RM1,461 Cheap Flights from Seattle (SEA) to London (LHR)

View RM1,461 flight on Thu, 11 Dec 2025Opens 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 RM1,461 for one-way flights and RM2,410 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

KLM
Sun, 3 Aug - Tue, 19 Aug
SEA
Seattle
LHR
London
RM2,410 Return, found 1 day ago
RM2,410
Return
found 1 day ago
Select KLM flight, departing Sun, 3 Aug from Seattle to London, returning Tue, 19 Aug, priced at RM2,410 found 1 day ago
Air France
Sun, 3 Aug - Tue, 19 Aug
SEA
Seattle
LHR
London
RM2,438 Return, found 1 day ago
RM2,438
Return
found 1 day ago
Select Air France flight, departing Sun, 3 Aug from Seattle to London, returning Tue, 19 Aug, priced at RM2,438 found 1 day ago
Air Canada
Thu, 11 Dec - Sat, 10 Jan
SEA
Seattle
LHR
London
RM2,644 Return, found 11 hours ago
RM2,644
Return
found 11 hours ago
Select Air Canada flight, departing Thu, 11 Dec from Seattle to London, returning Sat, 10 Jan, priced at RM2,644 found 11 hours ago
Air Canada
Thu, 11 Dec - Sat, 10 Jan
SEA
Seattle
LHR
London
RM2,673 Return, found 11 hours ago
RM2,673
Return
found 11 hours ago
Select Air Canada flight, departing Thu, 11 Dec from Seattle to London, returning Sat, 10 Jan, priced at RM2,673 found 11 hours ago
United
Thu, 11 Dec - Sat, 10 Jan
SEA
Seattle
LHR
London
RM2,726 Return, found 11 hours ago
RM2,726
Return
found 11 hours ago
Select United flight, departing Thu, 11 Dec from Seattle to London, returning Sat, 10 Jan, priced at RM2,726 found 11 hours ago
Lufthansa
Thu, 11 Dec - Sat, 10 Jan
SEA
Seattle
LHR
London
RM2,750 Return, found 11 hours ago
RM2,750
Return
found 11 hours ago
Select Lufthansa flight, departing Thu, 11 Dec from Seattle to London, returning Sat, 10 Jan, priced at RM2,750 found 11 hours ago
Air Canada
Thu, 11 Dec - Sat, 10 Jan
SEA
Seattle
LHR
London
RM2,755 Return, found 11 hours ago
RM2,755
Return
found 11 hours ago
Select Air Canada flight, departing Thu, 11 Dec from Seattle to London, returning Sat, 10 Jan, priced at RM2,755 found 11 hours ago
British Airways
Sun, 3 Aug - Tue, 19 Aug
SEA
Seattle
LHR
London
RM2,820 Return, found 1 day ago
RM2,820
Return
found 1 day ago
Select British Airways flight, departing Sun, 3 Aug from Seattle to London, returning Tue, 19 Aug, priced at RM2,820 found 1 day ago
Lufthansa
Thu, 11 Dec - Sat, 10 Jan
SEA
Seattle
LHR
London
RM2,832 Return, found 11 hours ago
RM2,832
Return
found 11 hours ago
Select Lufthansa flight, departing Thu, 11 Dec from Seattle to London, returning Sat, 10 Jan, priced at RM2,832 found 11 hours ago
United
Sun, 3 Aug - Tue, 19 Aug
SEA
Seattle
LHR
London
RM2,835 Return, found 1 day ago
RM2,835
Return
found 1 day ago
Select United flight, departing Sun, 3 Aug from Seattle to London, returning Tue, 19 Aug, priced at RM2,835 found 1 day ago

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

February is typically the cheapest month to fly

From RM 2,128 - RM 3,749 per traveller.

Graph displaying average flight prices per month

Seattle to London route information
Origin airport
Seattle - Tacoma Intl.
Destination airport
Heathrow
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, British Airways, Delta, Finnair, Iberia, KLM, Turkish Airlines, United, WestJet
Return price
RM2,410
Distance
7657 km
Average flight time
17 hours 33 mins

Perfect flights from Seattle to London

Your Journey from Seattle to London

Start your unforgettable journey with Expedia. Our broad selection of flights from Seattle to London caters to every travel need. Whether you're yearning for a romantic escape, a solo adventure, or a cultural immersion, we've got you covered.
 

Choosing Your Ideal Flight

With Expedia, you have access to a wide range of airlines, including WestJet, Air Canada, United, Delta, Lufthansa, KLM, Air France, British Airways. Our selection of flights from Seattle - Tacoma Intl. to Heathrow caters to every traveler's requirements, ensuring your journey aligns with your schedule. With options from 20 airlines, you're bound to find the perfect flight.
 

Maximizing Value with Seattle to London Flights

Experience the joy of finding cheap flights from Seattle - Tacoma Intl. to Heathrow that fit your budget. Keep an eye out for our special deals and discounts, and check our flexible one-way fares from RM1,461 and roundtrip prices from RM2,410*.
 

Pre-Flight Essentials

Ensure a smooth journey from Seattle to London with Expedia. From information about check-in times and in-flight amenities to guidance on baggage policies, we provide all the essentials to prepare you for your flight.
 

Experience the Vibrant London

Picture yourself stepping off the plane in London and immersing yourself in the unique atmosphere of . From local markets to cultural festivals, each city offers its distinct charm. Make the most of your trip by exploring local attractions and indulging in the local cuisine. With Expedia, explore all this and more, tailored to your budget.
 

Added Convenience on Your Seattle to London Flight

Traveling with Expedia is more than just a flight. We offer details about in-flight amenities, baggage policies, and more to ensure a smooth and hassle-free journey. Choose from our variety of airlines and embark on a memorable journey from Seattle to London.
 

Beyond the Flight – Exploring London

With Expedia, your adventure extends beyond the flight. Explore London at your own pace by renting a car or booking a hotel. Discover hidden gems off the beaten path and create unforgettable memories.
 

Book Your Flight from Seattle to London with Confidence

Planning your next great adventure is a breeze with Expedia. Our user-friendly platform, unbeatable prices, and round-the-clock customer support make your travel experience seamless and stress-free. Embark on your journey from Seattle to London with confidence. Book your travel arrangements with Expedia today.
 
*Note: Prices may vary based on availability and are subject to change.

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 RM2,410. 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.

Explore a world of travel with Expedia

*Available to Expedia members.