LHR - SEA

$477 Find Cheap Flights from London Heathrow Airport to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Heathrow to Seattle departing on 2/24. 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 Seattle

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Seattle, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Seattle, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$484
Overall average: $609
Icelandair
Sat 2/7Mon 2/9
LHR - SEA • 1 stop
Cheapest non-stop
$508
Typical prices: $683-$908
Virgin Atlantic
Mon 3/9Tue 3/24
LHR - SEA • Non-stop
Our travelers' advice
AI-powered summary based on content written by travel experts. AI can make mistakes.
Virgin's Economy Delight includes extra legroom.
Heathrow can be overcrowded, so arrive early.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Icelandair
Cheapest • from $482 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
3 weeks
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 17% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
February
Cheapest • 19% price drop
August
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
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We hope you love your trip to Seattle!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from Heathrow to Seattle (LHR-SEA)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Heathrow to Seattle 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 Heathrow to Seattle

Sat, Feb 7 - Mon, Feb 9
Icelandair Logo
12:15 pm - 5:00 pm
LHR
-
SEA
12h 45m
1 stop
Icelandair Logo
2:35 pm - 10:50 am
SEA
-
LHR
12h 15m
1 stop
$484Icelandair
Sun, Mar 1 - Thu, Mar 5
Icelandair Logo
8:35 pm - 5:00 pm
LHR
-
SEA
28h 25m
1 stop
Icelandair Logo
2:35 pm - 10:50 am
SEA
-
LHR
12h 15m
1 stop
$492Icelandair
Wed, Mar 4 - Mon, Mar 9
Multiple Airlines Logo
6:35 am - 1:20 pm
LHR
-
SEA
14h 45m
1 stop
Multiple Airlines Logo
8:00 pm - 10:10 am
SEA
-
LHR
31h 10m
2 stops
$495Multiple Airlines
Fri, Mar 20 - Mon, Mar 23
Multiple Airlines Logo
6:35 am - 2:20 pm
LHR
-
SEA
14h 45m
1 stop
Multiple Airlines Logo
7:00 am - 5:55 am
SEA
-
LHR
15h 55m
1 stop
$498Multiple Airlines
Thu, Feb 12 - Fri, Feb 20
Austrian Airlines Logo
1:35 pm - 7:03 pm
LHR
-
SEA
37h 28m
1 stop
Austrian Airlines Logo
8:17 am - 6:40 am
SEA
-
LHR
14h 23m
1 stop
$499Austrian Airlines
Thu, Feb 5 - Mon, Feb 9
Icelandair Logo
12:15 pm - 5:00 pm
LHR
-
SEA
12h 45m
1 stop
Icelandair Logo
2:35 pm - 10:50 am
SEA
-
LHR
12h 15m
1 stop
$501Icelandair
Wed, Mar 11 - Wed, Mar 18
Multiple Airlines Logo
6:35 am - 2:20 pm
LHR
-
SEA
14h 45m
1 stop
Multiple Airlines Logo
7:00 am - 5:55 am
SEA
-
LHR
15h 55m
1 stop
$502Multiple Airlines
Thu, Mar 12 - Thu, Mar 19
Multiple Airlines Logo
6:30 am - 1:10 pm
LHR
-
SEA
13h 40m
1 stop
Multiple Airlines Logo
8:00 am - 6:40 am
SEA
-
LHR
15h 40m
1 stop
$503Multiple Airlines
Fri, Feb 6 - Tue, Feb 10
Lufthansa Logo
7:40 am - 1:20 pm
LHR
-
SEA
13h 40m
1 stop
Lufthansa Logo
7:00 am - 5:55 am
SEA
-
LHR
14h 55m
1 stop
$504Lufthansa
Wed, Feb 11 - Wed, Feb 18
United Airlines Logo
6:35 am - 1:20 pm
LHR
-
SEA
14h 45m
1 stop
United Airlines Logo
11:35 pm - 9:20 pm
SEA
-
LHR
13h 45m
1 stop
$505United Airlines
Booking Insights

KAYAK's insights & trends for Heathrow to Seattle flights

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

What’s the cheapest day of the week to fly from London Heathrow Airport to Seattle?

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

If your flying dates are flexible, you should consider flying to Seattle on a Wednesday, as we generally find the cheapest rates on that day for this route. On the other hand, Sunday is the most expensive day to fly from London Heathrow Airport to Seattle. For your return ticket, we recommend flying on a Wednesday and avoiding Fridays for the best deals.

