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Cheap flights from Washington, D.C. Dulles Intl Airport to London from £276

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 16/1. 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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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.
Scandinavian Airlines Logo
20:20 - 16:25
IAD
-
LHR
15h 05m2 stops
Scandinavian Airlines Logo
10:20 - 16:50
LHR
-
IAD
11h 30m1 stop
£426Scandinavian Airlines
Sun, 19 Apr - Sun, 26 Apr
Icelandair Logo
20:30 - 20:20
IAD
-
LHR
18h 50m1 stop
Icelandair Logo
13:05 - 19:20
LHR
-
IAD
11h 15m1 stop
£427Icelandair
Thu, 30 Apr - Tue, 5 May
Icelandair Logo
20:30 - 20:20
IAD
-
LHR
18h 50m1 stop
Icelandair Logo
21:25 - 19:20
LHR
-
IAD
26h 55m1 stop
£428Icelandair
Thu, 30 Apr - Thu, 14 May
Scandinavian Airlines Logo
12:23 - 09:20
IAD
-
LHR
15h 57m2 stops
Scandinavian Airlines Logo
06:40 - 18:50
LHR
-
IAD
17h 10m2 stops
£429Scandinavian Airlines
Sat, 24 Jan - Sat, 31 Jan
Scandinavian Airlines Logo
20:30 - 17:40
IAD
-
LHR
16h 10m1 stop
Scandinavian Airlines Logo
19:30 - 17:15
LHR
-
IAD
26h 45m1 stop
£429Scandinavian Airlines
Sat, 17 Jan - Tue, 20 Jan
Scandinavian Airlines Logo
12:23 - 09:20
IAD
-
LHR
15h 57m2 stops
Scandinavian Airlines Logo
19:50 - 15:20
LHR
-
IAD
24h 30m2 stops
£430Scandinavian Airlines
Mon, 12 Jan - Sun, 25 Jan
Scandinavian Airlines Logo
20:20 - 16:25
IAD
-
LHR
15h 05m2 stops
Scandinavian Airlines Logo
15:35 - 16:50
LHR
-
IAD
30h 15m2 stops
£431Scandinavian Airlines
Fri, 17 Apr - Sat, 25 Apr
Icelandair Logo
19:40 - 10:50
IAD
-
LHR
10h 10m1 stop
Icelandair Logo
12:15 - 18:30
LHR
-
IAD
11h 15m1 stop
£432Icelandair
Fri, 9 Jan - Sun, 18 Jan
Scandinavian Airlines Logo
20:20 - 16:00
IAD
-
LHR
14h 40m1 stop
Scandinavian Airlines Logo
06:40 - 16:50
LHR
-
IAD
15h 10m1 stop
£432Scandinavian Airlines
Fri, 3 Apr - Thu, 9 Apr
Scandinavian Airlines Logo
20:30 - 17:00
IAD
-
LHR
15h 30m2 stops
Scandinavian Airlines Logo
19:50 - 18:15
LHR
-
IAD
26h 25m2 stops
£433Scandinavian Airlines
Thu, 5 Mar - Sun, 8 Mar

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

Our best Delta deals on Washington, D.C. Dulles Intl Airport to London Heathrow Airport flight tickets
Delta
12 Mar
IAD23:20Washington, D.C. Dulles Intl
7h 30m
LHR10:50London Heathrow
19 Mar
LHR08:40London Heathrow
12h 25m
1 stop
IAD17:05Washington, D.C. Dulles Intl
£459
Find similar
Delta
7 Jan
IAD22:20Washington, D.C. Dulles Intl
7h 30m
LHR10:50London Heathrow
15 Jan
LHR08:40London Heathrow
12h 25m
1 stop
IAD16:05Washington, D.C. Dulles Intl
£459
Find similar
Delta
6 Mar
IAD17:11Washington, D.C. Dulles Intl
10h 34m
1 stop
LHR08:45London Heathrow
19 Mar
LHR10:00London Heathrow
11h 05m
1 stop
IAD17:05Washington, D.C. Dulles Intl
£462
Find similar

