-18:30

1 stop11h 15m

Washington, D.C. Dulles Intl

Tue 9/12

19:40-10:50

1 stop10h 10m

£462

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Fri 5/12

07:50-18:30

2 stops15h 40m

Washington, D.C. Dulles Intl

Tue 9/12

19:40-15:35

2 stops14h 55m

£464

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Wed 26/11

17:50-16:05

1 stop27h 15m

Washington, D.C. Dulles Intl

Sun 7/12

22:20-10:50

Nonstop7h 30m

£465

LondonWashington, D.C.

LHR - IAD

LHRIAD

London Heathrow

Thu 27/11

10:00-16:05

1 stop11h 05m

Washington, D.C. Dulles Intl

Thu 4/12

22:20-10:50

Nonstop7h 30m

£466

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. 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 September is, on average, the cheapest month to fly to Washington, D.C. Dulles Intl Airport from London Heathrow Airport, with most prices found around £489. If you aren’t able to travel during the month of September, then book flights to Washington, D.C. Dulles Intl Airport from London Heathrow Airport during February instead. Flights to Washington, D.C. Dulles Intl Airport in February, while not as cheap as those in September, still average around £514.

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 £611. 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 £690.

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 £536. 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 £643.

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 £591 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 £557 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?

No. A direct flight is the cheapest option for a flight between London Heathrow Airport to Washington, D.C. Dulles Intl Airport.

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

As of October 2025, prices for London Heathrow Airport to Washington, D.C. Dulles Intl Airport flights are approximately 69% 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

£463

Fastest flight time

8h 05m

Direct flights

Mon, Tue, Wed, Thu, Fri and Sat
The best one-way flight to Washington, D.C. Dulles Intl Airport from London Heathrow Airport in the past 72 hours is £463. 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 £523.
The fastest flight from London Heathrow Airport to Washington, D.C. Dulles Intl Airport takes 8h 05m
Direct flights go from London Heathrow Airport to Washington, D.C. Dulles Intl Airport on Monday, Tuesday, Wednesday, Thursday, Friday and Saturday. There are no airlines offering direct flights..
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  • 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 11h 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 £191Free CancellationRating
7.9
7,993 reviews
Search Delta flights
TAP AIR PORTUGALPriceFrom £359Free CancellationRating
7.1
2,037 reviews
Search TAP AIR PORTUGAL flights
IcelandairPriceFrom £379Free CancellationRating
7.1
562 reviews
Search Icelandair flights
Aer LingusPriceFrom £393Free CancellationRating
7.2
1,361 reviews
Search Aer Lingus flights
United AirlinesPriceFrom £412Free CancellationRating
7.4
8,998 reviews
Search United Airlines flights
FinnairPriceFrom £428Free CancellationRating
7.6
1,333 reviews
Search Finnair flights
LufthansaPriceFrom £433Free CancellationRating
6.8
7,541 reviews
Search Lufthansa flights
Scandinavian AirlinesPriceFrom £438Free CancellationRating
7.4
1,545 reviews
Search Scandinavian Airlines flights
Virgin AtlanticPriceFrom £440Free CancellationRating
7.5
670 reviews
Search Virgin Atlantic flights
KLMPriceFrom £444Free CancellationRating
7.7
1,406 reviews
Search KLM 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 4 times per week, with 7,992 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 £191 (round-trip), much lower than the average airfare cost of £525 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 £444, round-trip. It should be noted that an average KLM flight deal for this route in this time was higher, at £605 round-trip. KLM operates 4 flights out of London Heathrow Airport into Washington, D.C. Dulles Intl Airport in an average week, so prices vary by time and availability. 1,406 KLM reviews by users on momondo have scored the airline at 7.7/10.

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
Alexandria
Fairfax
Linthicum Heights
Bethesda
Front Royal
Cambridge
Winchester
Ellicott City
Westminster
Arlington
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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