LHR - SEA

$336 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 9/4. 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

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

Mon, Nov 10 - Sun, Nov 16
Lufthansa Logo
6:30 am - 12:10 pmLHR-SEA
13h 40m1 stop
Lufthansa Logo
3:10 pm - 1:00 pmSEA-LHR
13h 50m1 stop
$522Lufthansa
Find Deal
Thu, Oct 2 - Thu, Oct 16
Icelandair Logo
1:05 pm - 8:40 pmLHR-SEA
15h 35m1 stop
Icelandair Logo
7:00 pm - 11:55 amSEA-LHR
32h 55m1 stop
$541Icelandair
Find Deal
Wed, Sep 10 - Wed, Sep 17
Virgin Atlantic Logo
6:15 am - 11:15 amLHR-SEA
13h 00m1 stop
Virgin Atlantic Logo
5:35 pm - 11:20 amSEA-LHR
9h 45mnonstop
$604Virgin Atlantic
Find Deal
Wed, Sep 10 - Wed, Sep 17
Virgin Atlantic Logo
6:15 am - 11:15 amLHR-SEA
13h 00m1 stop
Virgin Atlantic Logo
8:25 pm - 2:15 pmSEA-LHR
9h 50mnonstop
$608Virgin Atlantic
Find Deal
Tue, Sep 2 - Tue, Sep 9
Delta Logo
9:55 am - 4:05 pmLHR-SEA
14h 10m1 stop
Delta Logo
8:25 pm - 2:15 pmSEA-LHR
9h 50mnonstop
$620Delta
Find Deal
Wed, Sep 3 - Wed, Sep 17
Delta Logo
6:30 am - 11:45 amLHR-SEA
13h 15m1 stop
Delta Logo
5:35 pm - 11:20 amSEA-LHR
9h 45mnonstop
$626Delta
Find Deal
Wed, Sep 10 - Sun, Sep 14
British Airways Logo
4:30 pm - 6:20 pmLHR-SEA
9h 50mnonstop
British Airways Logo
8:20 pm - 1:40 pmSEA-LHR
9h 20mnonstop
$648British Airways
Find Deal
Wed, Jul 9 - Mon, Jul 21
American Airlines Logo
4:25 pm - 12:43 amLHR-SEA
16h 18m1 stop
American Airlines Logo
5:40 pm - 3:10 pmSEA-LHR
13h 30m1 stop
$667American Airlines
Find Deal
Wed, Jul 9 - Mon, Jul 21
American Airlines Logo
3:00 pm - 10:55 pmLHR-SEA
15h 55m1 stop
American Airlines Logo
8:20 pm - 1:40 pmSEA-LHR
9h 20mnonstop
$698American Airlines
Find Deal
Tue, Jul 15 - Tue, Jul 22
British Airways Logo
10:05 am - 9:43 pmLHR-SEA
19h 38m1 stop
British Airways Logo
1:30 pm - 6:50 amSEA-LHR
9h 20mnonstop
$699British Airways
Find Deal
Expert advice

Expert advice for your flight from Heathrow to Seattle

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
Delta

Delta One Suites offer privacy with sliding doors, ideal for long-haul comfort.


Delta's Premium Select offers 38 inches of pitch and memory foam pillows.

Read more about Deltaby Stefanie Waldek
British Airways

Upgrade to premium economy for more space, priority boarding, and a bigger baggage allowance.


BA's premium economy offers seven extra inches of legroom, ideal for taller travelers.

Virgin Atlantic

Virgin's Upper Class offers fully flat beds and exclusive lounge access.


Virgin's Economy Delight includes extra legroom and priority boarding.

American Airlines

AA's Main Cabin Extra offers early boarding and complimentary drinks.


AA's Premium Economy includes upgraded seats and complimentary meals.

Iberia

Iberia's business class offers all-aisle access and Wi-Fi for connectivity.


Iberia's Premium Economy offers 37-inch seat pitch and USB power outlets.

Read more about Iberiaby Marisa Garcia
Airports
LHR

Heathrow can be overcrowded. Arrive two hours early for carry-on and longer if checking bags. Avoid peak times for a smoother experience.

Read more about LHRby Duncan Madden
SEA

Use the Link light rail for a cost-effective 40-minute trip from SEA to downtown Seattle, avoiding high ride-hailing fares.

Read more about SEAby Harriet Baskas
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on Delta

Stefanie Waldek

Stefanie Waldek

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.

Read more
Duncan Madden

Duncan Madden

Expert on British Airways and LHR

Duncan Madden

Duncan Madden

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.

Read more
Laura Ratliff

Laura Ratliff

Expert on Virgin Atlantic

Laura Ratliff

Laura Ratliff

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.

Read more
Harriet Baskas

Harriet Baskas

Expert on American Airlines and SEA

Harriet Baskas

Harriet Baskas

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.

