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Cheap flights from Washington, D.C. to London Heathrow Airport from £167

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 13/8. 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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Cheap return flights

KAYAK's recommended return flight deals from the most popular airlines that fly from Washington, D.C. to London.
Scandinavian Airlines Logo
22:05 - 21:40IAD-LHR
18h 35m1 stop
Scandinavian Airlines Logo
06:40 - 19:59LHR-IAD
18h 19m1 stop
£351Scandinavian Airlines
Find Deal
Tue, 19 Aug - Thu, 28 Aug
Scandinavian Airlines Logo
22:05 - 16:00IAD-LHR
12h 55m1 stop
Scandinavian Airlines Logo
07:05 - 19:59LHR-IAD
17h 54m2 stops
£356Scandinavian Airlines
Find Deal
Wed, 20 Aug - Wed, 27 Aug
Iberia Logo
17:40 - 06:15IAD-LHR
7h 35mdirect
Iberia Logo
17:00 - 20:10LHR-IAD
8h 10mdirect
£405Iberia
Find Deal
Wed, 23 Apr - Wed, 30 Apr
Icelandair Logo
20:30 - 20:20BWI-LHR
18h 50m1 stop
Icelandair Logo
13:05 - 19:25LHR-BWI
11h 20m1 stop
£405Icelandair
Find Deal
Tue, 29 Apr - Tue, 6 May
Icelandair Logo
20:30 - 20:20BWI-LHR
18h 50m1 stop
Icelandair Logo
13:05 - 19:25LHR-BWI
11h 20m1 stop
£411Icelandair
Find Deal
Tue, 29 Apr - Sat, 10 May
Iberia Logo
21:20 - 09:35BWI-LHR
7h 15mdirect
Iberia Logo
16:35 - 19:35LHR-BWI
8h 00mdirect
£436Iberia
Find Deal
Sun, 21 Sep - Tue, 30 Sep
British Airways Logo
17:49 - 08:15DCA-LHR
9h 26m1 stop
British Airways Logo
09:45 - 15:55LHR-DCA
11h 10m1 stop
£472British Airways
Find Deal
Mon, 5 May - Tue, 13 May
British Airways Logo
16:52 - 12:30IAD-LHR
14h 38m1 stop
British Airways Logo
17:10 - 15:00LHR-IAD
26h 50m1 stop
£477British Airways
Find Deal
Wed, 16 Apr - Wed, 23 Apr
Virgin Atlantic Logo
12:00 - 11:10BWI-LHR
18h 10m1 stop
Virgin Atlantic Logo
11:30 - 23:22LHR-BWI
16h 52m2 stops
£484Virgin Atlantic
Find Deal
Tue, 22 Apr - Thu, 1 May
Virgin Atlantic Logo
14:04 - 08:55BWI-LHR
13h 51m2 stops
Virgin Atlantic Logo
11:30 - 23:22LHR-BWI
16h 52m2 stops
£488Virgin Atlantic
Find Deal
Tue, 22 Apr - Thu, 1 May

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
19 Aug
IAD22:05Washington, D.C. Dulles Intl
18h 35m
1 stop
LHR21:40London Heathrow
28 Aug
LHR06:40London Heathrow
18h 19m
1 stop
IAD19:59Washington, D.C. Dulles Intl
Scandinavian Airlines
20 Aug
IAD22:05Washington, D.C. Dulles Intl
12h 55m
1 stop
LHR16:00London Heathrow
27 Aug
LHR07:05London Heathrow
17h 54m
2 stops
IAD19:59Washington, D.C. Dulles Intl
Scandinavian Airlines
11 Sept
IAD22:05Washington, D.C. Dulles Intl
54h 30m
2 stops
LHR09:35London Heathrow
15 Sept
LHR06:40London Heathrow
18h 19m
1 stop
IAD19:59Washington, 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
29 Apr
BWI20:30Baltimore/Washington
18h 50m
1 stop
LHR20:20London Heathrow
6 May
LHR13:05London Heathrow
11h 20m
1 stop
BWI19:25Baltimore/Washington
Icelandair
29 Apr
BWI20:30Baltimore/Washington
18h 50m
1 stop
LHR20:20London Heathrow
10 May
LHR13:05London Heathrow
11h 20m
1 stop
BWI19:25Baltimore/Washington
Icelandair
27 Apr
BWI20:30Baltimore/Washington
10h 25m
1 stop
LHR11:55London Heathrow
6 May
LHR21:25London Heathrow
27h 00m
1 stop
BWI19:25Baltimore/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?

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 £517. The month of February is another great option to travel to London Heathrow Airport, with average flight prices from Washington, D.C. averaging around £527.

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 Monday. momondo users have found tickets for Monday departures for as low as £569. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Saturday is £678.

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 £0. 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 £653 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 Baltimore/Washington 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 20 weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £604 when searching 20 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 £577 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 April 2025, prices for Washington, D.C. to London Heathrow Airport flights are approximately 5% 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 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

£167

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 £167. The best return flight deal from Washington, D.C. to London Heathrow Airport found on momondo in the last 72 hours is £351.
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?

    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
IcelandairPriceFrom £371Free CancellationRating
7.0
476 reviews
Search Icelandair flights
IberiaPriceFrom £431Free CancellationRating
7.0
2,655 reviews
Search Iberia flights
Air FrancePriceFrom £442Free CancellationRating
7.4
1,425 reviews
Search Air France flights
British AirwaysPriceFrom £442Free CancellationRating
6.6
6,715 reviews
Search British Airways flights
Virgin AtlanticPriceFrom £451Free CancellationRating
7.4
636 reviews
Search Virgin Atlantic flights
KLMPriceFrom £481Free CancellationRating
7.8
1,323 reviews
Search KLM flights
LufthansaPriceFrom £511Free CancellationRating
6.7
6,963 reviews
Search Lufthansa flights
United AirlinesPriceFrom £513Free CancellationRating
7.4
8,615 reviews
Search United 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 £621. Generally, KLM has 6 flights on this route every week with an average price of £752. KLM is rated 7.8/10 by our users.

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

    Across 1,425 Air France reviews on momondo, the average score is 7.4/10. Air France flies from Washington, D.C. to London Heathrow Airport about 6 times each week, with ticket deals ranging from £570 to £725. Price data is based on momondo searches in the last 72 hours.


Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Eastbourne
Milton Keynes
Luton
Slough
Southend-on-Sea
Stratford-upon-Avon
Swindon
Gatwick
Ipswich
Northampton
Maidstone
Canterbury
Margate
Dartford
Hounslow
Ilford
Salisbury
Colchester
Guildford
Swanage

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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