£391 Find Cheap Flights from London to Washington

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from London to Washington departing on 18/10. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

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These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Washington.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Washington.
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Cheap Flights from London to Washington

Cheapest return prices found by our users on KAYAK in the last 72 hours
Seattle
Seattledirect£477
Spokane
Spokane2 stops£521
Seattle
Seattledirect£477
Spokane
Spokane2 stops£521

Book Cheap London to Washington Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from London to Washington that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from London to Washington

Tue, 9 Sep - Tue, 16 Sep
Virgin Atlantic Logo
17:25 - 19:50LHR-SEA
10h 25mdirect
Virgin Atlantic Logo
17:35 - 11:20SEA-LHR
9h 45mdirect
£477Virgin Atlantic
Find Deal
Mon, 22 Sep - Mon, 6 Oct
 Logo
21:05 - 10:20LGW-SEA
45h 15m2 stops
 Logo
21:30 - 06:20SEA-LGW
24h 50m1 stop
Sun, 28 Sep - Sat, 11 Oct
 Logo
06:30 - 14:16LHR-SEA
15h 46m2 stops
 Logo
10:00 - 09:35SEA-LHR
15h 35m2 stops
Thu, 9 Oct - Fri, 24 Oct
Icelandair Logo
15:40 - 20:40LGW-SEA
13h 00m1 stop
Icelandair Logo
19:00 - 14:40SEA-LGW
11h 40m1 stop
£478Icelandair
Find Deal
Fri, 10 Oct - Sun, 26 Oct
Icelandair Logo
15:40 - 20:40LGW-SEA
13h 00m1 stop
Icelandair Logo
15:35 - 13:40SEA-LGW
15h 05m1 stop
£486Icelandair
Find Deal
Wed, 3 Dec - Tue, 9 Dec
Air France Logo
06:20 - 13:20LHR-SEA
15h 00m1 stop
Air France Logo
16:45 - 10:30SEA-LHR
9h 45mdirect
£498Air France
Find Deal
Mon, 22 Sep - Tue, 14 Oct
British Airways Logo
12:15 - 20:09LHR-SEA
15h 54m1 stop
British Airways Logo
10:32 - 09:00SEA-LHR
14h 28m1 stop
£500British Airways
Find Deal
Mon, 1 Dec - Tue, 9 Dec
British Airways Logo
14:55 - 16:55LHR-SEA
10h 00mdirect
British Airways Logo
13:44 - 10:25SEA-LHR
12h 41m1 stop
£503British Airways
Find Deal
Mon, 8 Sep - Fri, 26 Sep
KLM Logo
09:20 - 16:05LCY-SEA
14h 45m1 stop
KLM Logo
13:55 - 11:40SEA-LCY
13h 45m1 stop
£557KLM
Find Deal
Mon, 8 Sep - Fri, 26 Sep
KLM Logo
09:20 - 16:05LCY-SEA
14h 45m1 stop
KLM Logo
13:55 - 11:40SEA-LCY
13h 45m1 stop
£563KLM
Find Deal
Booking Insights

KAYAK's insights & trends for London to Washington flights

Get data-powered insights and trends into flights from London to Washington to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest London to Washington flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to Washington from London found in the last 72 hours was to Seattle, at £477 return. The most popular route is from London Heathrow Airport (LHR) to Seattle (SEA), and the cheapest round-trip airline ticket found on this route in the last 72 hours was £477.

Can I save money by flying with a stopover from London to Washington?

The average return price for all direct flights, flights with one stopover, and flights with two stopovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a stopover may cost you more time, but you can also save money on the route, with a 2 stops stopover the cheapest option at £1,133 on average.

What is the cheapest month to fly from London to Washington?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from London to Washington, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from London to Washington is January, when tickets cost £471 (return) on average. On the other hand, the most expensive months are August and July, when the average cost of return tickets is £700 and £685 respectively.

What’s the cheapest day of the week to fly from London to Washington?

The average price of all round-trip flights from London to Washington clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to Washington on a Wednesday and more expensive on a Sunday. On your return trip to London, you should consider flying back on a Tuesday, and avoid Fridays for better deals.

How far in advance should I book a flight from London to Washington?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from London to Washington, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below-average price on a flight from London to Washington, you should book around 4 weeks before departure, which saves you about 25% compared to booking last-minute. For the absolute cheapest price, our data suggests you should book 24 weeks before departure.

Good to know - Cheap tickets from London to Washington

Low seasonJanuary
Cheapest flight£391
Best time to beat the crowds (7% less expensive on average)
Most popular time to fly (38% more expensive on average)
Flight from London Heathrow Airport to Seattle

FAQs - booking Washington flights

  • How does KAYAK find such low prices on flights from London to Washington?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from London to Washington.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from London to Washington?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from London to Washington is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from London to Washington?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly from London to Washington with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from London to Washington?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from London to Washington up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Washington?

