$319 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 4/9. 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, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Washington

 
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 round-trip prices found by our users on KAYAK in the last 72 hours
Seattle
Seattle2 stops$518
Spokane
Spokane2 stops$653
Pasco
Pasco2 stops$739
Bellingham
Bellingham1 stop$898
Seattle
Seattle2 stops$518
Spokane
Spokane2 stops$653
Pasco
Pasco2 stops$739
Bellingham
Bellingham1 stop$898

Book Cheap London to Washington Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip 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 round-trip flight deals from London to Washington

Thu, Jan 29 - Wed, Feb 4
SWISS Logo
6:40 pm - 9:12 pm
LGW
-
SEA
34h 32m
2 stops
SWISS Logo
1:17 pm - 5:50 pm
SEA
-
LGW
20h 33m
2 stops
$518SWISS
Wed, Jan 28 - Tue, Feb 3
Delta Logo
6:30 am - 11:50 am
LHR
-
SEA
13h 20m
1 stop
Delta Logo
6:25 pm - 11:55 am
SEA
-
LHR
9h 30mnonstop
$518Delta
Sun, Jan 25 - Mon, Mar 16
Delta Logo
8:40 am - 11:50 am
LHR
-
SEA
35h 10m
1 stop
Delta Logo
5:40 pm - 10:30 am
SEA
-
LHR
9h 50mnonstop
$519Delta
Wed, May 6 - Wed, Sep 16
Virgin Atlantic Logo
5:40 pm - 8:06 pm
LHR
-
SEA
10h 26mnonstop
Virgin Atlantic Logo
6:20 pm - 12:10 pm
SEA
-
LHR
9h 50mnonstop
$525Virgin Atlantic
Fri, Apr 10 - Mon, Apr 20
Icelandair Logo
3:40 pm - 8:40 pm
LGW
-
SEA
13h 00m
1 stop
Icelandair Logo
7:00 pm - 2:40 pm
SEA
-
LGW
11h 40m
1 stop
$551Icelandair
Wed, Feb 18 - Tue, Feb 24
Icelandair Logo
11:55 am - 5:00 pm
LGW
-
SEA
13h 05m
1 stop
Icelandair Logo
2:35 pm - 10:55 am
SEA
-
LGW
12h 20m
1 stop
$552Icelandair
Tue, Feb 3 - Tue, Feb 24
Virgin Atlantic Logo
5:50 pm - 11:40 am
LCY
-
SEA
25h 50m
1 stop
Virgin Atlantic Logo
3:05 pm - 4:35 pm
SEA
-
LCY
17h 30m
1 stop
$562Virgin Atlantic
Mon, Feb 9 - Sun, Feb 15
British Airways Logo
1:45 pm - 3:55 pm
LHR
-
PDX
10h 10mnonstop
British Airways Logo
5:45 pm - 11:20 am
PDX
-
LHR
9h 35mnonstop
$595British Airways
Tue, Feb 3 - Sun, Feb 8
British Airways Logo
11:45 am - 10:17 pm
LGW
-
PDX
42h 32m
2 stops
British Airways Logo
2:18 pm - 7:00 pm
PDX
-
LGW
44h 42m
2 stops
$734British Airways
Sat, Mar 14 - Sun, Mar 29
American Airlines Logo
11:20 am - 10:56 am
LGW
-
PDX
30h 36m
2 stops
American Airlines Logo
11:59 pm - 6:50 am
PDX
-
LGW
22h 51m
2 stops
$743American Airlines
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 $535 round-trip. 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 $535.

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

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 2 stops layover the cheapest option at $741 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 $644 (return) on average. On the other hand, the most expensive months are July and August, when the average cost of round-trip tickets is $901 and $865 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 Wednesday, 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 the flight from London to Washington, you should book around 3 weeks before departure, which saves you about 17% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 19 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$333
Best time to beat the crowds but there is an average 30% increase in price.
Most popular time to fly with an average 43% increase in price.
Flight from London Stansted Airport to Portland

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 travelers 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 round-trip 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 in the evening, when round-trip flights cost $812 on average. Morning departures are around 4% more expensive than evening flights, on average. The most expensive time of day to fly to Washington is generally in the morning, which is peak travel time and where the average cost of a ticket is $848.

