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Cheap flights from Washington, D.C. Dulles Intl Airport to London from £161

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 12/8. 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

TAP AIR PORTUGAL Logo
17:30 - 18:55IAD-LHR
20h 25m1 stop
TAP AIR PORTUGAL Logo
18:30 - 15:15LHR-IAD
25h 45m1 stop
£316TAP AIR PORTUGAL
Find Deal
Do, 27 Nov - Mi, 3 Dez
TAP AIR PORTUGAL Logo
17:00 - 10:20IAD-LHR
12h 20m1 stop
TAP AIR PORTUGAL Logo
08:00 - 20:50LHR-IAD
17h 50m1 stop
£318TAP AIR PORTUGAL
Find Deal
Di, 23 Sep - Do, 9 Okt
Virgin Atlantic Logo
17:50 - 06:20IAD-LHR
7h 30mdirect
Virgin Atlantic Logo
09:00 - 16:20LHR-IAD
12h 20m1 stop
£363Virgin Atlantic
Find Deal
So, 21 Sep - Di, 30 Sep
British Airways Logo
22:40 - 11:05IAD-LHR
7h 25mdirect
British Airways Logo
06:10 - 15:00LHR-IAD
13h 50m1 stop
£366British Airways
Find Deal
Di, 26 Aug - Di, 9 Sep
Virgin Atlantic Logo
17:50 - 06:20IAD-LHR
7h 30mdirect
Virgin Atlantic Logo
06:30 - 15:35LHR-IAD
14h 05m1 stop
£367Virgin Atlantic
Find Deal
Mo, 11 Aug - Mi, 20 Aug
British Airways Logo
22:40 - 11:05IAD-LHR
7h 25mdirect
British Airways Logo
14:30 - 17:35LHR-IAD
8h 05mdirect
£372British Airways
Find Deal
Mi, 24 Sep - Di, 30 Sep
Icelandair Logo
19:40 - 10:50IAD-LHR
10h 10m1 stop
Icelandair Logo
12:15 - 18:20LHR-IAD
11h 05m1 stop
£372Icelandair
Find Deal
Mo, 10 Nov - So, 16 Nov
United Airlines Logo
18:35 - 06:55IAD-LHR
7h 20mdirect
United Airlines Logo
13:45 - 16:15LHR-IAD
31h 30m1 stop
£373United Airlines
Find Deal
Di, 26 Aug - Mo, 1 Sep
Icelandair Logo
20:30 - 11:55IAD-LHR
10h 25m1 stop
Icelandair Logo
21:25 - 19:20LHR-IAD
26h 55m1 stop
£374Icelandair
Find Deal
Mi, 1 Okt - So, 5 Okt
United Airlines Logo
18:40 - 06:55IAD-LHR
7h 15mdirect
United Airlines Logo
08:45 - 16:15LHR-IAD
12h 30m1 stop
£375United Airlines
Find Deal
Mi, 24 Sep - Di, 30 Sep

TAP AIR PORTUGAL flights from Washington, D.C. Dulles Intl Airport to London Heathrow Airport

Our best TAP AIR PORTUGAL deals on Washington, D.C. Dulles Intl Airport to London Heathrow Airport flight tickets
TAP AIR PORTUGAL
27 Nov
IAD17:30Washington, D.C. Dulles Intl
20h 25m
1 stop
LHR18:55London Heathrow
3 Dec
LHR18:30London Heathrow
25h 45m
1 stop
IAD15:15Washington, D.C. Dulles Intl
£316
Find similar
TAP AIR PORTUGAL
23 Sept
IAD17:00Washington, D.C. Dulles Intl
12h 20m
1 stop
LHR10:20London Heathrow
9 Oct
LHR08:00London Heathrow
17h 50m
1 stop
IAD20:50Washington, D.C. Dulles Intl
£318
Find similar
TAP AIR PORTUGAL
6 Oct
IAD17:45Washington, D.C. Dulles Intl
14h 00m
1 stop
LHR12:45London Heathrow
14 Oct
LHR19:50London Heathrow
24h 30m
1 stop
IAD15:20Washington, D.C. Dulles Intl
£319
Find similar