What is the cheapest month to fly from London Heathrow Airport to Seattle?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from London Heathrow Airport to Seattle, 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 Heathrow Airport to Seattle is February, where tickets cost $609 (return) on average. On the other hand, the most expensive months are July and December, where the average cost of round-trip tickets is $941 and $882 respectively.

Can I save money by flying with a layover from London Heathrow Airport to Seattle?

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 1 stop layover the cheapest option at $770 on average.

How far in advance should I book a flight from London Heathrow Airport to Seattle?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from London Heathrow Airport to Seattle, 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 Heathrow Airport to Seattle, 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 9 weeks before departure.

Expert advice

Expert advice for your flight from Heathrow to Seattle

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Marisa Garcia

Marisa Garcia

Expert on Iberia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Duncan Madden

Duncan Madden

Expert on British Airways and LHR

Duncan is a freelance travel writer, copywriter and book author in constant search of travel stories and the perpetual sensation of being on holiday. He’s never happier than when on a dusty trail in search of empty waves or ducking under the piste tape in search of snowbound solitude. British born, living in Germany, but happiest heading for the horizon. His first book, Found in Translation, explores the etymologies and stories of country names around the world and is out now.

Stefanie Waldek

Stefanie Waldek

Expert on Delta

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Laura Ratliff

Laura Ratliff

Expert on Virgin Atlantic

Laura Ratliff is a New York-based writer and editor. She lives in downtown Brooklyn with her husband and their beloved dogs. Originally from Texas, she now considers New York City her home. She typically spends more than 200,000 miles on a plane each year and stays in plenty of hotels.

Harriet Baskas

Harriet Baskas

Expert on American Airlines and SEA

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Good to know

Low seasonJanuary
Cheapest flight$477
Best time to beat the crowds with an average 10% drop in price.
Most popular time to fly with an average 15% increase in price.
Flight from London Heathrow Airport to Seattle

When to book flights from Heathrow to Seattle

Are your dates flexible? Find out the best times to travel from Heathrow to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking London Heathrow Airport to Seattle flights

  • What is the cheapest flight from London Heathrow Airport to Seattle?

    In the last 3 days, the lowest price for a flight from London Heathrow Airport to Seattle was $477 for a one-way ticket and $482 for a round-trip.

  • Do I need a passport to fly between London Heathrow Airport and Seattle?

    Yes

  • Which airports will I be using when flying from London Heathrow Airport to Seattle?

    When flying out of London Heathrow Airport you will be using London Heathrow. You will be landing at Seattle, also known as Seattle/Tacoma Intl.

  • Which airlines offer Wi-Fi service onboard planes from London Heathrow Airport to Seattle?

    Air France, Delta, KLM, and Virgin Atlantic offer inflight Wi-Fi service on the London Heathrow Airport to Seattle flight route.

  • Which aircraft models fly most regularly from London Heathrow Airport to Seattle?

    The Boeing 787-9 Dreamliner is the aircraft model that flies most regularly on the London Heathrow Airport to Seattle flight route.

  • Which airline alliances offer flights from London Heathrow Airport to Seattle?

    SkyTeam, and oneworld are the airline alliances operating flights between London Heathrow Airport and Seattle, with SkyTeam being the most commonly used for this route.

  • On which days can I fly direct from London Heathrow Airport to Seattle?

    There are nonstop flights from London Heathrow Airport to Seattle on a daily basis.

  • Which is the best airline for flights from London to Seattle, Delta or Virgin Atlantic?

    The two airlines most popular with KAYAK users for flights from London to Seattle are Delta and Virgin Atlantic. With an average price for the route of $863 and an overall rating of 7.9, Delta is the most popular choice. Virgin Atlantic is also a great choice for the route, with an average price of $801 and an overall rating of 7.5.

  • How does KAYAK find such low prices on flights from London Heathrow Airport to Seattle?

    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 Heathrow Airport to Seattle.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from London Heathrow Airport 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 Heathrow Airport to Seattle?

    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 to Seattle with an airline and back to London Heathrow Airport with another airline. Booking your flights between London Heathrow Airport and SEA can sometimes prove cheaper using this method.

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

    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 to Seattle from London Heathrow Airport up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from London Heathrow Airport to Seattle

  • Looking for a cheap flight? 25% of our users found flights on this route for $609 or less one-way and $593 or less round-trip.

Prefer to fly direct from London Heathrow Airport to Seattle?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from London Heathrow to Seattle/Tacoma Intl.
Find which airlines fly direct from London Heathrow Airport to Seattle/Tacoma Intl Airport, which days they fly and book direct flights.

