YKF - SEA

C$ 330 Find Cheap Flights from Toronto Region of Waterloo Intl to Seattle – Compare and Save

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Everything you should know

Cheapest round-trip
C$ 472
Typical prices: C$ 393-C$ 483
WestJet
Sat 22/9Fri 28/9
YKF - SEA • 1 stop
Cheapest one-way flights
C$ 330
Typical prices: C$ 268-C$ 374
Multiple Airlines
Wed 17/10
YKF - SEA • 3 stops
When to travel
November
Cheapest • 48% price drop
August
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Toronto Pearson Intl (YYZ)
Cheapest • Avg C$ 411 (round-trip)
Calgary (YYC)
Shortest trip • 11h 22m (one-way)
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Flight Deals

Cheap Flights from Region of Waterloo Intl to Seattle (YKF-SEA)

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

Recent round-trip flight deals from Region of Waterloo Intl to Seattle

Tue, 22 Sep - Mon, 28 Sep
WestJet Logo
8:40 p.m. - 9:40 a.m.YKF  Toronto Region of Waterloo Intl-SEA Seattle/Tacoma Intl
16h 00m1 stop Calgary
WestJet Logo
7:35 p.m. - 7:50 p.m.SEA  Seattle/Tacoma Intl-YKF Toronto Region of Waterloo Intl
21h 15m1 stop Calgary
C$ 472WestJet
Fri, 25 Sep - Tue, 29 Sep
WestJet Logo
8:40 p.m. - 9:40 a.m.YKF  Toronto Region of Waterloo Intl-SEA Seattle/Tacoma Intl
16h 00m1 stop Calgary
WestJet Logo
7:35 p.m. - 7:50 p.m.SEA  Seattle/Tacoma Intl-YKF Toronto Region of Waterloo Intl
21h 15m1 stop Calgary
C$ 474WestJet
Fri, 16 Oct - Tue, 20 Oct
WestJet Logo
8:40 p.m. - 9:40 a.m.YKF  Toronto Region of Waterloo Intl-SEA Seattle/Tacoma Intl
16h 00m1 stop Calgary
WestJet Logo
7:35 p.m. - 7:50 p.m.SEA  Seattle/Tacoma Intl-YKF Toronto Region of Waterloo Intl
21h 15m1 stop Calgary
C$ 481WestJet
Fri, 25 Sep - Sun, 27 Sep
WestJet Logo
8:40 p.m. - 6:45 p.m.YKF  Toronto Region of Waterloo Intl-SEA Seattle/Tacoma Intl
25h 05m1 stop Calgary
WestJet Logo
7:35 p.m. - 7:50 p.m.SEA  Seattle/Tacoma Intl-YKF Toronto Region of Waterloo Intl
21h 15m1 stop Calgary
C$ 495WestJet
Tue, 22 Sep - Sat, 26 Sep
WestJet Logo
8:40 p.m. - 9:40 a.m.YKF  Toronto Region of Waterloo Intl-SEA Seattle/Tacoma Intl
16h 00m1 stop Calgary
WestJet Logo
7:35 p.m. - 7:50 p.m.SEA  Seattle/Tacoma Intl-YKF Toronto Region of Waterloo Intl
21h 15m1 stop Calgary
C$ 495WestJet
Tue, 22 Sep - Mon, 28 Sep
WestJet Logo
8:40 p.m. - 9:40 a.m.YKF  Toronto Region of Waterloo Intl-SEA Seattle/Tacoma Intl
16h 00m1 stop Calgary
WestJet Logo
7:35 p.m. - 7:50 p.m.SEA  Seattle/Tacoma Intl-YKF Toronto Region of Waterloo Intl
21h 15m1 stop Calgary
C$ 495WestJet
Sat, 3 Oct - Sat, 10 Oct
WestJet Logo
8:40 p.m. - 9:40 a.m.YKF  Toronto Region of Waterloo Intl-SEA Seattle/Tacoma Intl
16h 00m1 stop Calgary
WestJet Logo
7:35 p.m. - 7:50 p.m.SEA  Seattle/Tacoma Intl-YKF Toronto Region of Waterloo Intl
21h 15m1 stop Calgary
C$ 503WestJet
Thu, 1 Oct - Wed, 7 Oct
Multiple Airlines Logo
8:40 p.m. - 6:45 p.m.YKF  Toronto Region of Waterloo Intl-SEA Seattle/Tacoma Intl
25h 05m1 stop Calgary
Multiple Airlines Logo
7:35 p.m. - 3:00 p.m.SEA  Seattle/Tacoma Intl-YKF Toronto Region of Waterloo Intl
16h 25m1 stop Calgary
C$ 578Multiple Airlines
Thu, 15 Oct - Tue, 20 Oct
Multiple Airlines Logo
6:05 a.m. - 6:45 p.m.YKF  Toronto Region of Waterloo Intl-SEA Seattle/Tacoma Intl
15h 40m1 stop Calgary
Multiple Airlines Logo
7:35 p.m. - 7:50 p.m.SEA  Seattle/Tacoma Intl-YKF Toronto Region of Waterloo Intl
21h 15m1 stop Calgary
C$ 594Multiple Airlines
Mon, 21 Sep - Mon, 28 Sep
WestJet Logo
8:40 p.m. - 6:45 p.m.YKF  Toronto Region of Waterloo Intl-SEA Seattle/Tacoma Intl
25h 05m1 stop Calgary
WestJet Logo
7:35 p.m. - 7:50 p.m.SEA  Seattle/Tacoma Intl-YKF Toronto Region of Waterloo Intl
21h 15m1 stop Calgary
C$ 608WestJet
Booking Insights

