S$816 Cheap Flights from London to Seattle

View S$816 flight on Tue, 19 Aug, 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$816 for one-way flights and S$1,006 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Thu, 10 Jul - Mon, 14 Jul
LHR
London
SEA
Seattle
S$1,006 Return, found 3 days ago
S$1,006
Return
found 3 days ago
Select Air Canada flight, departing Thu, 10 Jul from London to Seattle, returning Mon, 14 Jul, priced at S$1,006 found 3 days ago
Air Canada
Tue, 19 Aug - Tue, 9 Sep
LHR
London
SEA
Seattle
S$1,008 Return, found 10 hours ago
S$1,008
Return
found 10 hours ago
Select Air Canada flight, departing Tue, 19 Aug from London to Seattle, returning Tue, 9 Sep, priced at S$1,008 found 10 hours ago
United
Thu, 10 Jul - Mon, 14 Jul
LHR
London
SEA
Seattle
S$1,014 Return, found 3 days ago
S$1,014
Return
found 3 days ago
Select United flight, departing Thu, 10 Jul from London to Seattle, returning Mon, 14 Jul, priced at S$1,014 found 3 days ago
Air Canada
Thu, 10 Jul - Mon, 14 Jul
LHR
London
SEA
Seattle
S$1,015 Return, found 3 days ago
S$1,015
Return
found 3 days ago
Select Air Canada flight, departing Thu, 10 Jul from London to Seattle, returning Mon, 14 Jul, priced at S$1,015 found 3 days ago
United
Tue, 19 Aug - Tue, 9 Sep
LHR
London
SEA
Seattle
S$1,016 Return, found 10 hours ago
S$1,016
Return
found 10 hours ago
Select United flight, departing Tue, 19 Aug from London to Seattle, returning Tue, 9 Sep, priced at S$1,016 found 10 hours ago
Air Canada
Tue, 19 Aug - Tue, 9 Sep
LHR
London
SEA
Seattle
S$1,017 Return, found 10 hours ago
S$1,017
Return
found 10 hours ago
Select Air Canada flight, departing Tue, 19 Aug from London to Seattle, returning Tue, 9 Sep, priced at S$1,017 found 10 hours ago
Virgin Atlantic
Tue, 19 Aug - Tue, 9 Sep
LHR
London
SEA
Seattle
S$1,019 Return, found 10 hours ago
S$1,019
Return
found 10 hours ago
Select Virgin Atlantic flight, departing Tue, 19 Aug from London to Seattle, returning Tue, 9 Sep, priced at S$1,019 found 10 hours ago
Delta
Tue, 19 Aug - Tue, 9 Sep
LHR
London
SEA
Seattle
S$1,072 Return, found 10 hours ago
S$1,072
Return
found 10 hours ago
Select Delta flight, departing Tue, 19 Aug from London to Seattle, returning Tue, 9 Sep, priced at S$1,072 found 10 hours ago
Finnair
Thu, 10 Jul - Mon, 14 Jul
LHR
London
SEA
Seattle
S$1,104 Return, found 3 days ago
S$1,104
Return
found 3 days ago
Select Finnair flight, departing Thu, 10 Jul from London to Seattle, returning Mon, 14 Jul, priced at S$1,104 found 3 days ago
British Airways
Tue, 19 Aug - Tue, 9 Sep
LHR
London
SEA
Seattle
S$1,132 Return, found 10 hours ago
S$1,132
Return
found 10 hours ago
Select British Airways flight, departing Tue, 19 Aug from London to Seattle, returning Tue, 9 Sep, priced at S$1,132 found 10 hours ago
London to Seattle route information
Origin airport
Heathrow
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Delta, Finnair, Iberia, KLM, Lufthansa, United, Virgin Atlantic, WestJet
Return price
S$1,006
Distance
7657 km

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 WestJet, Air Canada, United, Virgin Atlantic, Delta, Finnair, British Airways, American Airlines, Iberia. 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$816 and roundtrip prices from S$1,006*.
 

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 . 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.

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$1,006. 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.

Explore a world of travel with Expedia

London Airports

London

Gatwick to Seattle
S$1,728.60
*Available to Expedia members.