YXU - SEA

C$ 275 Find Cheap Flights from London to Seattle – Compare and Save

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Everything you should know

Cheapest round-trip
C$ 509
Typical prices: C$ 379-C$ 575
WestJet
Sun 21/10Mon 22/10
YXU - SEA • 1 stop
Cheapest one-way flights
C$ 275
Typical prices: C$ 318-C$ 480
WestJet
Sun 4/2
YXU - SEA • 1 stop
Direct flights
Not available
There are currently no direct flights between London and Seattle. You'll need to take a connecting flight to reach the destination.
Insights
Insights
When to travel
April
Cheapest • 24% price drop
August
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Calgary (YYC)
Cheapest • Avg C$ 409 (round-trip)
Toronto Pearson Intl (YYZ)
Shortest trip • 8h 00m (one-way)
Insights
Insights
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We hope you enjoy your trip to Seattle!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from London to Seattle (YXU-SEA)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from London to Seattle

Wed, 21 Oct - Thu, 22 Oct
WestJet Logo
6:10 a.m. - 6:45 p.m.YXU  London-SEA Seattle/Tacoma Intl
15h 35m1 stop Calgary
WestJet Logo
7:35 p.m. - 5:20 a.m.SEA  Seattle/Tacoma Intl-YXU London
6h 45m1 stop Calgary
C$ 509WestJet
Tue, 8 Dec - Thu, 21 Jan
WestJet Logo
6:40 a.m. - 1:40 p.m.YXU  London-SEA Seattle/Tacoma Intl
10h 00m1 stop Calgary
WestJet Logo
2:30 p.m. - 5:35 a.m.SEA  Seattle/Tacoma Intl-YXU London
12h 05m1 stop Calgary
C$ 512WestJet
Tue, 8 Dec - Tue, 19 Jan
WestJet Logo
6:40 a.m. - 1:40 p.m.YXU  London-SEA Seattle/Tacoma Intl
10h 00m1 stop Calgary
WestJet Logo
2:30 p.m. - 5:35 a.m.SEA  Seattle/Tacoma Intl-YXU London
12h 05m1 stop Calgary
C$ 520WestJet
Wed, 17 Feb - Wed, 24 Feb
WestJet Logo
6:40 a.m. - 1:40 p.m.YXU  London-SEA Seattle/Tacoma Intl
10h 00m1 stop Calgary
WestJet Logo
2:30 p.m. - 5:35 a.m.SEA  Seattle/Tacoma Intl-YXU London
12h 05m1 stop Calgary
C$ 526WestJet
Wed, 13 Jan - Tue, 23 Feb
WestJet Logo
6:40 a.m. - 1:40 p.m.YXU  London-SEA Seattle/Tacoma Intl
10h 00m1 stop Calgary
WestJet Logo
2:30 p.m. - 5:35 a.m.SEA  Seattle/Tacoma Intl-YXU London
12h 05m1 stop Calgary
C$ 530WestJet
Thu, 14 Jan - Wed, 24 Feb
WestJet Logo
6:40 a.m. - 1:40 p.m.YXU  London-SEA Seattle/Tacoma Intl
10h 00m1 stop Calgary
WestJet Logo
2:30 p.m. - 5:35 a.m.SEA  Seattle/Tacoma Intl-YXU London
12h 05m1 stop Calgary
C$ 538WestJet
Mon, 7 Dec - Wed, 20 Jan
WestJet Logo
6:40 a.m. - 1:40 p.m.YXU  London-SEA Seattle/Tacoma Intl
10h 00m1 stop Calgary
WestJet Logo
2:30 p.m. - 5:35 a.m.SEA  Seattle/Tacoma Intl-YXU London
12h 05m1 stop Calgary
C$ 577WestJet
Thu, 14 Jan - Tue, 23 Feb
WestJet Logo
6:40 a.m. - 1:40 p.m.YXU  London-SEA Seattle/Tacoma Intl
10h 00m1 stop Calgary
WestJet Logo
2:30 p.m. - 5:35 a.m.SEA  Seattle/Tacoma Intl-YXU London
12h 05m1 stop Calgary
C$ 578WestJet
Wed, 13 Jan - Wed, 24 Feb
WestJet Logo
6:40 a.m. - 1:40 p.m.YXU  London-SEA Seattle/Tacoma Intl
10h 00m1 stop Calgary
WestJet Logo
2:30 p.m. - 5:35 a.m.SEA  Seattle/Tacoma Intl-YXU London
12h 05m1 stop Calgary
C$ 594WestJet
Wed, 21 Oct - Thu, 22 Oct
WestJet Logo
6:10 a.m. - 6:45 p.m.YXU  London-SEA Seattle/Tacoma Intl
15h 35m1 stop Calgary
WestJet Logo
7:35 p.m. - 5:20 a.m.SEA  Seattle/Tacoma Intl-YXU London
6h 45m1 stop Calgary
C$ 605WestJet
Booking Insights

Price, demand, and travel trends for London to Seattle flights

Use KAYAK data on prices, travel dates, airlines, and seasonal trends to compare options and book flights from London to Seattle with more confidence.

