€209 Cheap Flights Seattle to London (SEA-LHR)

View €209 flight on Tue, 3 Mar 2026Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Heathrow Airport (LHR)

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Cheap flights from Seattle to London (SEA-LHR)

Prices were available within the past 7 days and start at €209 for one-way flights and €467 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Icelandair
Fri, 27 Feb - Thu, 5 Mar
SEA
Seattle
LHR
London
€467 Return, found 6 days ago
€467
Return
found 6 days ago
Select Icelandair flight, departing Fri, 27 Feb from Seattle to London, returning Thu, 5 Mar, priced at €467 found 6 days ago
Icelandair
Tue, 3 Mar - Fri, 13 Mar
SEA
Seattle
LHR
London
€471 Return, found 2 days ago
€471
Return
found 2 days ago
Select Icelandair flight, departing Tue, 3 Mar from Seattle to London, returning Fri, 13 Mar, priced at €471 found 2 days ago
Aer Lingus
Fri, 6 Mar - Fri, 20 Mar
SEA
Seattle
LHR
London
€518 Return, found 2 days ago
€518
Return
found 2 days ago
Select Aer Lingus flight, departing Fri, 6 Mar from Seattle to London, returning Fri, 20 Mar, priced at €518 found 2 days ago
Lufthansa
Fri, 6 Mar - Fri, 20 Mar
SEA
Seattle
LHR
London
€532 Return, found 2 days ago
€532
Return
found 2 days ago
Select Lufthansa flight, departing Fri, 6 Mar from Seattle to London, returning Fri, 20 Mar, priced at €532 found 2 days ago
British Airways
Fri, 6 Mar - Fri, 20 Mar
SEA
Seattle
LHR
London
€548 Return, found 2 days ago
€548
Return
found 2 days ago
Select British Airways flight, departing Fri, 6 Mar from Seattle to London, returning Fri, 20 Mar, priced at €548 found 2 days ago
United
Sat, 7 Mar - Fri, 20 Mar
SEA
Seattle
LHR
London
€553 Return, found 1 day ago
€553
Return
found 1 day ago
Select United flight, departing Sat, 7 Mar from Seattle to London, returning Fri, 20 Mar, priced at €553 found 1 day ago
Virgin Atlantic
Mon, 16 Mar - Wed, 1 Apr
SEA
Seattle
LHR
London
€562 Return, found 1 hour ago
€562
Return
found 1 hour ago
Select Virgin Atlantic flight, departing Mon, 16 Mar from Seattle to London, returning Wed, 1 Apr, priced at €562 found 1 hour ago
Delta
Mon, 16 Mar - Wed, 1 Apr
SEA
Seattle
LHR
London
€562 Return, found 1 hour ago
€562
Return
found 1 hour ago
Select Delta flight, departing Mon, 16 Mar from Seattle to London, returning Wed, 1 Apr, priced at €562 found 1 hour ago
American Airlines
Mon, 16 Mar - Wed, 1 Apr
SEA
Seattle
LHR
London
€567 Return, found 1 hour ago
€567
Return
found 1 hour ago
Select American Airlines flight, departing Mon, 16 Mar from Seattle to London, returning Wed, 1 Apr, priced at €567 found 1 hour ago
Air Canada
Mon, 16 Mar - Wed, 1 Apr
SEA
Seattle
LHR
London
€576 Return, found 1 hour ago
€576
Return
found 1 hour ago
Select Air Canada flight, departing Mon, 16 Mar from Seattle to London, returning Wed, 1 Apr, priced at €576 found 1 hour ago

Find the cheapest month to fly from Seattle (SEA) to London (LHR)

October is typically the cheapest month to fly

From €413 - €729 per traveller.
Seattle to London route information
Origin airport
Seattle - Tacoma Intl.
Destination airport
Heathrow
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, KLM, United, Virgin Atlantic, WestJet
Return price
€466
Distance
7657 km
Average flight time
17 hours 32 mins

Perfect flights from Seattle to London

Embark on an unforgettable journey without breaking the bank with Expedia's incredible deals on cheap flights from Seattle to London. Whether you're aching for a romantic escape with your partner, craving an adventurous solo expedition, or yearning to immerse yourself in the local history and culture, we've got you covered.
 
Picture yourself strolling through the streets of , surrounded by breathtaking architecture and absorbing the vibrant atmosphere of this captivating city. Indulge in the mouth-watering local specialties, from tantalizing street food to exquisite fine dining. With Expedia, you can experience all of this and more, without sacrificing your budget.
 
Our flexible Seattle - Tacoma Intl. to Heathrow ticket options cater to your travel preferences, with incredible one-way fares from €209 and roundtrip prices from €467. Whether you're planning a short city break or a longer adventure, our dynamic pricing ensures that you find the best deals for your journey.
 
But the magic doesn't stop there. Expedia offers a range of partner services to enhance your trip. Rent a car at Heathrow and explore and its surrounding areas at your own pace. Discover hidden gems off the beaten path, and create unforgettable memories. We also provide a handpicked selection of accommodations, from charming bed and breakfasts to luxury hotels, ensuring that you have a comfortable and memorable stay.
 
Planning your next great adventure is a breeze with Expedia. Our user-friendly platform, unbeatable prices, and round-the-clock customer support are designed to make your travel experience seamless and stress-free. So, why wait? Book your to travel arrangements today and embark on the journey of a lifetime in London.

Frequently asked questions

How much is a flight from Sea-Tac Airport to Heathrow Airport (LHR)?
If you're travelling between SEA and London Heathrow, round-trip journeys start from €467. This price is based on fares listed within the last 7 days on Expedia for flights departing within the next year, so don't delay. Book today and save yourself money and time. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from SEA to Heathrow Airport?
The majority of flights can be cancelled online, but whether you are charged a fee all comes down to your airline. If you do need to cancel your trip, follow the instructions in the Customer Service Portal.
How do I find cheap flights from Seattle - Tacoma Intl. Airport (SEA) to LHR that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for Seattle - Tacoma Intl. Airport (SEA) to London Heathrow flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport?
With a flight distance of 7,700 kilometres between Sea-Tac Airport and Heathrow Airport (LHR), this is a long trip. Be sure to drink plenty of water and go for a short walk down the aisle every now and then.
Which airlines fly direct from SEA to Heathrow Airport (LHR)?
It's easy to fly directly from Sea-Tac Airport to Heathrow Airport. Below are the most sought-after carriers that offer nonstop services on this route:

  • Virgin Atlantic - (VS) with 30 monthly flights
  • American Airlines - (AA) with 30 monthly flights
  • British Airways - (BA) with 30 monthly flights
  • Delta Air Lines - (DL) with 17 monthly flights

Are SEA to LHR flight tickets cheaper when they're purchased at the last minute?
Flight prices are constantly going up and down, so there are no guarantees. While last-minute deals between Seattle - Tacoma Intl. Airport (SEA) and Heathrow Airport are of course possible, it's also a good idea to keep track of prices well before you fly. In fact, some airlines announce their prices up to a year prior to the departure date. Expedia is constantly updating the best bargains around, so keep checking back and be ready to lock in your seat when the price dips.

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