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Cheap flights from Washington, D.C. to London from $227

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 11/14. 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 (WAS-LHR)

Cheap round-trip flights

Icelandair Logo
8:30 pm - 8:20 pmIAD-LHR
18h 50m1 stop
Icelandair Logo
9:25 pm - 7:20 pmLHR-IAD
26h 55m1 stop
$491Icelandair
Find Deal
Wed, Oct 15 - Tue, Oct 21
Icelandair Logo
11:15 pm - 8:20 pmIAD-LHR
16h 05m1 stop
Icelandair Logo
9:25 pm - 7:20 pmLHR-IAD
26h 55m1 stop
$492Icelandair
Find Deal
Wed, Oct 1 - Wed, Oct 8
Icelandair Logo
11:15 pm - 8:20 pmIAD-LHR
16h 05m1 stop
Icelandair Logo
9:25 pm - 7:20 pmLHR-IAD
26h 55m1 stop
$493Icelandair
Find Deal
Wed, Oct 1 - Sun, Oct 5
British Airways Logo
9:35 pm - 9:50 amBWI-LHR
7h 15mnonstop
British Airways Logo
4:35 pm - 7:45 pmLHR-BWI
8h 10mnonstop
$576British Airways
Find Deal
Sun, Sep 21 - Tue, Sep 30
British Airways Logo
6:41 pm - 12:30 pmBWI-LHR
12h 49m1 stop
British Airways Logo
4:35 pm - 7:45 pmLHR-BWI
8h 10mnonstop
$579British Airways
Find Deal
Wed, Oct 1 - Wed, Oct 8
American Airlines Logo
5:24 pm - 12:30 pmBWI-LHR
14h 06m1 stop
American Airlines Logo
4:35 pm - 7:45 pmLHR-BWI
8h 10mnonstop
$591American Airlines
Find Deal
Sun, Sep 21 - Tue, Sep 30
American Airlines Logo
5:24 pm - 9:05 amBWI-LHR
10h 41m1 stop
American Airlines Logo
4:35 pm - 7:45 pmLHR-BWI
8h 10mnonstop
$593American Airlines
Find Deal
Sun, Sep 21 - Tue, Sep 30
United Airlines Logo
6:00 am - 8:40 pmDCA-LHR
9h 40m1 stop
United Airlines Logo
3:20 pm - 9:37 pmLHR-DCA
11h 17m1 stop
$606United Airlines
Find Deal
Wed, Oct 15 - Wed, Oct 22
United Airlines Logo
3:30 pm - 7:55 amDCA-LHR
11h 25m1 stop
United Airlines Logo
12:50 pm - 9:55 pmLHR-DCA
14h 05m1 stop
$609United Airlines
Find Deal
Mon, Dec 1 - Tue, Dec 9
Iberia Logo
3:35 pm - 6:20 amDCA-LHR
9h 45m1 stop
Iberia Logo
5:00 pm - 11:07 pmLHR-DCA
11h 07m1 stop
$631Iberia
Find Deal
Tue, Sep 16 - Wed, Oct 1

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

Our best Icelandair deals on Washington, D.C. to London Heathrow Airport flight tickets
Icelandair
Oct 15
IAD8:30 pmWashington, D.C. Dulles Intl
18h 50m
1 stop
LHR8:20 pmLondon Heathrow
Oct 21
LHR9:25 pmLondon Heathrow
26h 55m
1 stop
IAD7:20 pmWashington, D.C. Dulles Intl
$491
Find similar
Icelandair
Oct 1
IAD11:15 pmWashington, D.C. Dulles Intl
16h 05m
1 stop
LHR8:20 pmLondon Heathrow
Oct 8
LHR9:25 pmLondon Heathrow
26h 55m
1 stop
IAD7:20 pmWashington, D.C. Dulles Intl
$492
Find similar
Icelandair
Oct 1
IAD11:15 pmWashington, D.C. Dulles Intl
16h 05m
1 stop
LHR8:20 pmLondon Heathrow
Oct 5
LHR9:25 pmLondon Heathrow
26h 55m
1 stop
IAD7:20 pmWashington, D.C. Dulles Intl
$493
Find similar

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

Our best Scandinavian Airlines deals on Washington, D.C. to London Heathrow Airport flight tickets
Scandinavian Airlines
Dec 3
IAD8:30 pmWashington, D.C. Dulles Intl
20h 10m
1 stop
LHR9:40 pmLondon Heathrow
Dec 10
LHR6:40 amLondon Heathrow
15h 35m
1 stop
IAD5:15 pmWashington, D.C. Dulles Intl
$494
Find similar
Scandinavian Airlines
Dec 10
IAD8:30 pmWashington, D.C. Dulles Intl
17h 00m
1 stop
LHR6:30 pmLondon Heathrow
Dec 14
LHR9:05 pmLondon Heathrow
25h 10m
2 stops
IAD5:15 pmWashington, D.C. Dulles Intl
$502
Find similar
Scandinavian Airlines
Dec 4
IAD8:30 pmWashington, D.C. Dulles Intl
14h 55m
2 stops
LHR4:25 pmLondon Heathrow
Dec 14
LHR9:05 pmLondon Heathrow
25h 10m
2 stops
IAD5:15 pmWashington, D.C. Dulles Intl
$504
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 September 2, 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 10/15