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

Our best United Airlines deals on Washington, D.C. Dulles Intl Airport to London Heathrow Airport flight tickets
United Airlines
30 Dec
IAD22:08Washington, D.C. Dulles Intl
30h 12m
1 stop
LHR09:20London Heathrow
13 Jan
LHR09:00London Heathrow
12h 40m
1 stop
IAD16:40Washington, D.C. Dulles Intl
£452
Find similar
United Airlines
10 Mar
IAD19:20Washington, D.C. Dulles Intl
7h 20m
LHR06:40London Heathrow
19 Mar
LHR06:35London Heathrow
14h 00m
1 stop
IAD16:35Washington, D.C. Dulles Intl
£458
Find similar
United Airlines
12 Mar
IAD09:55Washington, D.C. Dulles Intl
17h 15m
1 stop
LHR07:10London Heathrow
19 Mar
LHR11:10London Heathrow
13h 55m
1 stop
IAD21:05Washington, D.C. Dulles Intl
£460
Find similar

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 12 December 2025.
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

Sun 19/4

20:20-16:25

2 stops15h 05m

London Heathrow

Sun 26/4

10:20-16:50

1 stop11h 30m

£426

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Thu 30/4

20:30-20:20

1 stop18h 50m

London Heathrow

Tue 5/5

13:05-19:20

1 stop11h 15m

£427

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Thu 30/4

20:30-20:20

1 stop18h 50m

London Heathrow

Thu 14/5

21:25-19:20

1 stop26h 55m

£428

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 24/1

12:23-09:20

2 stops15h 57m

London Heathrow

Sat 31/1

06:40-18:50

2 stops17h 10m

£429

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sat 17/1

20:30-17:40

1 stop16h 10m

London Heathrow

Tue 20/1

19:30-17:15

1 stop26h 45m

£429

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mon 12/1

12:23-09:20

2 stops15h 57m

London Heathrow

Sun 25/1

19:50-15:20

2 stops24h 30m

£430

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 17/4

20:20-16:25

2 stops15h 05m

London Heathrow

Sat 25/4

15:35-16:50

2 stops30h 15m

£431

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 9/1

19:40-10:50

1 stop10h 10m

London Heathrow

Sun 18/1

12:15-18:30

1 stop11h 15m

£432

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Fri 3/4

20:20-16:00

1 stop14h 40m

London Heathrow

Thu 9/4

06:40-16:50

1 stop15h 10m

£432

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Thu 5/3

20:30-17:00

2 stops15h 30m

London Heathrow

Sun 8/3

19:50-18:15

2 stops26h 25m

£433

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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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 £501. 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 £504.

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 £531. 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 £611.

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 £571. 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 £575 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 £563 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 £527 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 40% 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 December 2025, prices for Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights are approximately 24% 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

£335

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 £335. 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 £503.
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 £310Free CancellationRating
6.8
7,626 reviews
Search Lufthansa flights
IcelandairPriceFrom £369Free CancellationRating
7.0
589 reviews
Search Icelandair flights
Virgin AtlanticPriceFrom £383Free CancellationRating
7.5
675 reviews
Search Virgin Atlantic flights
British AirwaysPriceFrom £386Free CancellationRating
6.7
7,571 reviews
Search British Airways flights
Air FrancePriceFrom £398Free CancellationRating
7.4
1,504 reviews
Search Air France flights
IberiaPriceFrom £459Free CancellationRating
7.0
3,046 reviews
Search Iberia flights
United AirlinesPriceFrom £503Free CancellationRating
7.4
9,096 reviews
Search United Airlines flights

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

    Virgin Atlantic operates around 6 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 £611, but momondo users have found Virgin Atlantic deals from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from as low as £383 round-trip. Virgin Atlantic has been scored 7.5/10 in 675 reviews.

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

    £398 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 £507, however, with flight time and availability significantly affecting the price. Air France (7.4/10 from 1,504 user reviews) flies into London Heathrow Airport from Washington, D.C. Dulles Intl Airport 6 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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Worthing

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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