How much is a round-trip flight from London to Seattle?

Round-trip flights from London to Seattle start at C$ 509. Prices are typical for this route right now, with typical round-trip fares ranging from C$ 379 to C$ 575. The lowest price found in the past 5 days was C$ 509 on WestJet.

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Key details for London to Seattle flights

Low season

February

Cheapest flight

C$ 275
Most popular time to fly (88% more expensive on average)
Flights from London to Seattle

When to book flights from London to Seattle

Are your dates flexible? Find out the best times to travel from London to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

Your London to Seattle flight questions, answered

Find helpful route details based on KAYAK data, including flight times, airports, airlines, and booking questions.

  • Which airports can I use when flying from London to Seattle?

    Flights from London to Seattle usually depart from London (YXU) and arrive at Seattle/Tacoma Intl (SEA).

  • Which cabin classes can I book on flights from London to Seattle?

    Only Economy Class is available on flights from London to Seattle.

  • Which airports do connecting flights from London to Seattle pass through?

    Connecting flights from London to Seattle most commonly pass through:

    • Calgary (YYC) – 76% of one-stop connections
    • Toronto Pearson Intl (YYZ) – 24% of one-stop connections
    Together, these airports account for 100% of one-stop bookings on this route.

  • Can I save money by using flexible dates for flights from London to Seattle?

    Yes. Being flexible with your travel dates can save you up to 55% on the London to Seattle route. Tuesday is the cheapest departure day at C$ 416 round-trip on average, while Thursday is the most expensive at C$ 906, a difference of C$ 490. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • Which popular places can I visit in Seattle?

    Some of the most popular sights in Seattle are Lumen Field, T-Mobile Park, and Seattle Waterfront. These are among the most viewed places in Seattle on KAYAK.

  • How long does a flight from London to Seattle take?

    A direct flight from London to Seattle takes 0h 00m, covering 5,181 km.

  • Do I need a passport to fly from London to Seattle?

    Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

  • Have flight prices from London to Seattle changed much recently?

    Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about C$ 509 to C$ 1,401. That means the highest observed fare was about 3x higher than the lowest one.

  • How are flight prices from London to Seattle looking right now?

    One-way fares from London to Seattle are currently higher than usual. Average one-way flight prices are about C$ 419, which is 11% above the typical average for this route.

  • How much time can I save by choosing a different layover airport when travelling from London to Seattle?

    Flying via Toronto Pearson Intl (YYZ) gives the shortest average 1-stop total travel time at 8h 00m, compared with 12h 35m via Calgary (YYC).

  • What is the time difference between London and Seattle?

    Seattle is 3 hours behind London (Pacific Time vs Eastern Time). Plan for the time shift when scheduling connections or first-day activities.

  • What car rental options are available at Seattle/Tacoma Intl Airport (SEA)?

    Seattle/Tacoma Intl Airport (SEA) hosts 5 major car rental companies, with daily rates starting from around C$ 5 for economy cars. Top options include:
    • Fox
    • Europcar
    • Thrifty
    • Budget
    • Dollar

  • How much should I expect to pay for a London to Seattle flight?

    Round-trip flights from London to Seattle range from C$ 379 to C$ 575, with an average of C$ 452 over the past 12 months. Anything below C$ 379 counts as a good deal.

Your guide to booking London to Seattle flights

Get tips on when to book, when to fly, and what to know before your trip.
  • If your dates are flexible, aim for a Tuesday departure instead of Thursday. On this route, Tuesday flights average C$ 416 – about C$ 490 less than Thursday (54% savings) based on the last 12 months.
  • If you can choose when to travel, plan your London to Seattle trip for April. Fares historically average C$ 343 round-trip in that month – typically C$ 563 less than the most expensive month, which is June (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to Seattle/Tacoma Intl Airport.
    - Seattle Airport Marriott
    - Coast Gateway Hotel
    - Fairfield by Marriott Inn & Suites Seattle Sea-Tac Airport

More options for your flight from London to Seattle

Complete your trip to Seattle with a hotel stay or car rental

Car rentals in Seattle
Hotels in Seattle
Vacations in Seattle