LHR - SEA

£234 Find Cheap Flights from London Heathrow Airport to Seattle

This is the cheapest return flight price found by a KAYAK user in the last 72 hours by searching for a flight from Heathrow to Seattle departing on 28/10. 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

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 return 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 return flight deals from Heathrow to Seattle

Tue, 28 Oct - Tue, 4 Nov
Austrian Airlines Logo
12:05 - 20:54LHR-SEA
15h 49m1 stop
Austrian Airlines Logo
08:00 - 06:40SEA-LHR
14h 40m1 stop
£234Austrian Airlines
Find Deal
Sat, 28 Jun - Tue, 15 Jul
 Logo
06:00 - 14:50LHR-SEA
16h 50m1 stop
 Logo
13:00 - 10:40SEA-LHR
13h 40m1 stop
Wed, 27 Aug - Tue, 9 Sep
KLM Logo
09:55 - 15:55LHR-SEA
14h 00m1 stop
KLM Logo
20:25 - 14:15SEA-LHR
9h 50mdirect
£433KLM
Find Deal
Tue, 9 Sep - Wed, 17 Sep
KLM Logo
09:55 - 16:05LHR-SEA
14h 10m1 stop
KLM Logo
20:25 - 14:15SEA-LHR
9h 50mdirect
£436KLM
Find Deal
Tue, 23 Sep - Tue, 7 Oct
Virgin Atlantic Logo
06:15 - 11:15LHR-SEA
13h 00m1 stop
Virgin Atlantic Logo
17:35 - 11:20SEA-LHR
9h 45mdirect
£439Virgin Atlantic
Find Deal
Tue, 28 Oct - Tue, 4 Nov
British Airways Logo
11:55 - 21:19LHR-SEA
16h 24m1 stop
British Airways Logo
11:51 - 10:00SEA-LHR
14h 09m1 stop
£444British Airways
Find Deal
Wed, 3 Sep - Wed, 17 Sep
Virgin Atlantic Logo
13:25 - 15:45LHR-SEA
10h 20mdirect
Virgin Atlantic Logo
17:35 - 11:20SEA-LHR
9h 45mdirect
£449Virgin Atlantic
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Wed, 20 Aug - Tue, 9 Sep
Icelandair Logo
13:05 - 17:50LHR-SEA
12h 45m1 stop
Icelandair Logo
15:45 - 11:55SEA-LHR
12h 10m1 stop
£464Icelandair
Find Deal
Sun, 22 Jun - Thu, 26 Jun
Icelandair Logo
21:25 - 11:25LHR-SEA
22h 00m1 stop
Icelandair Logo
23:30 - 11:55SEA-LHR
28h 25m1 stop
£470Icelandair
Find Deal
Thu, 28 Aug - Tue, 9 Sep
British Airways Logo
16:30 - 18:20LHR-SEA
9h 50mdirect
British Airways Logo
13:30 - 06:50SEA-LHR
9h 20mdirect
£477British 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 summarisation 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.
Airports
LHR

For a quick journey to central London, take the Heathrow Express to Paddington in just 15 minutes.

Read more about LHRby Kirstie Pickering
SEA

Use the Link light rail for an affordable 40-minute trip from SEA to downtown Seattle.

Read more about SEAby Harriet Baskas
Our travel experts
Kirstie Pickering

Kirstie Pickering

Expert on LHR

Kirstie Pickering

Kirstie Pickering

Aviation and business journalist Kirstie didn’t leave England until she was 18 years old, but has since travelled to over 20 countries including Japan, Canada, and Iceland. Her travel expertise lies in European city breaks, including how to find the best locally-owned hotels and restaurants and how to optimise the airport experience for your needs.

Read more
Harriet Baskas

Harriet Baskas

Expert on 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, 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
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.

Find cheap flights to Seattle
Find cheap flights to Seattle

Planning a trip from Heathrow to Seattle? KAYAK’s data-powered insights will help you find cheap flights. Learn the best time to fly, how early to book your ticket, and other tips to secure great prices.

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.

