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Cheap flights from Washington, D.C. to London from $248

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 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. to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
Scandinavian Airlines Logo
12:30 pm - 9:35 amIAD-LHR
16h 05m2 stops
Scandinavian Airlines Logo
7:05 am - 4:50 pmLHR-IAD
14h 45m2 stops
$563Scandinavian Airlines
Find Deal
Wed, Apr 1 - Wed, Apr 29
Virgin Atlantic Logo
10:20 pm - 10:50 amIAD-LHR
7h 30mnonstop
Virgin Atlantic Logo
8:40 am - 4:05 pmLHR-IAD
12h 25m1 stop
$564Virgin Atlantic
Find Deal
Sun, Nov 30 - Sun, Dec 7
TAP AIR PORTUGAL Logo
5:30 pm - 5:30 pmIAD-LHR
19h 00m1 stop
TAP AIR PORTUGAL Logo
6:00 am - 2:35 pmLHR-IAD
13h 35m1 stop
$565TAP AIR PORTUGAL
Find Deal
Thu, Dec 11 - Tue, Dec 16
British Airways Logo
6:20 pm - 6:30 amIAD-LHR
7h 10mnonstop
British Airways Logo
12:10 pm - 3:35 pmLHR-IAD
8h 25mnonstop
$576British Airways
Find Deal
Tue, Dec 2 - Tue, Dec 9
British Airways Logo
6:20 pm - 6:30 amIAD-LHR
7h 10mnonstop
British Airways Logo
4:25 pm - 7:55 pmLHR-IAD
8h 30mnonstop
$577British Airways
Find Deal
Tue, Dec 2 - Tue, Dec 9
Iberia Logo
5:45 pm - 9:40 amDCA-LHR
10h 55m1 stop
Iberia Logo
11:25 am - 6:57 pmLHR-DCA
36h 32m2 stops
$577Iberia
Find Deal
Tue, Dec 2 - Tue, Dec 9
Iberia Logo
1:44 pm - 6:20 amDCA-LHR
11h 36m1 stop
Iberia Logo
10:35 am - 4:54 pmLHR-DCA
11h 19m1 stop
$595Iberia
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Sun, Nov 9 - Tue, Nov 18
United Airlines Logo
6:20 pm - 6:40 amIAD-LHR
7h 20mnonstop
United Airlines Logo
6:50 am - 2:35 pmLHR-IAD
12h 45m1 stop
$603United Airlines
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Tue, Dec 2 - Tue, Dec 9
United Airlines Logo
12:42 pm - 8:30 amIAD-LHR
14h 48m2 stops
United Airlines Logo
9:00 am - 4:40 pmLHR-IAD
12h 40m1 stop
$610United Airlines
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Tue, Dec 2 - Thu, Dec 11
American Airlines Logo
8:35 pm - 8:40 amBWI-LHR
7h 05mnonstop
American Airlines Logo
3:25 pm - 6:45 pmLHR-BWI
8h 20mnonstop
$632American Airlines
Find Deal
Thu, Dec 4 - Thu, Dec 18

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

Our best Delta deals on Washington, D.C. to London Heathrow Airport flight tickets
Delta
Dec 2
IAD10:20 pmWashington, D.C. Dulles Intl
7h 30m
LHR10:50 amLondon Heathrow
Dec 9
LHR9:00 amLondon Heathrow
12h 35m
1 stop
IAD4:35 pmWashington, D.C. Dulles Intl
$575
Find similar
Delta
Nov 16
IAD10:20 pmWashington, D.C. Dulles Intl
7h 30m
LHR10:50 amLondon Heathrow
Nov 25
LHR10:00 amLondon Heathrow
11h 05m
1 stop
IAD4:05 pmWashington, D.C. Dulles Intl
$576
Find similar
Delta
Dec 7
IAD10:20 pmWashington, D.C. Dulles Intl
7h 30m
LHR10:50 amLondon Heathrow
Dec 14
LHR6:30 amLondon Heathrow
14h 35m
1 stop
IAD4:05 pmWashington, D.C. Dulles Intl
$579
Find similar

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
Dec 2
IAD6:20 pmWashington, D.C. Dulles Intl
7h 10m
LHR6:30 amLondon Heathrow
Dec 9
LHR12:10 pmLondon Heathrow
8h 25m
IAD3:35 pmWashington, D.C. Dulles Intl
$576
Find similar
British Airways
Dec 2
IAD6:20 pmWashington, D.C. Dulles Intl
7h 10m
LHR6:30 amLondon Heathrow
Dec 9
LHR4:25 pmLondon Heathrow
8h 30m
IAD7:55 pmWashington, D.C. Dulles Intl
$577
Find similar
British Airways
Feb 4
IAD6:20 pmWashington, D.C. Dulles Intl
7h 10m
LHR6:30 amLondon Heathrow
Feb 11
LHR12:10 pmLondon Heathrow
8h 25m
IAD3:35 pmWashington, D.C. Dulles Intl
$584
Find similar

momondo Fare Finder

 
Customize 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 832,500 searches. Data last updated November 4, 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 4/1