Read more
Marisa Garcia

Marisa Garcia

Expert on Iberia

Marisa Garcia

Marisa Garcia

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.

Read more
Useful Info

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, Friday is the most expensive day to fly from London Heathrow Airport to Seattle. For your return ticket, we recommend flying on a Tuesday and avoiding Saturdays 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 $655 (return) on average. On the other hand, the most expensive months are July and August, where the average cost of round-trip tickets is $1,014 and $943 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 $1,680 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 4 weeks before departure. For the absolute cheapest price, our data suggests you should book 24 weeks before departure.

Good to know

Low seasonJanuary
High seasonAugust
Cheapest flight$336
Best time to beat the crowds with an average 10% drop in price.
Most popular time to fly with an average 20% 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 $336 for a one-way ticket and $522 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?

    KLM, Air France, Virgin Atlantic, and Delta 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 Airbus A330-900neo 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?

    oneworld, and SkyTeam 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 $883 and an overall rating of 8.0, Delta is the most popular choice. Virgin Atlantic is also a great choice for the route, with an average price of $953 and an overall rating of 7.4.

  • 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 $617 or less one-way and $665 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

Aer Lingus, Aeromexico, Air France, +9 more

Aer Lingus, Aeromexico, +10 more

Tuesday

Aer Lingus, Aeromexico, Air France, +9 more

Aer Lingus, Aeromexico, +10 more

Wednesday

Aer Lingus, Aeromexico, Air France, +9 more

Aer Lingus, Aeromexico, +10 more

Thursday

Aer Lingus, Aeromexico, Air France, +9 more

Aer Lingus, Aeromexico, +10 more

Friday

Aer Lingus, Aeromexico, Air France, +9 more

Aer Lingus, Aeromexico, +10 more

Saturday

Aer Lingus, Aeromexico, Air France, +9 more

Aer Lingus, Aeromexico, +10 more

Sunday

Aer Lingus, Aeromexico, Air France, +9 more

Aer Lingus, Aeromexico, +10 more

See more direct flights

Direct returns

Seattle/Tacoma Intl to London Heathrow

Monday

Aer Lingus, Aeromexico, Air France, +9 more

Aer Lingus, Aeromexico, +10 more

Tuesday

Aer Lingus, Aeromexico, Air France, +9 more

Aer Lingus, Aeromexico, +10 more

Wednesday

Aer Lingus, Aeromexico, Air France, +9 more

Aer Lingus, Aeromexico, +10 more

Thursday

Aer Lingus, Aeromexico, Air France, +9 more

Aer Lingus, Aeromexico, +10 more

Friday

Aer Lingus, Aeromexico, Air France, +9 more

Aer Lingus, Aeromexico, +10 more

Saturday

Aer Lingus, Aeromexico, Air France, +9 more

Aer Lingus, Aeromexico, +10 more

Sunday

Aer Lingus, Aeromexico, Air France, +9 more

Aer Lingus, Aeromexico, +10 more

See more direct flights

Reviews of the top 5 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.
8.0
DeltaOverall score based on 7963 reviews
8.2Boarding
7.3Food
8.5Crew
7.9Entertainment
7.9Comfort
Airline reviews

I like for how they process during check in. It was very smoothly.

10.0 ExcellentAbdulla, Jun 2025CMH - JFK
Read more Delta reviews

I like for how they process during check in. It was very smoothly.

The flight was scheduled for 2:30 PM. Early in the morning we got a text message saying the flight was delayed and rescheduled for 3:00 PM. We got to the airport with that in mind. Then we got a message during check-in at the flight was rescheduled again for 2:30 PM. We almost missed our flight. In fact, our bags Were told that they would not make it. At the end, everything worked out. But it is very stressful.

Most aspects were good however if they assign boarding zones they ought to enforce them or why bother? My luggage from SAN-JFK-MAD was lost in NY so I without my main bag for two days upon arrival in Spain. They were helpful in tracking it and eventually delivered it to my hotel. The flub was because of a delay upon arrival in NYC. I had booked 2 1/2 hours between flights but we had to hold on the taxiway for an hour after landing while waiting for a clear gate which likely caused the baggage error.

Excellent check-in. Crew was good. Excellent communication from flight deck.

Great overall. There was a bit of turbulence so they could only serve water because too much turbulence for the carts. Was glad they prioritized safety though

Excellent flight, the planes were newer, they did a nice job with boarding, great service overall.

Great service. Flight was delayed while we sat on the runway for a couple of hours. Weather related. Staff made is very bearable. The steward servicing the first class cabin was exceptional. Thank you! 💗

5 hours of delay that could've been much shorter if Delta had taken the 1 hour delay they imposed on the flight before boarding to run any of the plane checks required for flight to find the hydraulic issue that required nearly 3 hours to fix. $24 of meal credit buys a sandwich and a soft drink. Poor communication within the terminal about what gate we'd be re-boarding from and when we'd be re-boarding.