Reviews of the top 5 airlines serving 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.
7.9
DeltaOverall score based on 8040 reviews
8.5Crew
7.8Entertainment
8.1Boarding
7.9Comfort
7.2Food
Airline reviews

I have diamond medallion status and usually we are in comfort plus . We were in main this time ( which was fine ) and my husband wanted wine . I have at least 10 vouchers for drinks that are good for this year and next! The attendant would not take the picture of the voucher as proof and never came back to check as She asked me to pull it up on delta Wi-Fi. Instead my husband just used his Amex to buy the wine . Disappointing!!!

10.0 ExcellentAnne, Jan 2026
MCO - DTW
Read more Delta reviews

I have diamond medallion status and usually we are in comfort plus . We were in main this time ( which was fine ) and my husband wanted wine . I have at least 10 vouchers for drinks that are good for this year and next! The attendant would not take the picture of the voucher as proof and never came back to check as She asked me to pull it up on delta Wi-Fi. Instead my husband just used his Amex to buy the wine . Disappointing!!!

Food is basically Sun Chips, cookies or Cheezits. I had an exit row seat so I had plenty of room. The crew was very nice and efficient. Pilot kept us informed. Pretty good flight.

Air travel sucks. It continues to be awful for all airlines. No shame on delta alone.

This flight was no comparison to our prior flight. I'm thinking it all has to do with the age of the aircraft.

2 of the seats in row 31 the entertainment system was not working, and one seat the tray table did not go all the way down. Flight arrived early and departed on time which was great.

Flight was operated by Virgin Atlantic and it was up to their usual high standard. Minor grips about some issues, but they are really first world issues and as a whole, was an excellent flight.

I paid for a business class ticket on Delta. It was sourced to Virgin Atlantic. They changed out the aircraft which had fewer upper class tickets. Even though I'd checked into the lounge, was receiving alerts via kayak about the delay and changes; no one informed me that the seat would be changed - until I attempted to board and was told that I would have an economy seat or they could search to put me on another airline. Even the flight crew were informed of this change (10 passengers were bumped out of Upper Class) around 2 pm (1400) time. Hours would have helped to consider alternatives instead of making a last minute change. There needs to be compensation from both Delta and Virgin given this change in service/experience.

DELTA does a terrific job making sure you are well taken care of during the flight, gives you assurance before the flight through numerous email notifications about your upcoming flight & lastly good follow up after the flight making sure your needs were mat. It has been, is & will continue to be my carrier of choice in all my future travels. Good Job DELTA

The customer service before board was very rude and when I expressed my concerns about making the connecting flight she laughed and told me I bought the wrong ticket. I explained once it showed the flight was delayed it no longer let me change seats or anything. I was trying to upgrade to make sure I would get to the next gate on time.

Movie selection was meh. Food was great. Crew as always great. I paid for premium because that’s the only way not to feel like a sardine. That’s how economy should be imo. Sadly passengers have to pay an extra $1000 to get what they should at base price but that’s all airlines. The airline industry in general treats passengers as cargo.

Food has been disappointing in both legs of flight to india

Great staff great experience, made a 2 hour delay very bearable

Great staff, great experience, made a 2 hour delay very bearable

Food was the worst I’ve had on a VA flight. Normally it’s a lot better

I was my pleasure to fly virgin on my birthday for my first solo trip ever 🫶🏼

These are one of the older seat arrangements facing away from the windows! Not particularly convenient sets. No storage spaces. NO COAT HANGING HOOKS. Inconvenient business class seat compared to any other airlines of similar class. Staff are excellent! Extremely professional, friendly. Food is good too.

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.

Flight was delayed because of a bird strike. They had another plane available within 45 minutes.

The business class seats are dated and uncomfortable. The space is bare minimum and there is absolutely no privacy. For $4K, this is not what I expect.

Flight, food and crew were all good, friendly and very satisfactory.