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
10 Aug
IAD10:14Washington, D.C. Dulles Intl
15h 31m
1 stop
LHR06:45London Heathrow
19 Aug
LHR06:30London Heathrow
14h 05m
1 stop
IAD15:35Washington, D.C. Dulles Intl
£380
Find similar
Delta
6 Aug
IAD17:50Washington, D.C. Dulles Intl
7h 30m
LHR06:20London Heathrow
21 Aug
LHR09:00London Heathrow
15h 15m
1 stop
IAD19:15Washington, D.C. Dulles Intl
£381
Find similar
Delta
12 Aug
IAD17:50Washington, D.C. Dulles Intl
7h 30m
LHR06:20London Heathrow
20 Aug
LHR08:40London Heathrow
11h 55m
1 stop
IAD15:35Washington, D.C. Dulles Intl
£382
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 31 Juli 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

Do 27/11

17:30-18:55

1 stop20h 25m

London Heathrow

Mi 3/12

18:30-15:15

1 stop25h 45m

£316

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Di 23/9

17:00-10:20

1 stop12h 20m

London Heathrow

Do 9/10

08:00-20:50

1 stop17h 50m

£318

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

So 21/9

17:50-06:20

Nonstop7h 30m

London Heathrow

Di 30/9

09:00-16:20

1 stop12h 20m

£363

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Di 26/8

22:40-11:05

Nonstop7h 25m

London Heathrow

Di 9/9

06:10-15:00

1 stop13h 50m

£366

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mo 11/8

17:50-06:20

Nonstop7h 30m

London Heathrow

Mi 20/8

06:30-15:35

1 stop14h 05m

£367

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mi 24/9

22:40-11:05

Nonstop7h 25m

London Heathrow

Di 30/9

14:30-17:35

Nonstop8h 05m

£372

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mo 10/11

19:40-10:50

1 stop10h 10m

London Heathrow

So 16/11

12:15-18:20

1 stop11h 05m

£372

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Di 26/8

18:35-06:55

Nonstop7h 20m

London Heathrow

Mo 1/9

13:45-16:15

1 stop31h 30m

£373

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mi 1/10

20:30-11:55

1 stop10h 25m

London Heathrow

So 5/10

21:25-19:20

1 stop26h 55m

£374

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Mi 24/9

18:40-06:55

Nonstop7h 15m

London Heathrow

Di 30/9

08:45-16:15

1 stop12h 30m

£375

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 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, September 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 £496. The month of October is another great option to travel to London Heathrow Airport, with average flight prices from Washington, D.C. Dulles Intl Airport averaging around £513.

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 £543. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Sunday is £631.

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 evening. momondo users have found flights departing from Washington, D.C. Dulles Intl Airport to London Heathrow Airport in the evening for as low as £569. 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 afternoon when prices are £597 on average. Flights to London Heathrow Airport from Washington, D.C. Dulles Intl Airport in the afternoon 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 £570 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 £515 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.

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

As of July 2025, prices for Washington, D.C. Dulles Intl Airport to London Heathrow Airport flights are approximately 13% 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

£161

Fastest flight time

7h 15m

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 £161. 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 £316.
The fastest flight from Washington, D.C. Dulles Intl Airport to London Heathrow Airport takes 7h 15m
Direct flights go from Washington, D.C. Dulles Intl Airport to London Heathrow Airport every day.
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  • 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 15m.

  • 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 £311Free CancellationRating
6.8
7,269 reviews
Search Lufthansa flights
IcelandairPriceFrom £372Free CancellationRating
7.0
519 reviews
Search Icelandair flights
Virgin AtlanticPriceFrom £381Free CancellationRating
7.4
655 reviews
Search Virgin Atlantic flights
Air FrancePriceFrom £400Free CancellationRating
7.5
1,465 reviews
Search Air France flights
British AirwaysPriceFrom £436Free CancellationRating
6.6
7,217 reviews
Search British Airways flights
United AirlinesPriceFrom £459Free CancellationRating
7.4
8,896 reviews
Search United Airlines flights
IberiaPriceFrom £461Free CancellationRating
7.0
2,859 reviews
Search Iberia flights
KLMPriceFrom £463Free CancellationRating
7.8
1,383 reviews
Search KLM flights

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

    KLM 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 £739, but momondo users have found KLM deals from Washington, D.C. Dulles Intl Airport to London Heathrow Airport from as low as £616 round-trip. KLM has been scored 7.8/10 in 1,383 reviews.

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

    £533 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 £720, however, with flight time and availability significantly affecting the price. Air France (7.5/10 from 1,465 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?

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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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