Amazing flight! I have never noticed the uniforms of the attendants before in twenty years of flying except today when one female had the most amazing dress on. It was beautifully designed and showed she was in charge. I never dreamed I would google who designed Delta uniforms . The ultimate compliment is when another woman admires your outfit. . I hope your designer puts it on the market

It would be nice if was given wires ear buds. Overall was a good experience was able to sleep on the plane

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

Your flight delayed at Heathrow n I almost missed my mother funeral.you idiots. I had to waste 10 hours in different airports. Thank your stars I'm not suing you.

Miami airport needs more thorough signage. It was a long walk from my transport point to the check in desk,

Flight took off an hour late. Had to stay on the tarmac for half an hour after landing. Both annoying.

We had an unfortunate experience where we had to leave the aircraft after boarding, shortly before the scheduled takeoff time, and re-board. The reason given was that a passenger felt ill and had to cancel their plans and therefor their luggage had to be found and removed.

We’ve used VA before many times the experience is always been good they have lovely staff and the food is always delicious.

They cancelled my flight and downgraded me to economy and only gave me $250 for the downgrade

Loved the staff, boarding and drink options! Wish the comfort of the seat could have been better nevertheless

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.

The chair cushions may need an upgrade. I have been noticing they are so worn out, thin so you’d sit in a dip 😄. Other than that, all was an enjoyable trip. Thanks AA!

I’m impressed that we were on time in Sacramento after having a late departure in Newark and our made it. The staff was friendly and warm.

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!

Staff lovely , economy seats very uncomfortable , wheelchair assistance wonderful in Heathrow awful in Nashville !

It was a code share with Alaska - would have been great if I actually made it on the plane, claimed I didn’t have a ticket or a seat even thought I was checked in.

Good crew and a great experience. Only good things to say.

Great thanks - a whole row to myself. Good food but film selection not great.

Comfort of seats is not good. Like sitting on a rock for 6 hours. Also no in flight food and limited beverages unless you pay is not nice. Need flight to be dark during the “night” but attendants don’t ask for shades to be lowered..

Seats in premier saga class were narrow and hard. Very uncomfortable for a 5-hour flight.

Iceland airlines doesn't provide any meal on flight to and from New York, except water and soda. Airline over charge for checking in luggage. I'm really upset.

Iceland airlines doesn't provide any meal on flight to and from New York, except water and soda. Airline over charge for checking in luggage. I'm really upset. If there is option to use another company, I suggest to other people use them.

I had an exit row and so was Comfortable on the long flight.

The seats on this airline are sooo small, even for a petite person. I felt like the seat tilted forward and I was fighting to stay in it. The lavatory is horribly small, with a wet floor because the sink is so small you can't help but splash the water all over when washing up.

For an economy lite experience, it's by far the best I've had. New planes, clean, great destinations. Very happy to have discovered Iceland Air.

Smooth efficient airline. Think they should have their own bag drop as the queue took 30mins to bmscan and drop

Good. Lacking overhead bin space. No food offered but you can order online or in flight and pay for snacks.

No food was served for 7.5 hrs flight. When our flight changed to other airlines due to wether issue, our seats booked with no checked in luggage when I already payed for. We end up to pay 90 euro per suitcase.

Better synchronizing the boarding processes. The audio announcements, the personnel and the digital signage were not saying the same thing. All confusion.

The first class seats were unusable, mine at the end of the flight, my husband's in the middle of the flight, and the one next to me was unusable either, they had to move the person to another seat.

Last minute gate change. Didn’t put our TSA global on our trip even though we asked multiple times to confirm. Did not help with food when could not eat what was served.

The cabin was bit colder than I like but the crew members looked after us very well. They did even offer hot water bottle and hot chocolate. I cannot rate the crew enough excellent is not good enough. They really were wonderful.

Boarding is always a challenge as folks in al groups crowd around for no reason, but crew handled it well. I once again applaud the LHR ground baggage staff as they got our bags from a flight at Terminal 5A to a flight in Terminal 5C within 40 minutes...amazing!

This flight from London to Chicago was actually on an AA airline. I did book through BA but the flight was AA. Great flight, hectic in Chicago, I wouldn't choose to fly through Chicago again, but that's not the airlines fault. The flight itself was great.

Push back is not working when I complaint a male staff he told me that most of the seats are like that so we can’t do anything

Seats were way too small. I got claustrophobic waiting for trash from meal to be taken away. I couldn't move to even close my tray until trash was taken.

Boarding was fairly chaotic. One of your employees clipped my ankle as he was passing with an empty wheelchair and not only did not apologize but stated something to the effect of “oh forGod’s sake.” There was plenty of room for him to pass. otherwise, everything was excellent.

Fantastic! Great seats! Friendly staff! Amazing selection of shows and movies! Smooth ride! I don’t know what more I could have asked for honestly. They made flying a breeze this time around.

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

Information on your arrival and departure airports

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