SEA - YXU

$628 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
$628
Typical prices: $563-$642
Multiple Airlines
Thu 12/13Thu 12/20
SEA - YXU • 2 stops
Top layover airports
Calgary (YYC)
Cheapest • Avg $490 (round-trip)
Toronto Pearson Intl (YYZ)
Shortest trip • 8h 38m (one-way)
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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

Sun, Dec 13 - Sun, Dec 20
Multiple Airlines Logo
10:35 am - 5:45 pmSEA  Seattle/Tacoma Intl-YXU London
28h 10m2 stops San Diego Fort Lauderdale
Multiple Airlines Logo
6:15 am - 10:49 amYXU  London-SEA Seattle/Tacoma Intl
31h 34m1 stop Fort Lauderdale
$628Multiple Airlines
Sun, Dec 13 - Sun, Dec 20
Multiple Airlines Logo
9:29 pm - 5:45 pmSEA  Seattle/Tacoma Intl-YXU London
17h 16m1 stop Fort Lauderdale
Multiple Airlines Logo
6:15 am - 10:49 amYXU  London-SEA Seattle/Tacoma Intl
31h 34m1 stop Fort Lauderdale
$650Multiple Airlines
Fri, Dec 11 - Fri, Dec 18
WestJet Logo
2:30 pm - 5:35 amSEA  Seattle/Tacoma Intl-YXU London
12h 05m1 stop Calgary
WestJet Logo
6:40 am - 1:40 pmYXU  London-SEA Seattle/Tacoma Intl
10h 00m1 stop Calgary
$688WestJet
Wed, Dec 9 - Wed, Dec 16
WestJet Logo
2:30 pm - 5:35 amSEA  Seattle/Tacoma Intl-YXU London
12h 05m1 stop Calgary
WestJet Logo
6:40 am - 1:40 pmYXU  London-SEA Seattle/Tacoma Intl
10h 00m1 stop Calgary
$706WestJet
Fri, Dec 11 - Fri, Dec 18
Multiple Airlines Logo
2:30 pm - 5:35 amSEA  Seattle/Tacoma Intl-YXU London
12h 05m1 stop Calgary
Multiple Airlines Logo
6:15 am - 12:22 pmYXU  London-SEA Seattle/Tacoma Intl
33h 07m3 stops Fort Lauderdale Houston George Bush Intcntl Denver Intl
$720Multiple Airlines
Fri, Dec 11 - Fri, Dec 18
Multiple Airlines Logo
2:30 pm - 5:35 amSEA  Seattle/Tacoma Intl-YXU London
12h 05m1 stop Calgary
Multiple Airlines Logo
6:15 am - 11:53 amYXU  London-SEA Seattle/Tacoma Intl
32h 38m2 stops Fort Lauderdale Minneapolis St Paul
$732Multiple Airlines
Sun, Dec 13 - Sun, Dec 20
Multiple Airlines Logo
9:09 pm - 5:35 amSEA  Seattle/Tacoma Intl-YXU London
29h 26m3 stops Las Vegas Harry Reid Intl Phoenix Sky Harbor Intl Calgary
Multiple Airlines Logo
6:15 am - 12:22 pmYXU  London-SEA Seattle/Tacoma Intl
33h 07m3 stops Fort Lauderdale Atlanta Hartsfield-Jackson Denver Intl
$777Multiple Airlines
Sun, Dec 13 - Sun, Dec 20
Multiple Airlines Logo
9:09 pm - 5:35 amSEA  Seattle/Tacoma Intl-YXU London
29h 26m3 stops Las Vegas Harry Reid Intl Phoenix Sky Harbor Intl Calgary
Multiple Airlines Logo
6:15 am - 10:51 pmYXU  London-SEA Seattle/Tacoma Intl
19h 36m2 stops Fort Lauderdale Minneapolis St Paul
$788Multiple Airlines
Sun, Dec 13 - Sun, Dec 20
Multiple Airlines Logo
2:30 pm - 5:35 amSEA  Seattle/Tacoma Intl-YXU London
12h 05m1 stop Calgary
Multiple Airlines Logo
6:15 am - 12:22 pmYXU  London-SEA Seattle/Tacoma Intl
33h 07m3 stops Fort Lauderdale Atlanta Hartsfield-Jackson Denver Intl
$883Multiple Airlines
Sun, Mar 14 - Sun, Mar 28
Air Canada Logo
8:40 am - 9:49 pmSEA  Seattle/Tacoma Intl-YXU London
10h 09m2 stops Vancouver Intl Toronto Pearson Intl
Air Canada Logo
9:15 am - 6:23 pmYXU  London-SEA Seattle/Tacoma Intl
12h 08m2 stops Toronto Pearson Intl Vancouver Intl
$894Air Canada
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 with more confidence.

Which airline is the cheapest to fly from Seattle to London?

WestJet ($688) and Air Canada ($894) are the cheapest airlines to fly round-trip from Seattle to London according to KAYAK data over the last 5 days.

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Key details for Seattle to London flights

Cheapest flight

$628
Round-trip flight 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 answers about this route, including flight times, airports, airlines and booking tips.

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

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

  • How long is a flight from Seattle to London?

    There are currently no nonstop flights available from Seattle to London. Flights with 1 layover take between 8h 38m and 11h 56m in total, depending on the connection.

  • 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.

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

    Round-trip flights from Seattle to London range from $563 to $642, with an average of $632 over the past 12 months. Anything below $563 counts as a good deal.

  • 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 $628 to $1,298. That means the highest observed fare was about 2x higher than the lowest one.

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

    London Airport (YXU) hosts 5 major car rental companies, with daily rates averaging $60 for economy cars. Top options include:

    • Alamo
    • Enterprise Rent-A-Car
    • Budget
    • National
    • Avis

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

    Connecting flights from Seattle to London most commonly pass through:

    • Toronto Pearson Intl (YYZ) - 60% of one-stop connections
    • Calgary (YYC) - 40% of one-stop connections

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

    Yes. Flexible dates can save you up to 13% on flights from Seattle to London. Friday is the cheapest departure day at $563 round-trip on average, while Wednesday is the most expensive at $642, a difference of $79.

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

    Flying via Toronto Pearson Intl (YYZ) gives the shortest average 1-stop total travel time at 8h 38m, compared with 11h 56m 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.

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 and avoid flying on Wednesday. On this route, Friday flights average $563, about $79 less than Wednesday fares (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
Vacations in London