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Cheap flights from Washington, D.C. Dulles Intl Airport to London from £249

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. Dulles Intl Airport to London departing on 27/2. 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 Washington, D.C. Dulles Intl Airport to London

Cheap return flights

Enter your travel dates to find the best prices.
Icelandair Logo
20:30 - 11:55
IAD
-
LHR
10h 25m
1 stop
Icelandair Logo
21:25 - 19:20
LHR
-
IAD
26h 55m
1 stop
£379Icelandair
Fri, 3 Apr - Wed, 8 Apr
Icelandair Logo
20:30 - 11:55
IAD
-
LHR
10h 25m
1 stop
Icelandair Logo
21:25 - 19:20
LHR
-
IAD
26h 55m
1 stop
£380Icelandair
Fri, 3 Apr - Sun, 12 Apr
Icelandair Logo
20:30 - 11:55
IAD
-
LHR
10h 25m
1 stop
Icelandair Logo
21:25 - 19:20
LHR
-
IAD
26h 55m
1 stop
£381Icelandair
Sat, 11 Apr - Fri, 17 Apr
Icelandair Logo
20:30 - 11:55
IAD
-
LHR
10h 25m
1 stop
Icelandair Logo
13:05 - 19:20
LHR
-
IAD
11h 15m
1 stop
£382Icelandair
Sat, 4 Apr - Tue, 14 Apr
Icelandair Logo
20:30 - 11:55
IAD
-
LHR
10h 25m
1 stop
Icelandair Logo
13:05 - 19:20
LHR
-
IAD
11h 15m
1 stop
£382Icelandair
Wed, 15 Apr - Tue, 5 May
Icelandair Logo
20:30 - 11:55
IAD
-
LHR
10h 25m
1 stop
Icelandair Logo
21:25 - 19:20
LHR
-
IAD
26h 55m
1 stop
£383Icelandair
Fri, 3 Apr - Mon, 13 Apr
Icelandair Logo
19:40 - 10:50
IAD
-
LHR
10h 10m
1 stop
Icelandair Logo
12:15 - 19:30
LHR
-
IAD
11h 15m
1 stop
£384Icelandair
Sun, 1 Mar - Tue, 10 Mar
Icelandair Logo
19:40 - 10:50
IAD
-
LHR
10h 10m
1 stop
Icelandair Logo
12:15 - 18:30
LHR
-
IAD
11h 15m
1 stop
£384Icelandair
Sun, 8 Feb - Wed, 25 Feb
Icelandair Logo
19:40 - 10:50
IAD
-
LHR
10h 10m
1 stop
Icelandair Logo
12:15 - 18:30
LHR
-
IAD
11h 15m
1 stop
£385Icelandair
Sat, 7 Feb - Sun, 22 Feb
Icelandair Logo
19:40 - 10:50
IAD
-
LHR
10h 10m
1 stop
Icelandair Logo
20:35 - 18:30
LHR
-
IAD
26h 55m
1 stop
£386Icelandair
Sat, 14 Feb - Sun, 1 Mar

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

Our best Scandinavian Airlines deals on Washington, D.C. Dulles Intl Airport to London Heathrow Airport flight tickets
Scandinavian Airlines
26 Feb
IAD20:30Washington, D.C. Dulles Intl
14h 55m
2 stops
LHR16:25London Heathrow
5 Mar
LHR06:40London Heathrow
15h 35m
1 stop
IAD17:15Washington, D.C. Dulles Intl
£400
Scandinavian Airlines
25 Feb
IAD20:30Washington, D.C. Dulles Intl
16h 10m
1 stop
LHR17:40London Heathrow
4 Mar
LHR07:05London Heathrow
15h 10m
2 stops
IAD17:15Washington, D.C. Dulles Intl
£400
Scandinavian Airlines
26 Feb
IAD20:30Washington, D.C. Dulles Intl
14h 30m
1 stop
LHR16:00London Heathrow
5 Mar
LHR10:20London Heathrow
11h 55m
1 stop
IAD17:15Washington, D.C. Dulles Intl
£404

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

Our best Icelandair deals on Washington, D.C. Dulles Intl Airport to London Heathrow Airport flight tickets
Icelandair
3 Apr
IAD20:30Washington, D.C. Dulles Intl
10h 25m
1 stop
LHR11:55London Heathrow
8 Apr
LHR21:25London Heathrow
26h 55m
1 stop
IAD19:20Washington, D.C. Dulles Intl
£379
Icelandair
12 Apr
IAD20:30Washington, D.C. Dulles Intl
10h 25m
1 stop
LHR11:55London Heathrow
28 Apr
LHR13:05London Heathrow
11h 15m
1 stop
IAD19:20Washington, D.C. Dulles Intl
£380
Icelandair
11 Apr
IAD20:30Washington, D.C. Dulles Intl
10h 25m
1 stop
LHR11:55London Heathrow
17 Apr
LHR21:25London Heathrow
26h 55m
1 stop
IAD19:20Washington, D.C. Dulles Intl
£381

momondo Fare Finder

 
Customise your flight search to find flights from Washington, D.C. Dulles Intl Airport to London Heathrow 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 28 January 2026.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 3/4

