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Cheap flights from Washington, D.C. 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. to London departing on 13/10. 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

SWISS Logo
20:45 - 13:00IAD-LHR
11h 15m1 stop
SWISS Logo
18:40 - 16:15LHR-IAD
26h 35m1 stop
£226SWISS
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Wed, 10 Sep - Sun, 14 Sep
TAP AIR PORTUGAL Logo
17:30 - 21:35IAD-LHR
23h 05m1 stop
TAP AIR PORTUGAL Logo
18:30 - 15:15LHR-IAD
25h 45m1 stop
£315TAP AIR PORTUGAL
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Thu, 27 Nov - Wed, 3 Dec
Virgin Atlantic Logo
16:39 - 06:45BWI-LHR
33h 06m1 stop
Virgin Atlantic Logo
06:15 - 23:37LHR-BWI
22h 22m2 stops
£356Virgin Atlantic
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Sun, 21 Sep - Tue, 30 Sep
Virgin Atlantic Logo
18:19 - 13:30BWI-LHR
14h 11m1 stop
Virgin Atlantic Logo
09:20 - 18:17LHR-BWI
13h 57m1 stop
£362Virgin Atlantic
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Sun, 21 Sep - Tue, 30 Sep
British Airways Logo
22:40 - 11:05IAD-LHR
7h 25mdirect
British Airways Logo
06:10 - 15:00LHR-IAD
13h 50m1 stop
£369British Airways
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Tue, 26 Aug - Tue, 9 Sep
Icelandair Logo
19:30 - 19:30BWI-LHR
19h 00m1 stop
Icelandair Logo
20:35 - 18:30LHR-BWI
26h 55m1 stop
£370Icelandair
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Wed, 5 Nov - Tue, 11 Nov
Icelandair Logo
19:30 - 10:50BWI-LHR
10h 20m1 stop
Icelandair Logo
20:35 - 18:30LHR-BWI
26h 55m1 stop
£371Icelandair
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Thu, 6 Nov - Tue, 11 Nov
British Airways Logo
22:45 - 11:05IAD-LHR
7h 20mdirect
British Airways Logo
14:25 - 17:30LHR-IAD
8h 05mdirect
£374British Airways
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Wed, 8 Oct - Wed, 22 Oct
Iberia Logo
15:35 - 06:20DCA-LHR
9h 45m1 stop
Iberia Logo
11:30 - 23:07LHR-DCA
16h 37m2 stops
£384Iberia
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Wed, 3 Sep - Wed, 17 Sep
Iberia Logo
17:30 - 07:50DCA-LHR
9h 20m1 stop
Iberia Logo
09:15 - 23:07LHR-DCA
18h 52m2 stops
£385Iberia
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Sun, 17 Aug - Thu, 11 Sep

Iberia flights from Washington, D.C. to London Heathrow Airport

Our best Iberia deals on Washington, D.C. to London Heathrow Airport flight tickets
Iberia
3 Sept
DCA15:35Washington, D.C. Reagan-National
9h 45m
1 stop
LHR06:20London Heathrow
17 Sept
LHR11:30London Heathrow
16h 37m
2 stops
DCA23:07Washington, D.C. Reagan-National
£384
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Iberia
17 Aug
DCA17:30Washington, D.C. Reagan-National
9h 20m
1 stop
LHR07:50London Heathrow
11 Sept
LHR09:15London Heathrow
18h 52m
2 stops
DCA23:07Washington, D.C. Reagan-National
£385
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Iberia
16 Sept
DCA13:39Washington, D.C. Reagan-National
11h 41m
1 stop
LHR06:20London Heathrow
23 Sept
LHR10:50London Heathrow
17h 17m
2 stops
DCA23:07Washington, D.C. Reagan-National
£410
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British Airways flights from Washington, D.C. to London Heathrow Airport

Our best British Airways deals on Washington, D.C. to London Heathrow Airport flight tickets
British Airways
26 Aug
IAD22:40Washington, D.C. Dulles Intl
7h 25m
LHR11:05London Heathrow
9 Sept
LHR06:10London Heathrow
13h 50m
1 stop
IAD15:00Washington, D.C. Dulles Intl
£369
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British Airways
8 Oct
IAD22:45Washington, D.C. Dulles Intl
7h 20m
LHR11:05London Heathrow
22 Oct
LHR14:25London Heathrow
8h 05m
IAD17:30Washington, D.C. Dulles Intl
£374
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British Airways
24 Sept
IAD17:50Washington, D.C. Dulles Intl
7h 25m
LHR06:15London Heathrow
30 Sept
LHR17:00London Heathrow
8h 10m
IAD20:10Washington, D.C. Dulles Intl
£374
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momondo Fare Finder

 
Customise your flight search to find flights from Washington, D.C. 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 2 August 2025.
Use the filters below to find and compare flights from Washington, D.C. 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