    The cheapest time of day to fly to Washington is generally at night, when retur flights cost £698 on average. Morning departures are around 1% cheaper than evening flights, on average. The most expensive time of day to fly to Washington is generally in the evening, which is peak travel time and where the average cost of a ticket is £843.

Reviews of the top 5 airlines flying from London to Washington

 
See real verified KAYAK customer reviews for airlines flying from London to Washington. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from London to Washington? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.8
KLMOverall score based on 1388 reviews
8.4Crew
7.7Comfort
7.1Entertainment
7.8Boarding
7.3Food
Airline reviews

Over 1 Hr delay. No APU so no AC on ground. Plane was hot during boarding and then they closed the doors over 20 minutes before engine start so interior of plane was steamy hot and stuffy. Could have been helped by opening doors until ready to depart.

2.0 MediocrePeter, Aug 2025SAN - AMS
Read more KLM reviews

Over 1 Hr delay. No APU so no AC on ground. Plane was hot during boarding and then they closed the doors over 20 minutes before engine start so interior of plane was steamy hot and stuffy. Could have been helped by opening doors until ready to depart.

Ad experience - been flying many years with them but they are losing out to other carriers with their service and bagage / seating policy. My 2 12-yo kids were not placed with the parent. Absurdity.

Short flight so it was okay. Nice crew, all very pleasant and professional. We were near the back in row 27 so just as we got our drinks, we started our descent so had to drink very quickly!

KLM remains a quality flag carrier airline which maintains its standards whilst all their competitors are lowering theirs.

The baggage drop-off in Stuttgart is bad: after online check-in you cannot use the automated baggage drop off as indicated on the website. You can use the terminals but have to cue to 1 of three open and slowly working counters to drop the bags. took about 45 minutes wait time.

Our first flight was delayed so we missed our connecting flight. However it was easy to book a later flight on their app.

Klm start boarding while somw air issue in the plan

The service was great. However the lounge only gets passing grade

Cabin crew professional, polite and friendly, boarding was seemless, but come on KLM surely you can do better than a pack of cheesy biscuits as an inflight snack

Cabin crew were excellent, very proffesional, polite and friendly, in flight snack was underwhelming, a packet of cheese biscuits, im sure KLM could run to a sandwich!

I don't understand the concept of paying to get your personal luggage onboard and then asked to check it in.... either sell the space or don't, its a hassle to carry those all through the airport just to make a check in at the last minute.

The food was great and the service and attitude was amazing!!

It was a great experience. The only thing I would have changed was that the bathrooms were never cleaned and they got very dirty.

Old airplanes small seats expensive tickets, not as expected overall and not comfortable according to the price

It was an OK flight with below mediocre service by their flight attendants

Wasted a lot of time trying to find the CDG lounge - it was not next to the connecting flight gate like the Air France staff said.

My experience was good overall, the quality of the food really decreased! There used to be a choice between meat and fish now it’s between chicken and pasta! In the choices of entertainment meditation has been added which is very good. Soft chair workout to improve blood circulation and avoid phlebitis should be added.

Much better than the major US Carriers especially in Biz Class.

I wish that the meal included a vegetable or even a salad instead of couscous! Why serve chicken with rice AND couscous? Service was good overall though a bit lacking in friendliness. Usually on air france I've been offered a glass of champagne before dinner, wine with dinner, and a digestif after dinner. We were only offered wine this time!

It was not Air France but Air Europa. But confusion over our checked luggage. Whether it was checked all the way to Tenerife or not. It was not. Had to line up again in Departures. At least our Sky Priority was honoured. Flight was fine.

Overall, flight was excellent but check in was very slow for Premium Economy. Economy queue was shorter but we weren't allowed to use it.

The staff was not very polite but the flight was very very nice and comfortable and the entertainment was great

Great crew - old style upper class seats on the older fleet now feels dated

Premium economy more comfortable than economy, but not by much. Did was awful, do not try the omelette. Flight crew were helpful. Flight was delayed by over an hour. Overall but bad, arrived safely and thank God.

Food was excellent. Service was very good. Staff was very helpful to all passengers.

The crew was excellent as ever on Virgin. The special meal was poor unfortunately. More significantly when we arrived at Manchester Airport there was no air bridge provided and we had to exit the plane down a rickety stair case. This is unacceptable for a transatlantic flight. Whilst I understand that this is the airport’s fault at the end of the day the airline is responsible for our transportation and needs to do something.

Super friendly and helpful staff, from check-in desk to cabin crew.

Following a paid seat upgrade for enhanced comfort, I encountered an unacceptable odor in my assigned area. It took three hours for the crew to relocate me, and the replacement seat was unacceptably close to the lavatory, offering no improvement.

