SEA - YXU

C$ 214 Find Cheap Flights from Seattle to London – Compare and Save

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1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
C$ 521
Typical prices: C$ 788-C$ 899
WestJet
Mon 15/10Tue 16/10
SEA - YXU • 1 stop
Cheapest one-way flights
C$ 214
Typical prices: C$ 266-C$ 622
WestJet
Mon 15/10
SEA - YXU • 1 stop
Direct flights
Not available
There are currently no direct flights between Seattle and London. You'll need to take a connecting flight to reach the destination.
Insights
Insights
Top layover airports
Calgary (YYC)
Cheapest • Avg C$ 752 (round-trip)
Toronto Pearson Intl (YYZ)
Shortest trip • 8h 38m (one-way)
Insights
Insights
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Flight Deals

Cheap Flights from Seattle to London (SEA-YXU)

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

Recent round-trip flight deals from Seattle to London

Thu, 15 Oct - Fri, 16 Oct
WestJet Logo
7:35 p.m. - 5:20 a.m.SEA  Seattle/Tacoma Intl-YXU London
6h 45m1 stop Calgary
WestJet Logo
5:55 p.m. - 9:40 a.m.YXU  London-SEA Seattle/Tacoma Intl
18h 45m1 stop Calgary
C$ 521WestJet
Tue, 20 Oct - Sat, 24 Oct
WestJet Logo
7:35 p.m. - 5:20 a.m.SEA  Seattle/Tacoma Intl-YXU London
6h 45m1 stop Calgary
WestJet Logo
6:10 a.m. - 6:45 p.m.YXU  London-SEA Seattle/Tacoma Intl
15h 35m1 stop Calgary
C$ 582WestJet
Tue, 20 Oct - Sat, 24 Oct
WestJet Logo
7:35 p.m. - 5:20 a.m.SEA  Seattle/Tacoma Intl-YXU London
6h 45m1 stop Calgary
WestJet Logo
6:10 a.m. - 6:45 p.m.YXU  London-SEA Seattle/Tacoma Intl
15h 35m1 stop Calgary
C$ 694WestJet
Thu, 15 Oct - Mon, 19 Oct
Multiple Airlines Logo
7:35 p.m. - 5:20 a.m.SEA  Seattle/Tacoma Intl-YXU London
6h 45m1 stop Calgary
Multiple Airlines Logo
6:10 a.m. - 11:03 p.m.YXU  London-SEA Seattle/Tacoma Intl
19h 53m2 stops Calgary San Francisco
C$ 700Multiple Airlines
Thu, 29 Oct - Thu, 5 Nov
Multiple Airlines Logo
8:09 p.m. - 6:35 a.m.SEA  Seattle/Tacoma Intl-YXU London
31h 26m2 stops Los Angeles Los Angeles Calgary
Multiple Airlines Logo
6:40 a.m. - 1:40 p.m.YXU  London-SEA Seattle/Tacoma Intl
10h 00m1 stop Calgary
C$ 704Multiple Airlines
Tue, 20 Oct - Sat, 24 Oct
WestJet Logo
7:35 p.m. - 5:20 a.m.SEA  Seattle/Tacoma Intl-YXU London
6h 45m1 stop Calgary
WestJet Logo
6:10 a.m. - 6:45 p.m.YXU  London-SEA Seattle/Tacoma Intl
15h 35m1 stop Calgary
C$ 725WestJet
Thu, 15 Oct - Mon, 19 Oct
Multiple Airlines Logo
7:35 p.m. - 5:20 a.m.SEA  Seattle/Tacoma Intl-YXU London
6h 45m1 stop Calgary
Multiple Airlines Logo
5:55 p.m. - 7:49 p.m.YXU  London-SEA Seattle/Tacoma Intl
28h 54m1 stop Calgary
C$ 761Multiple Airlines
Fri, 30 Oct - Fri, 6 Nov
Multiple Airlines Logo
3:30 p.m. - 6:35 a.m.SEA  Seattle/Tacoma Intl-YXU London
12h 05m1 stop Calgary
Multiple Airlines Logo
6:40 a.m. - 2:44 p.m.YXU  London-SEA Seattle/Tacoma Intl
35h 04m2 stops Calgary Vancouver Intl
C$ 796Multiple Airlines
Thu, 15 Oct - Fri, 16 Oct
Multiple Airlines Logo
11:20 a.m. - 5:20 a.m.SEA  Seattle/Tacoma Intl-YXU London
15h 00m2 stops Vancouver Intl Calgary
Multiple Airlines Logo
5:55 p.m. - 9:40 a.m.YXU  London-SEA Seattle/Tacoma Intl
18h 45m1 stop Calgary
C$ 805Multiple Airlines
Fri, 30 Oct - Fri, 6 Nov
Multiple Airlines Logo
3:30 p.m. - 6:35 a.m.SEA  Seattle/Tacoma Intl-YXU London
12h 05m1 stop Calgary
Multiple Airlines Logo
6:40 a.m. - 9:06 a.m.YXU  London-SEA Seattle/Tacoma Intl
29h 26m1 stop Calgary
C$ 856Multiple Airlines
Booking Insights

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

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

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

Round-trip flights from Seattle to London start at C$ 521. Prices are below average for this route right now, with typical round-trip fares ranging from C$ 788 to C$ 899. The lowest price found in the past 5 days was C$ 521 on WestJet.

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Key details for Seattle to London flights

Cheapest flight

C$ 214
Flights from Seattle to London

When to book flights from Seattle to London

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

Your Seattle to London 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 Seattle to London?

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

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

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

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

    Connecting flights from Seattle to London most commonly pass through:

    • Calgary (YYC) – 50% of one-stop connections
    • Toronto Pearson Intl (YYZ) – 50% 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 Seattle to London?

    Yes. Being flexible with your travel dates can save you up to 13% on the Seattle to London route. Friday is the cheapest departure day at C$ 788 round-trip on average, while Wednesday is the most expensive at C$ 898, a difference of C$ 111. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

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

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

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

    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 Seattle to London 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$ 521 to C$ 1,504. That means the highest observed fare was about 3x higher than the lowest one.

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

    One-way fares from Seattle to London are currently lower than usual. Average one-way flight prices are about C$ 341, which is 33% below the typical average for this route.

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

    Flying via Toronto Pearson Intl (YYZ) gives the shortest average 1-stop total travel time at 8h 38m, compared with 13h 29m via Calgary (YYC).

  • What is the time difference between Seattle and London?

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

  • What car rental options are available at London Airport (YXU)?

    London Airport (YXU) hosts 5 major car rental companies, with daily rates starting from around C$ 40 for economy cars. Top options include:
    • Alamo
    • Enterprise Rent-A-Car
    • Budget
    • National
    • Avis

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

    Round-trip flights from Seattle to London range from C$ 788 to C$ 899, with an average of C$ 884 over the past 12 months. Anything below C$ 788 counts as a good deal.

Your guide to booking Seattle to London 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 Friday departure instead of Wednesday. On this route, Friday flights average C$ 788 – about C$ 111 less than Wednesday (12% savings) based on the last 12 months.
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to London Airport.
    - Best Western London Airport Inn & Suites
    - London residency inn

More options for your flight from Seattle to London

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

Car rentals in London
Hotels in London
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