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Cheap flights from Washington, D.C. to London from $205

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 10/3. 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

Scandinavian Airlines Logo
8:30 pm - 12:55 pmIAD-LHR
35h 25m2 stops
Scandinavian Airlines Logo
6:40 am - 6:50 pmLHR-IAD
17h 10m2 stops
$488Scandinavian Airlines
Find Deal
Wed, Nov 12 - Sat, Nov 15
Icelandair Logo
11:15 pm - 11:55 amIAD-LHR
31h 40m1 stop
Icelandair Logo
1:05 pm - 7:20 pmLHR-IAD
11h 15m1 stop
$489Icelandair
Find Deal
Sun, Sep 28 - Tue, Oct 7
Virgin Atlantic Logo
5:50 pm - 6:20 amIAD-LHR
7h 30mnonstop
Virgin Atlantic Logo
9:00 am - 4:20 pmLHR-IAD
12h 20m1 stop
$536Virgin Atlantic
Find Deal
Sun, Sep 28 - Tue, Oct 7
Virgin Atlantic Logo
8:40 pm - 1:30 pmDCA-LHR
11h 50m1 stop
Virgin Atlantic Logo
12:45 pm - 7:40 pmLHR-DCA
11h 55m1 stop
$538Virgin Atlantic
Find Deal
Sun, Sep 28 - Tue, Oct 7
United Airlines Logo
3:00 pm - 5:55 amDCA-LHR
9h 55m1 stop
United Airlines Logo
12:00 pm - 9:37 pmLHR-DCA
14h 37m1 stop
$557United Airlines
Find Deal
Mon, Oct 6 - Wed, Oct 22
United Airlines Logo
1:10 pm - 5:55 amBWI-LHR
11h 45m1 stop
United Airlines Logo
1:25 pm - 9:19 pmLHR-BWI
36h 54m2 stops
$579United Airlines
Find Deal
Tue, Dec 2 - Tue, Dec 9
British Airways Logo
9:35 pm - 9:50 amBWI-LHR
7h 15mnonstop
British Airways Logo
3:25 pm - 6:45 pmLHR-BWI
8h 20mnonstop
$581British Airways
Find Deal
Mon, Oct 13 - Wed, Dec 3
British Airways Logo
9:35 pm - 9:50 amBWI-LHR
7h 15mnonstop
British Airways Logo
3:25 pm - 6:45 pmLHR-BWI
8h 20mnonstop
$582British Airways
Find Deal
Mon, Oct 13 - Wed, Dec 3
Delta Logo
5:00 pm - 9:15 amDCA-LHR
11h 15m1 stop
Delta Logo
6:30 am - 4:35 pmLHR-DCA
15h 05m2 stops
$595Delta
Find Deal
Wed, Oct 15 - Tue, Nov 18
Delta Logo
7:35 pm - 1:30 pmDCA-LHR
12h 55m1 stop
Delta Logo
11:45 am - 10:07 pmLHR-DCA
15h 22m2 stops
$596Delta
Find Deal
Wed, Oct 15 - Wed, Oct 22

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
Nov 12
IAD8:30 pmWashington, D.C. Dulles Intl
35h 25m
2 stops
LHR12:55 pmLondon Heathrow
Nov 15
LHR6:40 amLondon Heathrow
17h 10m
2 stops
IAD6:50 pmWashington, D.C. Dulles Intl
$488
Find similar
Scandinavian Airlines
Oct 19
IAD10:05 pmWashington, D.C. Dulles Intl
33h 50m
2 stops
LHR12:55 pmLondon Heathrow
Oct 22
LHR7:05 amLondon Heathrow
17h 54m
2 stops
IAD7:59 pmWashington, D.C. Dulles Intl
$528
Find similar
Scandinavian Airlines
Nov 6
BWI6:18 amBaltimore/Washington
28h 42m
2 stops
LHR4:00 pmLondon Heathrow
Nov 13
LHR6:40 amLondon Heathrow
20h 29m
2 stops
BWI10:09 pmBaltimore/Washington
$564
Find similar

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

Our best TAP AIR PORTUGAL deals on Washington, D.C. to London Heathrow Airport flight tickets
TAP AIR PORTUGAL
Sep 22
IAD5:45 pmWashington, D.C. Dulles Intl
14h 00m
1 stop
LHR12:45 pmLondon Heathrow
Dec 11
LHR6:00 amLondon Heathrow
14h 15m
1 stop
IAD3:15 pmWashington, D.C. Dulles Intl
$512
Find similar
TAP AIR PORTUGAL
Nov 3
IAD5:30 pmWashington, D.C. Dulles Intl
23h 05m
1 stop
LHR9:35 pmLondon Heathrow
Nov 13
LHR6:00 amLondon Heathrow
14h 15m
1 stop
IAD3:15 pmWashington, D.C. Dulles Intl
$515
Find similar
TAP AIR PORTUGAL
Dec 11
IAD5:30 pmWashington, D.C. Dulles Intl
14h 10m
1 stop
LHR12:40 pmLondon Heathrow
Dec 16
LHR6:30 pmLondon Heathrow
31h 30m
1 stop
IAD9:00 pmWashington, D.C. Dulles Intl
$519
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 17, 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 11/12