Good overall. Cannot fault the airlines. I have had better entertainment systems before ie ice in Emirates but it was not too bad. Food was decent and staff were friendly.

I did not fly by vergin atlantic from bangalore to vasco da gama

Everything sucked. No food, one small glass of water, a tiny coffee, 5.5 hour delay with no customer service. Would never recommend flying them.

The crew was wonderful at check in, the gate and on board. Felt the luggage had more room than the passengers. The seats were smaller than most domestic U.S. airlines. I'm only 5'2" and I had little legroom. There were only 2 bathrooms in coach. Needed more. The flight was very smooth but not the most comfortable.

There was no lounge at Boston for us to use. Typically flying first class overseas comes with lounge privileges. The seats did not recline even a little. My headset only worked on one side. I felt like I was flying on Ryan Air, not Icelandic Air.

Boarded with no problems. Sat on the tarmac for an hour before taking off. We were the last ones on our connecting flight. Didn't think we were going to make it. Our flight to Iceland was similarly delayed. When we've flown other airlines, pilots have tried to make up time while in the air. This doesn't seem to be something that Icelandair does. We made all of our flights, but it was stressful and we didn't think it was going to happen based on the time we arrived.

The flight was delayed and as a consequence we missed our connecting flight. Were stuck for another 6h in Reykyavik. Appreciated that we got a generous food voucher at least. Would have liked to see more information upon arrival including a person waiting for connecting flight travellers and informing already that we will not catch the flight and directing us to the office dealing with the matter; unfortunately that didnt happen and we hence first needed to find out whether flight had indeed left already and then locate the adequate office to help us with booking us on the next connecting flight. Also my suitcase broke and it is not clear whether it is happened on the leg with Iceland Air from DC to Reykyavik or on the leg with Lufthansa from Reykyavik to Frankfurt. Finally, understood that it is a low cost company but at least provision of earplugs for free would have been nice, instead of making them buy.

Great experience on Icelandair flight from Newark to Amsterdam by way of Reykjavík. Courteous and professional staff. Food was solid. Service - outstanding. Cabin was a little warm.

Good service. No complementary food for international flight. WiFi kinda pricey. Got the job done for the right price.

Everything was good. Only issue comes from being vegan and flying. The food options are super limited.

Overall good for an economy fare. IMO the movie selection could be improved. Great that you can now connect bluetooth headphones to the entertainment system.

For a four hour flight, I was disappointed that everything was for purchase except for coffee, tea, or water. The disembarking in Iceland was so inefficient and time-consuming. We landed and stopped in the middle of the tarmac, had to disembark in the rain, and then squeeze into a bus which took us to the airport. Crazy! How does that work in winter?

When we arrived at the airport - 1st step - printing out your boarding pass - no issue. Not long lines as these machines. 2nd step - processing your bag drop off. There was only one associate there to help 10 kiosks. We had a family in front of us for 20 minutes trying to work on the machine and figure out every step for 4 pieces of luggage. My husband alerted the associate who was able to assist the family. Highly suggest that there are more associates to assist in this process. Besides this issue, security check went very quickly. Our flight was direct to Philadelphia. We had to carry our bags down two flights of steps, then out to the tarmac to a bus, then carry our bags up two flights of stairs to the plane. No one on the flight was expecting that long trek. I could see some people were struggling a bit. All in all - great flight crew, plane was clean and food was great!

There were no gluten-free vegan options available, so food was very limited on this flight, and some of the crew weren’t especially helpful about it. To make matters worse, a passenger was sick on board, and although the area was cleaned, the smell lingered for the rest of the journey. On top of that, we ended up circling for an extra hour, which only made the unpleasant situation drag on even longer.

Checking in prior on line and wait time at Gatwick was terrible. I would rate a big fat ZERO.

I checked in to bags, one arrived one was delayed. I did not receive the bag for 4 days - arrived on Tuesday, received bag on Saturday!

It was ok. Our flight was delayed 2 hours, and then again on arrival. The explanation given felt feeble.

The booking agent, cheapflightsfares, messed up, and the information for the seats we paid extra for was not sent to American Airlines. We were separated on the return flight and sent to the lowest economy section. The flight attendant helped arrange seating at the back of the plane to allow my wife and me to sit together.

I liked the comfort of the seats, very attentive crew, and the meals were excellent.

We were kicked off this flight by British Airways due to delays on our connecting flight also operated by British airways and were rebooked on a different carrier which delayed our arrival home by > 26 hours.

Everything about the flight check-in was smooth no line the plane is clean and bathroom

Excellent everywhere but Philly, the most rotten airport in the world.

Everything you need to know for your flight from London to Washington

Cabin class types available on flights to Washington

Cabin classes available on flights to Washington. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.

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