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Cheap flights from Washington, D.C. to London Heathrow Airport from $217

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 Heathrow Airport departing on 8/17. 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

KAYAK's recommended round-trip deals from the most popular airlines that fly from Washington, D.C. to London.
10:05 pm - 4:00 pmIAD-LHR
12h 55m1 stop
6:40 am - 7:59 pmLHR-IAD
18h 19m1 stop
$398Scandinavian Airlines
Find Deal
Fri, May 2 - Mon, May 5
10:05 pm - 4:00 pmIAD-LHR
12h 55m1 stop
7:05 am - 7:59 pmLHR-IAD
17h 54m2 stops
$402Scandinavian Airlines
Find Deal
Fri, May 2 - Mon, May 5
10:40 pm - 11:05 amIAD-LHR
7h 25mnonstop
6:15 am - 3:00 pmLHR-IAD
13h 45m1 stop
$604Iberia
Find Deal
Wed, Apr 23 - Wed, Apr 30
10:40 pm - 11:05 amIAD-LHR
7h 25mnonstop
6:15 am - 3:00 pmLHR-IAD
13h 45m1 stop
$605Iberia
Find Deal
Wed, Apr 23 - Wed, Apr 30
10:15 pm - 10:40 amIAD-LHR
7h 25mnonstop
8:40 am - 4:15 pmLHR-IAD
12h 35m1 stop
$630United Airlines
Find Deal
Wed, May 21 - Fri, May 23
10:40 pm - 11:05 amIAD-LHR
7h 25mnonstop
6:15 am - 12:02 amLHR-IAD
22h 47m2 stops
$647British Airways
Find Deal
Sun, Apr 20 - Thu, May 8
7:25 pm - 7:45 amIAD-LHR
7h 20mnonstop
2:25 pm - 5:25 pmLHR-IAD
8h 00mnonstop
$649British Airways
Find Deal
Wed, Apr 30 - Wed, May 14
6:30 pm - 6:55 amIAD-LHR
7h 25mnonstop
1:45 pm - 4:15 pmLHR-IAD
31h 30m1 stop
$650United Airlines
Find Deal
Wed, Apr 16 - Wed, Apr 23
9:20 pm - 9:35 amBWI-LHR
7h 15mnonstop
3:00 pm - 10:15 pmLHR-BWI
12h 15m1 stop
$679American Airlines
Find Deal
Tue, Apr 22 - Wed, May 7
9:20 pm - 9:35 amBWI-LHR
7h 15mnonstop
4:35 pm - 7:35 pmLHR-BWI
8h 00mnonstop
$699American Airlines
Find Deal
Mon, Apr 21 - Tue, Apr 29

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
May 2
IAD10:05 pmWashington, D.C. Dulles Intl
12h 55m
1 stop
LHR4:00 pmLondon Heathrow
May 5
LHR6:40 amLondon Heathrow
18h 19m
1 stop
IAD7:59 pmWashington, D.C. Dulles Intl
Scandinavian Airlines
May 2
IAD10:05 pmWashington, D.C. Dulles Intl
12h 55m
1 stop
LHR4:00 pmLondon Heathrow
May 5
LHR7:05 amLondon Heathrow
17h 54m
2 stops
IAD7:59 pmWashington, D.C. Dulles Intl
Scandinavian Airlines
May 2
IAD10:05 pmWashington, D.C. Dulles Intl
30h 30m
2 stops
LHR9:35 amLondon Heathrow
May 5
LHR7:05 amLondon Heathrow
17h 54m
2 stops
IAD7:59 pmWashington, D.C. Dulles Intl

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
Apr 27
BWI8:30 pmBaltimore/Washington
10h 25m
1 stop
LHR11:55 amLondon Heathrow
May 3
LHR9:25 pmLondon Heathrow
27h 00m
1 stop
BWI7:25 pmBaltimore/Washington
Icelandair
May 2
IAD8:30 pmWashington, D.C. Dulles Intl
10h 25m
1 stop
LHR11:55 amLondon Heathrow
May 14
LHR9:25 pmLondon Heathrow
26h 55m
1 stop
IAD7:20 pmWashington, D.C. Dulles Intl
Icelandair
May 1
BWI8:30 pmBaltimore/Washington
10h 25m
1 stop
LHR11:55 amLondon Heathrow
May 13
LHR9:25 pmLondon Heathrow
27h 00m
1 stop
BWI7:25 pmBaltimore/Washington

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 October is, on average, the cheapest month to fly to London Heathrow Airport from Washington, D.C., with most prices found around $668. If you’re not able to fly to London Heathrow Airport in October, then February is your next best option. Flight prices from Washington, D.C. to London Heathrow Airport during February average around $681.

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

Our data shows that Tuesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $795. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $928.

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 $691. 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 $853.

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 24 weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around $776 when searching 24 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 $716 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.

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

As of March 2025, prices for Washington, D.C. to London Heathrow Airport flights are approximately 24% 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

$217

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 $217. The best round-trip flight deal from Washington, D.C. to London Heathrow Airport found on momondo in the last 72 hours is $398.
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.

  • 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 15m 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
Scandinavian AirlinesPriceFrom $370Free CancellationRating
7.3
1,325 reviews
Search Scandinavian Airlines flights
PLAYPriceFrom $384Free CancellationRating
6.9
97 reviews
Search PLAY flights
IcelandairPriceFrom $474Free CancellationRating
7.0
476 reviews
Search Icelandair flights
TAP AIR PORTUGALPriceFrom $486Free CancellationRating
7.1
1,827 reviews
Search TAP AIR PORTUGAL flights
Aer LingusPriceFrom $498Free CancellationRating
7.0
1,062 reviews
Search Aer Lingus flights
Air CanadaPriceFrom $549Free CancellationRating
7.0
8,981 reviews
Search Air Canada flights
DeltaPriceFrom $560Free CancellationRating
8.0
7,895 reviews
Search Delta flights
IberiaPriceFrom $562Free CancellationRating
7.0
2,651 reviews
Search Iberia flights
FinnairPriceFrom $571Free CancellationRating
7.6
1,267 reviews
Search Finnair flights
SWISSPriceFrom $572Free CancellationRating
7.5
1,570 reviews
Search SWISS flights
  • Delta Flights From Washington, D.C. to London Heathrow Airport

    Delta flight deals from Washington, D.C. to London Heathrow Airport start from $560 round-trip. Over the 3 Delta flights for this route in a normal week, average airfare is usually $888 round-trip - but some users have found much cheaper deals with momondo.

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

    Across 1,267 Finnair reviews on momondo, the average score is 7.6/10. Finnair flies from Washington, D.C. to London Heathrow Airport about 6 times each week, with ticket deals ranging from $571 to $764. 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
Hounslow
Gatwick
Croydon
Luton
Guildford
Slough
Hayes
Dartford
Stansted
Ilford
Swindon
Dover
Salisbury
Canterbury
Colchester
Milton Keynes
Horley
Wembley
Chelmsford
Eastbourne

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

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