8:30 pm-12:55 pm

2 stops35h 25m

London Heathrow

Sat 11/15

6:40 am-6:50 pm

2 stops17h 10m

$488

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 9/28

11:15 pm-11:55 am

1 stop31h 40m

London Heathrow

Tue 10/7

1:05 pm-7:20 pm

1 stop11h 15m

$489

Washington, D.C.London

IAD - LHR

IADLHR

Washington, D.C. Dulles Intl

Sun 9/28

5:50 pm-6:20 am

Nonstop7h 30m

London Heathrow

Tue 10/7

9:00 am-4:20 pm

1 stop12h 20m

$536

Washington, D.C.London

DCA - LHR

DCALHR

Washington, D.C. Reagan-National

Sun 9/28

8:40 pm-1:30 pm

1 stop11h 50m

London Heathrow

Tue 10/7

12:45 pm-7:40 pm

1 stop11h 55m

$538

Washington, D.C.London

DCA - LHR

DCALHR

Washington, D.C. Reagan-National

Mon 10/6

3:00 pm-5:55 am

1 stop9h 55m

London Heathrow

Wed 10/22

12:00 pm-9:37 pm

1 stop14h 37m

$557

BaltimoreLondon

BWI - LHR

BWILHR

Baltimore/Washington

Tue 12/2

1:10 pm-5:55 am

1 stop11h 45m

London Heathrow

Tue 12/9

1:25 pm-9:19 pm

2 stops36h 54m

$579

BaltimoreLondon

BWI - LHR

BWILHR

Baltimore/Washington

Mon 10/13

9:35 pm-9:50 am

Nonstop7h 15m

London Heathrow

Wed 12/3

3:25 pm-6:45 pm

Nonstop8h 20m

$581

BaltimoreLondon

BWI - LHR

BWILHR

Baltimore/Washington

Mon 10/13

9:35 pm-9:50 am

Nonstop7h 15m

London Heathrow

Wed 12/3

3:25 pm-6:45 pm

Nonstop8h 20m

$582

Washington, D.C.London

DCA - LHR

DCALHR

Washington, D.C. Reagan-National

Wed 10/15

5:00 pm-9:15 am

1 stop11h 15m

London Heathrow

Tue 11/18

6:30 am-4:35 pm

2 stops15h 05m

$595

Washington, D.C.London

DCA - LHR

DCALHR

Washington, D.C. Reagan-National

Wed 10/15

7:35 pm-1:30 pm

1 stop12h 55m

London Heathrow

Wed 10/22

11:45 am-10:07 pm

2 stops15h 22m

$596

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 cheapest month to fly to London Heathrow Airport?

The month of August is, on average, the cheapest month to fly to London Heathrow Airport from Washington, D.C., with most prices found around $659. If you’re not able to fly to London Heathrow Airport in August, then September is your next best option. Flight prices from Washington, D.C. to London Heathrow Airport during September average around $661.

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 $762. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $906.

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 morning. momondo users have found flights departing from Washington, D.C. to London Heathrow Airport in the morning for as low as $708. 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 $822.

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 $756 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 $710 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 21% 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 $648.
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
2,914 reviews
Search JetBlue flights
PLAYPriceFrom $372Free CancellationRating
7.0
103 reviews
Search PLAY flights
DeltaPriceFrom $421Free CancellationRating
7.9
7,961 reviews
Search Delta flights
Scandinavian AirlinesPriceFrom $424Free CancellationRating
7.4
1,486 reviews
Search Scandinavian Airlines flights
IcelandairPriceFrom $433Free CancellationRating
7.0
545 reviews
Search Icelandair flights
TAP AIR PORTUGALPriceFrom $441Free CancellationRating
7.1
1,977 reviews
Search TAP AIR PORTUGAL flights
LufthansaPriceFrom $447Free CancellationRating
6.8
7,409 reviews
Search Lufthansa flights
Virgin AtlanticPriceFrom $497Free CancellationRating
7.4
664 reviews
Search Virgin Atlantic flights
American AirlinesPriceFrom $497Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $506Free CancellationRating
7.4
8,926 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 6 Delta flights for this route in a normal week, average airfare is usually $797 round-trip - but some users have found much cheaper deals with momondo.

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

    Across 1,386 KLM reviews on momondo, the average score is 7.8/10. KLM flies from Washington, D.C. to London Heathrow Airport about 6 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
Dover
Luton
Slough
Milton Keynes
Hayes
Guildford
Dartford
Crawley
Stansted
Chelmsford
Salisbury
Brentwood
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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