S$741 Cheap Flights from London to Seattle

View S$741 flight on Mon, 29 Dec, 2025Opens in a new window

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

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Cheap Flights from London to Seattle (LHR-SEA)

Prices were available within the past 7 days and start at S$741 for one-way flights and S$981 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Lufthansa
Fri, 14 Nov - Sun, 23 Nov
LHR
London
SEA
Seattle
S$981 Return, found 1 day ago
S$981
Return
found 1 day ago
Select Lufthansa flight, departing Fri, 14 Nov from London to Seattle, returning Sun, 23 Nov, priced at S$981 found 1 day ago
United
Fri, 14 Nov - Sun, 23 Nov
LHR
London
SEA
Seattle
S$985 Return, found 1 day ago
S$985
Return
found 1 day ago
Select United flight, departing Fri, 14 Nov from London to Seattle, returning Sun, 23 Nov, priced at S$985 found 1 day ago
United
Thu, 6 Nov - Wed, 19 Nov
LHR
London
SEA
Seattle
S$993 Return, found 1 day ago
S$993
Return
found 1 day ago
Select United flight, departing Thu, 6 Nov from London to Seattle, returning Wed, 19 Nov, priced at S$993 found 1 day ago
United
Thu, 6 Nov - Wed, 19 Nov
LHR
London
SEA
Seattle
S$993 Return, found 1 day ago
S$993
Return
found 1 day ago
Select United flight, departing Thu, 6 Nov from London to Seattle, returning Wed, 19 Nov, priced at S$993 found 1 day ago
Air Canada
Thu, 6 Nov - Wed, 19 Nov
LHR
London
SEA
Seattle
S$994 Return, found 1 day ago
S$994
Return
found 1 day ago
Select Air Canada flight, departing Thu, 6 Nov from London to Seattle, returning Wed, 19 Nov, priced at S$994 found 1 day ago
KLM
Thu, 6 Nov - Wed, 19 Nov
LHR
London
SEA
Seattle
S$999 Return, found 1 day ago
S$999
Return
found 1 day ago
Select KLM flight, departing Thu, 6 Nov from London to Seattle, returning Wed, 19 Nov, priced at S$999 found 1 day ago
Air Canada
Thu, 6 Nov - Wed, 19 Nov
LHR
London
SEA
Seattle
S$1,002 Return, found 1 day ago
S$1,002
Return
found 1 day ago
Select Air Canada flight, departing Thu, 6 Nov from London to Seattle, returning Wed, 19 Nov, priced at S$1,002 found 1 day ago
Lufthansa
Thu, 6 Nov - Wed, 19 Nov
LHR
London
SEA
Seattle
S$1,010 Return, found 1 day ago
S$1,010
Return
found 1 day ago
Select Lufthansa flight, departing Thu, 6 Nov from London to Seattle, returning Wed, 19 Nov, priced at S$1,010 found 1 day ago
KLM
Thu, 6 Nov - Wed, 19 Nov
LHR
London
SEA
Seattle
S$1,021 Return, found 1 day ago
S$1,021
Return
found 1 day ago
Select KLM flight, departing Thu, 6 Nov from London to Seattle, returning Wed, 19 Nov, priced at S$1,021 found 1 day ago
American Airlines
Fri, 14 Nov - Sun, 23 Nov
LHR
London
SEA
Seattle
S$1,030 Return, found 1 day ago
S$1,030
Return
found 1 day ago
Select American Airlines flight, departing Fri, 14 Nov from London to Seattle, returning Sun, 23 Nov, priced at S$1,030 found 1 day ago

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

February is typically the cheapest month to fly

From S$627 - S$1,244 per traveller.

Frequently asked questions

How much is a flight from Heathrow Airport to Sea-Tac Airport?
Start packing your bags, because round-trip journeys from LHR to Seattle - Tacoma Intl. Airport (SEA) start from S$981. That's based on airfares listed within the last 7 days on Expedia for flights departing within the next year. Prices can change quickly, so book now to secure the best deal. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Heathrow Airport (LHR) to Sea-Tac Airport?
Most flights can be cancelled online, but whether you incur a fee depends on your airline. If you do have to cancel your trip, follow the instructions in the Customer Service Portal.
How do I find cheap flights from Heathrow Airport to SEA 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 London Heathrow to Sea-Tac Airport flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Heathrow Airport (LHR) to Seattle - Tacoma Intl. Airport (SEA)?
With around 7,700 kilometres separating LHR and Seattle - Tacoma Intl. Airport (SEA), your flight will be a long one. Pack wisely to make your time on board more comfortable. Little things like an extra pair of socks and a good neck pillow can make a big difference.
Which airlines fly direct from Heathrow Airport to Sea-Tac Airport?
Getting from London Heathrow to Sea-Tac Airport is easy when you have a good range of airlines to choose from. Here are a few of the best:

  • 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 Heathrow Airport to Sea-Tac Airport flight tickets cheaper when they're purchased at the last minute?
Late planners can sometimes score a bargain, with some of the cheapest airfares from London Heathrow to SEA surfacing a few weeks before the departure date. If you'd rather book ahead, Expedia compares and updates all the best flight deals continuously — as early as a year in advance in some cases. It depends on the carrier though, as not all airlines advertise prices that far in advance.

Travel information

Travel information

Origin airport
Heathrow
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Delta, Finnair, Iberia, KLM, Lufthansa, Singapore Airlines, Turkish Airlines, United, WestJet
Return price
S$981
Distance
7657 km
Average flight time
2 hours 1 min

Book with confidence

Book with confidence

Perfect flights from London to Seattle

Your Journey from London to Seattle

Start your unforgettable journey with Expedia. Our broad selection of flights from London to Seattle 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 American Airlines, Finnair, British Airways, Iberia, Lufthansa, United, Air Canada, KLM, WestJet. Our selection of flights from Heathrow to Seattle - Tacoma Intl. 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 London to Seattle Flights

Experience the joy of finding cheap flights from Heathrow to Seattle - Tacoma Intl. that fit your budget. Keep an eye out for our special deals and discounts, and check our flexible one-way fares from S$741 and roundtrip prices from S$981*.
 

Pre-Flight Essentials

Ensure a smooth journey from London to Seattle 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 Seattle

Picture yourself stepping off the plane in Seattle and immersing yourself in the unique atmosphere of Seattle. 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 London to Seattle 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 London to Seattle.
 

Beyond the Flight – Exploring Seattle

With Expedia, your adventure extends beyond the flight. Explore Seattle 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 London to Seattle 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 London to Seattle with confidence. Book your travel arrangements with Expedia today.
 
*Note: Prices may vary based on availability and are subject to change.
Perfect flights from London to Seattle

Explore a world of travel with Expedia

Explore a world of travel with Expedia

London Airports

London

Gatwick to Seattle
S$982.00
*Available to Expedia members.