Direct departures

London Heathrow to Seattle/Tacoma Intl

Monday

British Airways, Delta, Virgin Atlantic

British Airways, Delta, +1 more

Tuesday

British Airways, Delta, Virgin Atlantic

British Airways, Delta, +1 more

Wednesday

British Airways, Delta, Virgin Atlantic

British Airways, Delta, +1 more

Thursday

British Airways, Delta, Virgin Atlantic

British Airways, Delta, +1 more

Friday

British Airways, Delta, Virgin Atlantic

British Airways, Delta, +1 more

Saturday

British Airways, Delta, Virgin Atlantic

British Airways, Delta, +1 more

Sunday

British Airways, Delta, Virgin Atlantic

British Airways, Delta, +1 more

See more direct flights

Direct returns

Seattle/Tacoma Intl to London Heathrow

Monday

British Airways, Delta, Virgin Atlantic

British Airways, Delta, +1 more

Tuesday

British Airways, Delta, Virgin Atlantic

British Airways, Delta, +1 more

Wednesday

British Airways, Delta, Virgin Atlantic

British Airways, Delta, +1 more

Thursday

British Airways, Delta, Virgin Atlantic

British Airways, Delta, +1 more

Friday

British Airways, Delta, Virgin Atlantic

British Airways, Delta, +1 more

Saturday

British Airways, Delta, Virgin Atlantic

British Airways, Delta, +1 more

Sunday

British Airways, Delta, Virgin Atlantic

British Airways, Delta, +1 more

See more direct flights

Reviews of the top 4 airlines serving from Heathrow to Seattle

 
See real verified KAYAK customer reviews for airlines flying from London to Seattle. 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 Heathrow to Seattle? 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 8121 reviews
8.1Boarding
7.9Comfort
8.5Crew
7.2Food
7.8Entertainment
Airline reviews

The service from the flight attendants were of supreme quality. They greeted and treated everyone with a wide smile. This is totally absent nowadays. Kudos to them!!!!

10.0 ExcellentSenthil Kumar, Jan 2026
PDX - ATL
Read more Delta reviews

The service from the flight attendants were of supreme quality. They greeted and treated everyone with a wide smile. This is totally absent nowadays. Kudos to them!!!!

Excellent flight and got us around tough weather. Only issue was seat TV did not work and crew tried to reboot.

Very large passenger too space from my own seat. Arm board couldn’t be lowered because of his size. It wads very uncomfortable trip, as the flight was full couldn’t move anywhere having back pain because of the position in which I was the entire flight.

was sitting in the jet bridge for 10 minutes in -20 degree weather waiting for my bag

Very convenient considering that is a non-stop flight, but the Aeromexico still has old model planes, so the entertainment was very poor and the space for carry-on luggage was very limited.

Flight taking off must have been behind, because there was no pre-departure drink for first class like normal. Also, person in front of mine’s seat got stuck in the as far back as it normally goes position for the whole flight even during landing, flight attendant unable to fix it. Gate was not empty when we arrived, but that is MSP’s fault since was overdue for push back, not Delta’s, so had to sit on tarmac for a while and international flight so then still had to go through customs. Flight crew was excellent throughout though!

Flight from MEX to ATL had to divert to Tampa. When we got off the plane, there were non directions on what to do. Nearly 30 minutes just standing around. Finally told to go through security with no boarding passes, and turned away. Then told to to go back. Took forever to leave Tampa for ATL. Missed my connection to Harrisburg.

This long-haul international flight was the most comfortable among any of the same kind of flight operated by an American-headquartered airline - second to none!

Staff was great! Kind and cordial! Middle seat row 28 seat B has a hump in it. Trays were getting stuck when putting down and up. Good flight

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

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.

The flight attendant use 1.5 hours to answer my call. My dirty food tray was unattended.

The flight was completely full. Crew was not happy. Everyone was rude and brusque. Travelling with an arm in a cast and seating in the first row of economy cabin (in front of the separation) I needed help retrieving my tray for the meal. A staff member literally threw the tray on my lap, without helping to take out the tray. Boarding was messy, with 300 people waiting in an encloses space with low ceiling. I will try to avoid AA next time I have a long flight.

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

My touch screen at my seat wasn't working, the films BA advertised on the website for this flight were not available, and the plane was a little dated, food was good and the staff were good, just let down by the aircraft facilities.

Did not like the seating configuration at all with 2+3+2 in business class. Lacking total privacy and comfort

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.

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.

Everything you need to know for your flight from Heathrow to Seattle

Information on your arrival and departure airports