8:30 pm-8:20 pm

1 stop18h 50m

London Heathrow

Tue 10/21

9:25 pm-7:20 pm

1 stop26h 55m

$491

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 10/1

11:15 pm-8:20 pm

1 stop16h 05m

London Heathrow

Wed 10/8

9:25 pm-7:20 pm

1 stop26h 55m

$492

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Wed 10/1

11:15 pm-8:20 pm

1 stop16h 05m

London Heathrow

Sun 10/5

9:25 pm-7:20 pm

1 stop26h 55m

$493

BaltimoreLondon

BWI - LHR

BWILHR

Baltimore/Washington

Sun 9/21

9:35 pm-9:50 am

Nonstop7h 15m

London Heathrow

Tue 9/30

4:35 pm-7:45 pm

Nonstop8h 10m

$576

BaltimoreLondon

BWI - LHR

BWILHR

Baltimore/Washington

Wed 10/1

6:41 pm-12:30 pm

1 stop12h 49m

London Heathrow

Wed 10/8

4:35 pm-7:45 pm

Nonstop8h 10m

$579

BaltimoreLondon

BWI - LHR

BWILHR

Baltimore/Washington

Sun 9/21

5:24 pm-12:30 pm

1 stop14h 06m

London Heathrow

Tue 9/30

4:35 pm-7:45 pm

Nonstop8h 10m

$591

BaltimoreLondon

BWI - LHR

BWILHR

Baltimore/Washington

Sun 9/21

5:24 pm-9:05 am

1 stop10h 41m

London Heathrow

Tue 9/30

4:35 pm-7:45 pm

Nonstop8h 10m

$593

Washington, D.C.London

DCA - LHR

DCALHR

Washington, D.C. Reagan-National

Wed 10/15

6:00 am-8:40 pm

1 stop9h 40m

London Heathrow

Wed 10/22

3:20 pm-9:37 pm

1 stop11h 17m

$606

Washington, D.C.London

DCA - LHR

DCALHR

Washington, D.C. Reagan-National

Mon 12/1

3:30 pm-7:55 am

1 stop11h 25m

London Heathrow

Tue 12/9

12:50 pm-9:55 pm

1 stop14h 05m

$609

Washington, D.C.London

DCA - LHR

DCALHR

Washington, D.C. Reagan-National

Tue 9/16

3:35 pm-6:20 am

1 stop9h 45m

London Heathrow

Wed 10/1

5:00 pm-11:07 pm

1 stop11h 07m

$631

Flights are sorted by cheapest round-trip 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?

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 $674. If you’re not able to fly to London Heathrow Airport in September, then February is your next best option. Flight prices from Washington, D.C. to London Heathrow Airport during February average around $684.

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 $759. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $904.

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 $801. 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 $771 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 $697 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 25% 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 September 2025, prices for Washington, D.C. to London Heathrow Airport flights are approximately 10% 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 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

$384

Fastest flight time

7h 05m

Direct flights

Every day
The best one-way flight to London Heathrow Airport from Washington, D.C. in the past 72 hours is $384. The best round-trip flight deal from Washington, D.C. to London Heathrow Airport found on momondo in the last 72 hours is $611.
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 every day.
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
2,918 reviews
Search JetBlue flights
PLAYPriceFrom $372Free CancellationRating
7.0
103 reviews
Search PLAY flights
Scandinavian AirlinesPriceFrom $409Free CancellationRating
7.4
1,480 reviews
Search Scandinavian Airlines flights
DeltaPriceFrom $421Free CancellationRating
7.9
7,973 reviews
Search Delta flights
IcelandairPriceFrom $433Free CancellationRating
7.0
544 reviews
Search Icelandair flights
TAP AIR PORTUGALPriceFrom $441Free CancellationRating
7.1
1,967 reviews
Search TAP AIR PORTUGAL flights
LufthansaPriceFrom $447Free CancellationRating
6.8
7,385 reviews
Search Lufthansa flights
Virgin AtlanticPriceFrom $497Free CancellationRating
7.4
662 reviews
Search Virgin Atlantic flights
American AirlinesPriceFrom $497Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $506Free CancellationRating
7.4
8,937 reviews
Search United Airlines flights

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

    Delta flight deals from Washington, D.C. to London Heathrow Airport start from $421 round-trip. Over the 2 Delta flights for this route in a normal week, average airfare is usually $800 round-trip - but some users have found much cheaper deals with momondo.

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

    Across 1,382 KLM reviews on momondo, the average score is 7.8/10. KLM flies from Washington, D.C. to London Heathrow Airport about 2 times each week, with ticket deals ranging from $520 to $615. 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
Luton
Dover
Slough
Milton Keynes
Hayes
Guildford
Dartford
Stansted
Crawley
Chelmsford
Brentwood
Salisbury
Ilford
Folkestone
Colchester
Swindon
Stratford-upon-Avon
Watford

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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