20:30-11:55

1 stop10h 25m

London Heathrow

Wed 8/4

21:25-19:20

1 stop26h 55m

£379

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 3/4

20:30-11:55

1 stop10h 25m

London Heathrow

Sun 12/4

21:25-19:20

1 stop26h 55m

£380

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 11/4

20:30-11:55

1 stop10h 25m

London Heathrow

Fri 17/4

21:25-19:20

1 stop26h 55m

£381

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 4/4

20:30-11:55

1 stop10h 25m

London Heathrow

Tue 14/4

13:05-19:20

1 stop11h 15m

£382

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 15/4

20:30-11:55

1 stop10h 25m

London Heathrow

Tue 5/5

13:05-19:20

1 stop11h 15m

£382

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 3/4

20:30-11:55

1 stop10h 25m

London Heathrow

Mon 13/4

21:25-19:20

1 stop26h 55m

£383

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 1/3

19:40-10:50

1 stop10h 10m

London Heathrow

Tue 10/3

12:15-19:30

1 stop11h 15m

£384

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 8/2

19:40-10:50

1 stop10h 10m

London Heathrow

Wed 25/2

12:15-18:30

1 stop11h 15m

£384

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 7/2

19:40-10:50

1 stop10h 10m

London Heathrow

Sun 22/2

12:15-18:30

1 stop11h 15m

£385

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 14/2

19:40-10:50

1 stop10h 10m

London Heathrow

Sun 1/3

20:35-18:30

1 stop26h 55m

£386

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to London from

How to get the cheapest flight ticket from Washington, D.C. Dulles Intl Airport to London Heathrow 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 London Heathrow Airport?

In general, August is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £489. The month of September is another great option to travel to London Heathrow Airport, with average flight prices from Washington, D.C. Dulles Intl Airport averaging around £497.

What is the cheapest day to depart on your flight to London Heathrow Airport?

On average, the least expensive day to fly to London Heathrow Airport from Washington, D.C. Dulles Intl Airport is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as £527. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Thursday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Thursday is £599.

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the afternoon. momondo users have found flights departing from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in the afternoon for as low as £541. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are £560 on average. Flights to London Heathrow Airport from Washington, D.C. Dulles Intl Airport in the evening are generally more expensive because this time of day is more convenient for travellers’ schedules.

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

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

How far in advance should I book a flight to London Heathrow Airport?

You are more likely to see cheaper flights to London Heathrow Airport from Washington, D.C. Dulles Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £549 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from Washington, D.C. Dulles Intl Airport for as low as £514 on momondo.

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

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

You could potentially save up to 4% on your flight if you consider stops on a Washington, D.C. Dulles Intl Airport to London Heathrow Airport flight.

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

As of January 2026, prices for Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights are approximately 69% more expensive when compared to flights at the same time last year.

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

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap Washington, D.C. Dulles Intl Airport to London Heathrow Airport (IAD to LHR) flight deals and tips

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

Best price found

£327

Fastest flight time

7h 10m

Direct flights

Every day
The best one-way flight to London Heathrow Airport from Washington, D.C. Dulles Intl Airport in the past 72 hours is £327. The best return flight deal from Washington, D.C. Dulles Intl Airport to London Heathrow Airport found on momondo in the last 72 hours is £453.
The fastest flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport takes 7h 10m
Direct flights go from Washington, D.C. Dulles Intl Airport to London Heathrow Airport every day.
Search flight deals

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

    London Heathrow is 3664.4 mi away from Washington, D.C. Dulles Intl. In terms of flight time, this usually takes a little over 7h 10m.

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

    Prices for flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport are refreshed on a daily basis.

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

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

  • What documentation or ID do you need to fly to London Heathrow Airport?

    The travel and health documents required for your trip to London Heathrow Airport 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 London Heathrow Airport. 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 Washington, D.C. Dulles Intl Airport to London Heathrow Airport?

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

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

Compare and see reviews for airlines that fly from Washington, D.C. Dulles Intl Airport to London Heathrow Airport with momondo
Airline
Rating
Free Cancellation
Price
LufthansaPriceFrom £302Free CancellationRating
6.8
7,749 reviews
Search Lufthansa flights
IcelandairPriceFrom £360Free CancellationRating
7.1
603 reviews
Search Icelandair flights
Virgin AtlanticPriceFrom £373Free CancellationRating
7.5
678 reviews
Search Virgin Atlantic flights
British AirwaysPriceFrom £377Free CancellationRating
6.7
7,704 reviews
Search British Airways flights
Air FrancePriceFrom £388Free CancellationRating
7.4
1,528 reviews
Search Air France flights
IberiaPriceFrom £447Free CancellationRating
7.0
3,099 reviews
Search Iberia flights
United AirlinesPriceFrom £482Free CancellationRating
7.4
9,209 reviews
Search United Airlines flights

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

    Virgin Atlantic operates around 5 flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport every week. The average price of these flights found in the last 72 hours has been £578, but momondo users have found Virgin Atlantic deals from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from as low as £373 round-trip. Virgin Atlantic has been scored 7.5/10 in 678 reviews.

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

    £388 is the best Air France flight deal from Washington, D.C. Dulles Intl Airport to London Heathrow Airport found on momondo over the last 72 hours. The average Air France ticket price found was closer to £538, however, with flight time and availability significantly affecting the price. Air France (7.4/10 from 1,528 user reviews) flies into London Heathrow Airport from Washington, D.C. Dulles Intl Airport 5 times in an average week so prices can vary.

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
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Milton Keynes
Luton
Gatwick
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Swindon
Southend-on-Sea
Canterbury
Ipswich
Ilford
Poole
Guildford
Chelmsford
Hayes
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Dover
Folkestone

Why use momondo?

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

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 Washington, D.C. to London for you.

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

Flights from Washington, D.C. to London 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 Washington, D.C. to London?

Once you have performed a search for Washington, D.C. to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

If you are not ready to book a flight from Washington, D.C. to London now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to London and let you know when they change.

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