background

Flight Deals from London to Seattle from $171

Bundle + Save

Bundle + Save

Top flight deals from leading airlines:

AS LogoUA LogoAC LogoWS LogoQR LogoSQ LogoNH Logo

... and +100s more

Incredible Deals

Save up to 50% on select flights with Priceline

Bundle & Save

Save an average of $240 per person when bundling your flight and hotel together with Priceline

Best Price Guarantee

If a VIP member finds a better price elsewhere, we'll refund up to 200% of the difference

Help 24/7

We’re always here for you - reach us 24 hours a day, 7 days a week

Stops

  • Up to 2 stops
    $274
  • Up to 1 stop
    $274

Airlines

  • Air Canada
    $492
  • Alaska Airlines
    $1571
  • United Airlines
    $549
  • WestJet
    $274

Cabin Class

  • Economy
    $274

Departure Airports

  • London Airport
    $274

Arrival Airports

  • Seattle Tacoma International Airport
    $274

Layover Airports

  • Calgary International Airport
    $274
  • Chicago O Hare Airport
    $549
  • Denver International Airport
    $549
  • Edmonton Airport
    $1571
  • London Airport
    $274
  • Seattle Tacoma International Airport
    $274
  • Toronto Pearson Airport
    $492

Best Price. GUARANTEED.

Exclusively for Priceline Members
Tired of searching? Book now!
We'll refund the difference if you find a lower price.

WestJet Logo
WestJet

09/05/26

YXU
15h 35m
YYC

09/05/26

SEA
WestJet Logo
WestJet

09/13/26

SEA
6h 45m
YYC

09/14/26

YXU
$274
WestJet Logo
WestJet

09/05/26

YXU
12h 35m
YYC
SEA

09/05/26

SEA
WestJet Logo
WestJet

09/13/26

SEA
9h 45m
YYC
YXU

09/14/26

YXU
$274
Air Canada Logo
Air Canada

05/28/26

YXU
14h 38m
YYZ

05/28/26

SEA
Air Canada Logo
Air Canada

05/30/26

SEA
10h 38m
YYZ

05/30/26

YXU
$492
Bundle + Save
Book a flight & hotel together for extra savings.
On average save $240 per traveler
United Airlines Logo
United Airlines

05/28/26

YXU
11h 14m
YYZ
DEN

05/28/26

SEA
United Airlines Logo
United Airlines

05/30/26

SEA
11h 38m
ORD
YYZ

05/30/26

YXU
$549
Air Canada Logo
Air Canada

05/28/26

YXU
10h 28m
YYZ
YEG

05/28/26

SEA
Alaska Airlines Logo
Alaska Airlines

05/30/26

SEA
10h 33m
YEG
YYZ

05/30/26

YXU
$1571

Top Deals on flights from London to Seattle

London, CA (YXU) - Seattle, US (SEA)

WestJet Logo
WestJet

Aug 24

YXU
15h 35m
YYC

Aug 24

SEA

as low as

$171

Good to Know

Essential information to help you plan your flight from London to Seattle

Cheapest Flight

$171

The lowest price we found in the last two weeks, departing Aug 24 and returning Aug 24

Airline WS1 stop ‧ 15h 35m ‧ economy

Fastest Flights

$1571

The fastest flight that we found in the last two weeks, departing May 28 and returning May 30

Airline AS2 stops ‧ 10h 28m ‧ economy

Cheapest Flight Round-trip

$274

Cheapest price found in the last 14 days, departing Sep 5 and returning Sep 14

Airline WS1 stop ‧ 15h 35m ‧ economy

Cheapest Flight One-way

$171

Cheapest price found in the last 14 days, departing Aug 24

Airline WS1 stop ‧ 15h 35m ‧ economy

Cheapest Layover airport

$171

The cheapest layover airport to Seattle is currently $171

Airline WS1 stop ‧ 15h 35m ‧ economy

Best Arrival airport

$171

The best arrival airport to Seattle is currently $171

Airline WS1 stop ‧ 15h 35m ‧ economy

Best Departure airport

$171

The best departure airport to Seattle is currently $171

Airline WS1 stop ‧ 15h 35m ‧ economy

Cheapest Airline

$171

The cheapest airline to Seattle is currently $171

Airline WS1 stop ‧ 15h 35m ‧ economy