Wed 10/9

20:45-13:00

1 stop11h 15m

London Heathrow

Sun 14/9

18:40-16:15

1 stop26h 35m

£226

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Thu 27/11

17:30-21:35

1 stop23h 05m

London Heathrow

Wed 3/12

18:30-15:15

1 stop25h 45m

£315

BaltimoreLondon

BWI - LHR

BWILHR

Baltimore/Washington

Sun 21/9

16:39-06:45

1 stop33h 06m

London Heathrow

Tue 30/9

06:15-23:37

2 stops22h 22m

£356

BaltimoreLondon

BWI - LHR

BWILHR

Baltimore/Washington

Sun 21/9

18:19-13:30

1 stop14h 11m

London Heathrow

Tue 30/9

09:20-18:17

1 stop13h 57m

£362

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 26/8

22:40-11:05

Nonstop7h 25m

London Heathrow

Tue 9/9

06:10-15:00

1 stop13h 50m

£369

BaltimoreLondon

BWI - LHR

BWILHR

Baltimore/Washington

Wed 5/11

19:30-19:30

1 stop19h 00m

London Heathrow

Tue 11/11

20:35-18:30

1 stop26h 55m

£370

BaltimoreLondon

BWI - LHR

BWILHR

Baltimore/Washington

Thu 6/11

19:30-10:50

1 stop10h 20m

London Heathrow

Tue 11/11

20:35-18:30

1 stop26h 55m

£371

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 8/10

22:45-11:05

Nonstop7h 20m

London Heathrow

Wed 22/10

14:25-17:30

Nonstop8h 05m

£374

Washington, D.C.London

DCA - LHR

DCALHR

Washington, D.C. Reagan-National

Wed 3/9

15:35-06:20

1 stop9h 45m

London Heathrow

Wed 17/9

11:30-23:07

2 stops16h 37m

£384

Washington, D.C.London

DCA - LHR

DCALHR

Washington, D.C. Reagan-National

Sun 17/8

17:30-07:50

1 stop9h 20m

London Heathrow

Thu 11/9

09:15-23:07

2 stops18h 52m

£385

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 London from

How to get the cheapest flight ticket from Washington, D.C. 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 typical price of a round-trip flight between Washington, D.C. and London Heathrow Airport?

What is the cheapest month to fly to London Heathrow Airport?

In general, October is the cheapest month to fly from Washington, D.C. to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £513. The month of February is another great option to travel to London Heathrow Airport, with average flight prices from Washington, D.C. averaging around £515.

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. is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as £547. 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 £635.

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. to London Heathrow Airport in the evening for as low as £573. 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 £601 on average. Flights to London Heathrow Airport from Washington, D.C. 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. to London Heathrow flight route?

Fly from Washington, D.C. Dulles Intl to London Heathrow for the best Washington, D.C. - 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. when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £582 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. for as low as £533 on momondo.

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

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

You could potentially save up to 49% on your flight if you consider stops on a Washington, D.C. to London Heathrow Airport flight.

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

As of August 2025, prices for Washington, D.C. to London Heathrow Airport flights are approximately 15% more expensive when compared to flights at the same time last year.

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

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. 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. to London Heathrow Airport (WAS to LHR) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. 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. in the past 72 hours is £161. The best return flight deal from Washington, D.C. to London Heathrow Airport found on momondo in the last 72 hours is £226.
The fastest flight from Washington, D.C. to London Heathrow Airport takes 7h 15m
Direct flights go from Washington, D.C. to London Heathrow Airport every day.
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  • How far is Washington, D.C. to London Heathrow by plane?

    There are 3649.4 mi between Washington, D.C. and London Heathrow. By plane, this route typically takes 7h 15m.

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

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

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

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

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

    The travel and health documents you'll need for your trip to London Heathrow 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 London Heathrow 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 Washington, D.C. to London Heathrow Airport?

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

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

Compare and see reviews for airlines that fly from Washington, D.C. to London Heathrow Airport with momondo
Airline
Rating
Free Cancellation
Price
LufthansaPriceFrom £313Free CancellationRating
6.8
7,276 reviews
Search Lufthansa flights
IcelandairPriceFrom £347Free CancellationRating
7.0
520 reviews
Search Icelandair flights
Virgin AtlanticPriceFrom £384Free CancellationRating
7.4
655 reviews
Search Virgin Atlantic flights
Air FrancePriceFrom £403Free CancellationRating
7.5
1,465 reviews
Search Air France flights
IberiaPriceFrom £421Free CancellationRating
7.0
2,862 reviews
Search Iberia flights
British AirwaysPriceFrom £439Free CancellationRating
6.6
7,224 reviews
Search British Airways flights
United AirlinesPriceFrom £462Free CancellationRating
7.4
8,904 reviews
Search United Airlines flights
KLMPriceFrom £466Free CancellationRating
7.8
1,384 reviews
Search KLM flights
American AirlinesPriceFrom £501Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights

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

    The lowest priced KLM flight from Washington, D.C. to London Heathrow Airport from the last 72 hours was £616. Generally, KLM has 6 flights on this route every week with an average price of £739. KLM is rated 7.8/10 by our users.

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

    Across 1,465 Air France reviews on momondo, the average score is 7.5/10. Air France flies from Washington, D.C. to London Heathrow Airport about 6 times each week, with ticket deals ranging from £533 to £720. Price data is based on momondo searches in the last 72 hours.

Travelling to a place near London?

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Hounslow
Swanage
Salisbury

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?

momondo does allow users to show only those flights to London from Washington, D.C. which offer a flexible booking policy as well as other useful filters and features.

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?

Yes momondo offers price alerts on flights to London from Washington, D.C.. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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