For London Heathrow Airport to Seattle, Tuesday is the cheapest day to fly on average and Sunday is the most expensive. Flying from Seattle back to London Heathrow Airport, the best deals are generally found on Tuesday, with Thursday being the most expensive.

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 £482 (return) on average. On the other hand, the most expensive months are July and August, where the average cost of round-trip tickets is £750 and £695 respectively.

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

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.

No, with an average price for the route of £1,699, prices are generally cheapest when you fly direct.

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 - Cheap tickets from London Heathrow Airport to Seattle

Low seasonJanuary
High seasonAugust
Cheapest flight£234
Best time to beat the crowds (10% less expensive on average)
Most popular time to fly (20% more expensive on average)
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 return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns 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

  • Are there hotels near Seattle Airport?

    Several hotels are located near Seattle Airport. The Wingate by Wyndham hotel has a free airport shuttle, fitness centre and free Wi-Fi. The Aloft Seattle Sea-Tac hotel is just down the street from the airport, offers laundry and dry cleaning services and is pet friendly. Another pet-friendly hotel is the Residence Inn which also offers free breakfast and an airport shuttle. The Residence Inn and the Element Hotel are two options that include kitchenettes and microwaves in their rooms.

  • How can I get to Heathrow Airport from central London?

    There is an express train that runs from London Paddington Station to Heathrow Airport around every 15min. The trip takes roughly 15min and tickets cost about £25.00. Children under 15 can travel for free as long as they are travelling with a fare-paying adult or have proof of their flight booking.

  • What's the best way to reach downtown Seattle from the airport?

    The 1 Line Light Rail service runs from the airport to downtown Seattle. The trip takes around 41min. The line also stops at the University of Washington. You can reach the Light Rail Station by heading across the 'Skybridge' from baggage claim. B uses from Seattle Airport depart from near the Light Rail Station. The Rapid Ride A-Line and Route 156 buses both travel to downtown Seattle. Your hotel may also offer a courtesy shuttle from the airport. These shuttles will stop at the courtesy island shuttle lane on the third floor of the car park.

  • Are there hotels at Heathrow Airport?

    There are three hotels connected to Heathrow Airport. The Sofitel Hotel is connected to Terminal 5 and offers a complimentary breakfast. If you're departing from Terminal 4, you might prefer to stay at The Hilton which has a fitness centre and restaurant on-site. The Aerotel hotel is connected to Terminal 3 and is within walking distance of Terminal 2. Aerotel offers hourly booking with a minimum stay of one hour.

  • 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 £324 for a one-way ticket and £318 for a return.

  • 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 direct flights from London Heathrow Airport to Seattle on a daily basis.

  • Which is the best airline for flights from London to Seattle, KLM or Finnair?

    The two airlines most popular with KAYAK users for flights from London to Seattle are KLM and Finnair. With an average price for the route of £567 and an overall rating of 7.8, KLM is the most popular choice. Finnair is also a great choice for the route, with an average price of £559 and an overall rating of 7.6.

  • 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 travellers 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 return ticket. You could then fly to Seattle with an airline and back to London Heathrow Airport with another airline.

  • 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 from Seattle to London Heathrow Airport? 25% of our users found flights on this route for £526 or less one-way and £499 or less round-trip.
  • Travelling with children at London Heathrow Airport (LHR)? Kids aged nine and under can visit Stay & Play areas available in each terminal. Open between 6:00 and 21:00, these are soft play areas that also offer colouring-in and activity sheets.
  • Seattle Tacoma Airport (SEA) has the FlySEA app which provides information and live updates on ground transport including public transport, taxis and courtesy shuttles. It also provides up-to-date information on flights, so anyone picking you up from the airport can check to see if your flight is delayed.
  • Heathrow Airport has partnered with the 'Grab' app to let you pre-order food and drink from your phone and collect it from one of the dedicated checkpoints in the terminal.
  • Heathrow Airport has multi-faith prayer rooms in each terminal, after security. You can also visit St. George's Chapel, located just outside the airport.
  • If you've organised for someone to pick you up from Seattle Airport, they can park in the Cell Phone Car Park for free for up to 20min. Let them know when you're ready to leave and they will be able to pick you up from outside Baggage Claim.

