NZ$579 Cheap Flights Seattle to London (SEA-LON)

View NZ$579 flight on Thu, 23 Oct. 2025Opens in a new window

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

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Cheap Flights from Seattle (SEA) to London (LON)

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sun, 24 Aug. - Fri, 5 Sep.
SEA
Seattle
LHR
London
NZ$854 Return, found 6 days ago
NZ$854
Return
found 6 days ago
Select Delta flight, departing Sun, 24 Aug. from Seattle to London, returning Fri, 5 Sep., priced at NZ$854 found 6 days ago
Delta
Sun, 24 Aug. - Fri, 5 Sep.
SEA
Seattle
LHR
London
NZ$856 Return, found 6 days ago
NZ$856
Return
found 6 days ago
Select Delta flight, departing Sun, 24 Aug. from Seattle to London, returning Fri, 5 Sep., priced at NZ$856 found 6 days ago
United
Sun, 24 Aug. - Fri, 5 Sep.
SEA
Seattle
LHR
London
NZ$866 Return, found 6 days ago
NZ$866
Return
found 6 days ago
Select United flight, departing Sun, 24 Aug. from Seattle to London, returning Fri, 5 Sep., priced at NZ$866 found 6 days ago
Virgin Atlantic
Sun, 24 Aug. - Fri, 5 Sep.
SEA
Seattle
LHR
London
NZ$867 Return, found 6 days ago
NZ$867
Return
found 6 days ago
Select Virgin Atlantic flight, departing Sun, 24 Aug. from Seattle to London, returning Fri, 5 Sep., priced at NZ$867 found 6 days ago
Icelandair
Fri, 24 Oct. - Sun, 9 Nov.
SEA
Seattle
LGW
London
NZ$869 Return, found 1 day ago
NZ$869
Return
found 1 day ago
Select Icelandair flight, departing Fri, 24 Oct. from Seattle to London, returning Sun, 9 Nov., priced at NZ$869 found 1 day ago
United
Sun, 24 Aug. - Fri, 5 Sep.
SEA
Seattle
LHR
London
NZ$874 Return, found 6 days ago
NZ$874
Return
found 6 days ago
Select United flight, departing Sun, 24 Aug. from Seattle to London, returning Fri, 5 Sep., priced at NZ$874 found 6 days ago
United
Sun, 24 Aug. - Fri, 5 Sep.
SEA
Seattle
LHR
London
NZ$876 Return, found 6 days ago
NZ$876
Return
found 6 days ago
Select United flight, departing Sun, 24 Aug. from Seattle to London, returning Fri, 5 Sep., priced at NZ$876 found 6 days ago
Icelandair
Fri, 24 Oct. - Sun, 9 Nov.
SEA
Seattle
LHR
London
NZ$876 Return, found 1 day ago
NZ$876
Return
found 1 day ago
Select Icelandair flight, departing Fri, 24 Oct. from Seattle to London, returning Sun, 9 Nov., priced at NZ$876 found 1 day ago
United
Sun, 24 Aug. - Fri, 5 Sep.
SEA
Seattle
LHR
London
NZ$877 Return, found 6 days ago
NZ$877
Return
found 6 days ago
Select United flight, departing Sun, 24 Aug. from Seattle to London, returning Fri, 5 Sep., priced at NZ$877 found 6 days ago
KLM
Sun, 24 Aug. - Fri, 5 Sep.
SEA
Seattle
LHR
London
NZ$943 Return, found 6 days ago
NZ$943
Return
found 6 days ago
Select KLM flight, departing Sun, 24 Aug. from Seattle to London, returning Fri, 5 Sep., priced at NZ$943 found 6 days ago
Flight from Seattle to London route information
Origin airport
Seattle - Tacoma Intl.
Destination airport
Heathrow
Return price
NZ$853
Distance
7657 km

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 LON-All Airports ticket options cater to your travel preferences, with incredible one-way fares from NZ$579 and roundtrip prices from NZ$854. 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 LON-All Airports 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 London (LON-All Airports)?
Round-trip journeys from Seattle - Tacoma Intl. Airport (SEA) to London (LON-All Airports) start from NZ$854. This is based on fares offered within the last 7 days on Expedia for flights departing within the next year — book now so you don't miss out. 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 London (LON-All Airports)?
Most flights can be cancelled online, but each air carrier has its own terms and conditions. If you do decide to cancel your flight, visit our Customer Service Portal and follow the instructions.
How do I find cheap flights from SEA to London (LON-All Airports) 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 SEA to London (LON-All Airports) flights, you'll see a "no change fees" filter for you to select.
How many hours is the flight from Seattle - Tacoma Intl. Airport (SEA) to London (LON-All Airports)?
Make the 14 hours and 48 minutes between SEA and London (LON-All Airports) as comfortable as you can. Bring the essentials, like a water bottle, toothbrush and toiletries, and simply enjoy the flight!
How far is the flight from SEA to London (LON-All Airports)?
With around 7 700 kilometres separating SEA and London (LON-All Airports), your flight will be a long one. Pack wisely and make your time on board comfortable. Simple things like an eye mask and a good travel pillow can make a massive difference.
Which airlines fly direct from Seattle - Tacoma Intl. Airport (SEA) to London (LON-All Airports)?
You have lots of options when flying from SEA to London (LON-All Airports). Lock in your fare with one of these popular airlines:

  • 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-Tac Airport to London (LON-All Airports) flight tickets cheaper when they're purchased at the last minute?
Booking last minute from SEA to London (LON-All Airports) can be hit-or-miss. It is possible to score a bargain, but you could also miss out entirely! If you'd prefer to play it safe and start planning early on, Expedia compares flight deals up to 12 months in advance. Just remember that not all airlines publish their prices that far in advance. Our suggestion? Check back often as updates are made regularly.

Explore a world of travel with Expedia

London Flight Deals

London

Seattle to Heathrow
NZ$853.30
Seattle to Gatwick
NZ$868.80
*Available to Expedia members.