12:30 pm-9:35 am

2 stops16h 05m

London Heathrow

Wed 4/29

7:05 am-4:50 pm

2 stops14h 45m

$563

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 11/30

10:20 pm-10:50 am

Nonstop7h 30m

London Heathrow

Sun 12/7

8:40 am-4:05 pm

1 stop12h 25m

$564

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Thu 12/11

5:30 pm-5:30 pm

1 stop19h 00m

London Heathrow

Tue 12/16

6:00 am-2:35 pm

1 stop13h 35m

$565

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 12/2

6:20 pm-6:30 am

Nonstop7h 10m

London Heathrow

Tue 12/9

12:10 pm-3:35 pm

Nonstop8h 25m

$576

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 12/2

6:20 pm-6:30 am

Nonstop7h 10m

London Heathrow

Tue 12/9

4:25 pm-7:55 pm

Nonstop8h 30m

$577

Washington, D.C.London

DCA - LHR

DCALHR

Washington, D.C. Reagan-National

Tue 12/2

5:45 pm-9:40 am

1 stop10h 55m

London Heathrow

Tue 12/9

11:25 am-6:57 pm

2 stops36h 32m

$577

Washington, D.C.London

DCA - LHR

DCALHR

Washington, D.C. Reagan-National

Sun 11/9

1:44 pm-6:20 am

1 stop11h 36m

London Heathrow

Tue 11/18

10:35 am-4:54 pm

1 stop11h 19m

$595

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 12/2

6:20 pm-6:40 am

Nonstop7h 20m

London Heathrow

Tue 12/9

6:50 am-2:35 pm

1 stop12h 45m

$603

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Tue 12/2

12:42 pm-8:30 am

2 stops14h 48m

London Heathrow

Thu 12/11

9:00 am-4:40 pm

1 stop12h 40m

$610

BaltimoreLondon

BWI - LHR

BWILHR

Baltimore/Washington

Thu 12/4

8:35 pm-8:40 am

Nonstop7h 05m

London Heathrow

Thu 12/18

3:25 pm-6:45 pm

Nonstop8h 20m

$632

Flights are sorted by cheapest round-trip flights 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?

The month of September is, on average, the cheapest month to fly to London Heathrow Airport from Washington, D.C., with most prices found around $658. If you’re not able to fly to London Heathrow Airport in September, then August is your next best option. Flight prices from Washington, D.C. to London Heathrow Airport during August average around $659.

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

Our data shows that Wednesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $766. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $905.

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 $817. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the afternoon are often more expensive with an average ticket price of $823.

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 $759 when searching weeks out. 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 $705 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 26% 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 November 2025, prices for Washington, D.C. to London Heathrow Airport flights are approximately 2% cheaper 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 round-trip 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

$442

Fastest flight time

7h 05m

Direct flights

Mon, Wed, Thu, Fri, Sat and Sun
The best one-way flight to London Heathrow Airport from Washington, D.C. in the past 72 hours is $442. The best round-trip flight deal from Washington, D.C. to London Heathrow Airport found on momondo in the last 72 hours is $671.
The fastest flight from Washington, D.C. to London Heathrow Airport takes 7h 05m
Direct flights go from Washington, D.C. to London Heathrow Airport on Monday, Wednesday, Thursday, Friday, Saturday and Sunday. There are no airlines offering direct flights.
Search flight deals

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

    Washington, D.C. and London Heathrow are 3649.4 mi apart from one another. 7h 05m is a normal flight duration for this route.

  • 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 were last updated today.

  • 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?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check 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 required travel and health documents for your London Heathrow Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at London Heathrow Airport. We recommend that you seek guidance from your airline or a reliable 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
JetBluePriceFrom $31Free CancellationRating
7.2
2,908 reviews
Search JetBlue flights
TAP AIR PORTUGALPriceFrom $395Free CancellationRating
7.1
2,046 reviews
Search TAP AIR PORTUGAL flights
LufthansaPriceFrom $397Free CancellationRating
6.8
7,553 reviews
Search Lufthansa flights
Scandinavian AirlinesPriceFrom $424Free CancellationRating
7.4
1,560 reviews
Search Scandinavian Airlines flights
PLAYPriceFrom $429Free CancellationRating
7.0
103 reviews
Search PLAY flights
IcelandairPriceFrom $432Free CancellationRating
7.1
571 reviews
Search Icelandair flights
Virgin AtlanticPriceFrom $497Free CancellationRating
7.5
671 reviews
Search Virgin Atlantic flights
American AirlinesPriceFrom $497Free CancellationRating
7.2
11,040 reviews
Search American Airlines flights
United AirlinesPriceFrom $506Free CancellationRating
7.4
9,001 reviews
Search United Airlines flights
KLMPriceFrom $520Free CancellationRating
7.7
1,405 reviews
Search KLM flights

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

    Delta flight deals from Washington, D.C. to London Heathrow Airport start from $558 round-trip. Over the 7 Delta flights for this route in a normal week, average airfare is usually $819 round-trip - but some users have found much cheaper deals with momondo.

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

    Across 1,405 KLM reviews on momondo, the average score is 7.7/10. KLM flies from Washington, D.C. to London Heathrow Airport about 7 times each week, with ticket deals ranging from $520 to $654. Price data is based on momondo searches in the last 72 hours.

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Gatwick
Hounslow
Milton Keynes
Dover
Luton
Slough
Guildford
Hayes
Dartford
Crawley
Stratford-upon-Avon
Brentwood
Salisbury
Chelmsford
Folkestone
Romford
Ilford
Swindon
Cobham
Wembley

Why use momondo?

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

Finding the right flight to London from Washington, D.C. is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to London quick and easy, saving you time and money.

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

Yes. momondo allows you to filter the results for Washington, D.C. to London flights to just show those with flexible booking policies.

How can momondo help me find flights from Washington, D.C. to London?

momondo provides multiple filters to help you find the best flight to London from Washington, D.C.. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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.

An easier way to manage your London Heathrow Airport trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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