Prefer to fly direct from London Heathrow Airport to Seattle?

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
See more direct flights

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.
7.8
KLMOverall score based on 1358 reviews
8.4Crew
7.2Food
7.7Comfort
7.1Entertainment
7.8Boarding
Airline reviews

Legroom not all it could be, especially when the seat in front is reclined. Otherwise it was good, food and beverage were nice.

8.0 ExcellentAnonymous, Apr 2025AMS - INL
Read more KLM reviews

Legroom not all it could be, especially when the seat in front is reclined. Otherwise it was good, food and beverage were nice.

Transfer at Amsterdam airport is very convenient and the airport is easy to navigate. Boarding was also quick and easy. Cabin crew were excellent and the meals were good, although lacking in options.

Overall very positive. Boarding was quick and organized. Cabin was clean and seats were reasonably comfortable. Cabin crew was excellent and the meals provided were also of good quality

This fight left ahead of time which meant it arrived early which was great. Staff were very professional, but as with all these Short hop Flights the food was a disappointing snack There was no entertainment on this flight, but I did not expect any

I flew premium economy and this was a good option. Although the seats didn’t recline much, I was able to get some sleep with my head propped against the window. The food was good and the entertainment was wonderful The staff were very attentive and professional

They only had vegetarian food left on the flight which I wasn’t happy about. I didn’t get any food to eat at all.

Great boarding, great short flight but no entertainment whatsoever and no wifi. Prepare to disembark by a staircase.

Great boarding, great short flight but no entertainment whatsoever. It was supposed to have wifi but that did not work.

There was fog in Amsterdam so many flights were delayed because of the weather. Air France knew that the flight would be delayed by two hours but still boarded the plane on time. Instead of letting the passengers wait at the gate we were crammed into the plane. It was uncomfortable. No refreshments were given. I couldn’t charge my devices onboard.

Seats were comfortable crew members support was very good but AVML ordered or selected by us needs a lot of improvement.

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.

The only reason the overall rating wasn't "excellent" was due to problems in claiming luggage. The bags are delivered to the main area (Cinta 35) for domestic passengers, but to a DIFFERENT ROOM for international arrivees. After waiting 30 minutes, someone (who didn't appear to be from Air France or the airport) told us to go to another area. There we found our bags, which appeared to have been awaiting us for a while. We had to go through a bag check before leaving the airport. If we had been alerted to this possibility, or better yet, been to go directly to Cinta 34, we could have eliminated quite a bit of waiting.

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.

My wife and I had a row to ourselves after moving seats. There were no TVs and you had to buy food. So we did nothing but had a quick nap. Flight was fine.

The male attended that served are section was a snob. He did not answer my call light when my wine spilled all over the floor. I did not push it again or drew his attention to it. He just ignored the call light when he came to give us our meal, serving the people behind us first. I did not push it again or drew his attention to it to see his reaction. It was so obvious that he was ignoring us. We were in premium economy!

The plane was old Only 3 bathrooms available for economy The entertainment was old and the selection was poor

Georgian Airways check in staff initially denied us, because they thought passengers required transit visas to transfer on connecting flights. This required 70 minutes for them to call multiple people to confirm how transfers worked. They did not apologize once accepting our check in. Onboard, the four hour flight gave stale bread with spam slices as lunch. The only included drinks were still or sparkling water.

Not a good one this time. The absence of internet without any information/notification ahead was really the unacceptable part. Also this new A350-900 has a serious legroom challenge for economy seats. It’s more like a medium-haul flight legroom configuration.

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.

Everything about the flight was amazing from check in to boarding entertainment was okay food we didn’t try.

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.

The flights were in time and the bags arrived. well done

Booked with Kayak… Economy Class it said. I had filtered for 1 checked bag. Get to boarding and it says I have Economy Light w/ no checked bags. $136 each way for baggage now. Do not use smartfares.com. Very misleading and a terrible start to this trip.

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

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