Lost luggage after 2 days no word leaving on cruise no stuff or clothes

Staff's did their best to make everyone comfortable and I appreciate them for it

Pathetic check in experience once again. Not enough staff scheduled at bag drop or for special assistance at LHR. Really need to rethink the whole self check in procedure. The crew was good. A very decent selection of special meals in this leg as compared to the JFK-LHR leg.

Very clean and comfortable cabin. Amazing Mediterranean salad for lunch before landing. Great range of films to watch. Really quiet and easy to sleep on the flight also. The initial food was a bit weird: odd fried chicken pieces in some weird white gloop, but that would be my lack of cultural knowledge on the grub. Salad more than made up for it at the other end. Staff were super attentive and helpful. Great and easy flight

I flew Business Class. Rory, one of the Cabin stewards, was attentive, explained the menu, provided appropriate drinks. was

The flight crew were friendly and attentive. Food was good and they passed out ice cream and drinks awhile after Lunch was done. The ice cream was a nice treat! I found several movies to watch during the flight. There was many movies and tv shows to choose from. We flew Premium economy and there was enough leg room to be comfortable. The seats were also comfortable. I would fly AA again if the airfare isn’t expensive.

Gate check bags that had to be gate checked because of first flight being a small flight are missing. British airways lost the luggage and haven’t met up with them yet!

Food - Non-Existent. You pay for everything. It is strictly Pay-to-Play!

The Experience Was Torture Spend a few extra dollars and avoid Icelandair at all costs. There is absolutely no refreshments, no food, no drinks. Only water, coffee, tea are free and at only half a tiny cup. Entertainment is limited selection of films, shows and mostly outdated. The seats are smaller than usual, with no cushion, no pillows, no blankets. First time in my life have I witness an airline asking for donations in spare change for a charity. With all the money Icelandair saves by starving the passenger, they can afford to give this charity on their own.

Again, we paid $ 328.00 for specific seats are were assigned those seats.

Having been prepared for paying for everything on board other than water, coffee and tea the service was OK. Food and drink is expensive but the food was OK if limited in scope. Plane was clean and obviously well serviced. After complaining about having to walk in wind and rain to a get a bus to the airport the same thing happened at Portland. I’m sure you could get a terminal gate flight, complimentary food and drink for not much more money without traipsing through rain and slush in Reykjavik. Not bad but not great.

If there was a disclaimer regarding food service or lack thereof, l missed it. If l had known l would have prepared better. Same with transferring at Reykjavik. No information about disembarking via stairs into rain, slush and puddles deep enough to swallow a foot. After being treated to haute cuisine restaurants and warm inviting environment during the flight, the airport is, let’s be kind, disappointing. Plane was comfortable, Airbus, staff were welcoming enough. I would likely try the route again. Maybe have a night and day in Iceland. Maybe not.

The boarding process seem to take longer than necessary, resulting in a 20+ minute delay

It was too cold in the plane my feet froze

Service was excellent. Food and drinks were very good except for a greasy lump of a donut at the end of the flight that left us both feeling internally disgusted.

Seat was hard and uncomfortable and the temperature too warm and uncomfortable.

No meals included on this long international flight. Most airlines will offer you a meal when flying internationally. Not Icelandair. Your included choices are water and coffee. Poor customer service. The airport was also very confusing.

Check-in experience, for business call please provide a premium experience

Lost my luggage, ran out of food choices in business class, ground crew was completely unapologetic.

Excellent. The crew and flight were great. Checking in was easy and everyone was very helpful.

Entertainment devices on A380 need to be fixed, the seats might do with updates.

Everything. Employees offered to help me because I had to use a cane.

Check-in and boarding were great. On flight staff were rude and disrespectful. Paid for extra room and found it incredibly cramped. Bathrooms kept in poor condition. Overall negative experience.

Great seat in premium economy, great food and drinks throughout lots of in flight entertainment. 1 hour 40 min delayed flying out , 2 1/2 hour wait at passport control in tampa

My seat cushion was poor. The cushion was compressed and was uncomfortable for such a long flight.

I was in a bulkhead seat and my tray table wasn't level. Eating was difficult.

Audi visual not working for a whole group of seats in first class. How does a plane leave the main hub in such poor condition? How much that we can’t see so immediately is also compromised?

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.