Price, demand, and travel trends for Toronto Region of Waterloo Intl Airport to Seattle flights

Use KAYAK data on prices, travel dates, airlines, and seasonal trends to compare options and book flights from Toronto Region of Waterloo Intl Airport to Seattle with more confidence.

How much is a round-trip flight from Toronto Region of Waterloo Intl Airport to Seattle?

Round-trip flights from Toronto Region of Waterloo Intl Airport to Seattle start at C$ 472. Prices are typical for this route right now, with typical round-trip fares ranging from C$ 393 to C$ 483. The lowest price found in the past 5 days was C$ 472 on WestJet.

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Key details for Toronto Region of Waterloo Intl Airport to Seattle flights

Low season

January

Cheapest flight

C$ 330
Most popular time to fly (1% more expensive on average)
Flights from Toronto Region of Waterloo Intl Airport to Seattle

When to book flights from Region of Waterloo Intl to Seattle

Are your dates flexible? Find out the best times to travel from Region of Waterloo Intl 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 Toronto Region of Waterloo Intl Airport 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 Toronto Region of Waterloo Intl Airport to Seattle?

    Flights from Toronto Region of Waterloo Intl Airport to Seattle usually depart from Toronto Region of Waterloo Intl (YKF) and arrive at Seattle/Tacoma Intl (SEA).

  • Which cabin classes can I book on flights from Toronto Region of Waterloo Intl Airport to Seattle?

    Two cabin classes are available on flights from Toronto Region of Waterloo Intl Airport to Seattle:

    • Economy Class
    • Premium Economy Class

  • Which airports do connecting flights from Toronto Region of Waterloo Intl Airport to Seattle pass through?

    Connecting flights from Toronto Region of Waterloo Intl Airport to Seattle most commonly pass through:

    • Calgary (YYC) – 79% of one-stop connections
    • Toronto Pearson Intl (YYZ) – 21% 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 Toronto Region of Waterloo Intl Airport to Seattle?

    Yes. Being flexible with your travel dates can save you up to 60% on the Toronto Region of Waterloo Intl Airport to Seattle route. Thursday is the cheapest departure day at C$ 272 round-trip on average, while Sunday is the most expensive at C$ 671, a difference of C$ 400. 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 Toronto Region of Waterloo Intl Airport to Seattle take?

    There are currently no direct flights available from Toronto Region of Waterloo Intl Airport to Seattle. Flights with 1 layover take between 8h 20m and 11h 22m in total, depending on the connection.

  • Do I need a passport to fly from Toronto Region of Waterloo Intl Airport 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 Toronto Region of Waterloo Intl Airport 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$ 472 to C$ 1,305. That means the highest observed fare was about 3x higher than the lowest one.

  • How are flight prices from Toronto Region of Waterloo Intl Airport to Seattle looking right now?

    One-way fares from Toronto Region of Waterloo Intl Airport to Seattle are currently higher than usual. Average one-way flight prices are about C$ 395, which is 39% above the typical average for this route.

  • How much time can I save by choosing a different layover airport when travelling from Toronto Region of Waterloo Intl Airport to Seattle?

    Flying via Toronto Pearson Intl (YYZ) gives the shortest average 1-stop total travel time at 8h 20m, compared with 11h 22m via Calgary (YYC).

  • What is the time difference between Toronto Region of Waterloo Intl Airport and Seattle?

    Seattle is 3 hours behind Toronto Region of Waterloo Intl Airport (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 Toronto Region of Waterloo Intl Airport to Seattle flight?

    Round-trip flights from Toronto Region of Waterloo Intl Airport to Seattle range from C$ 393 to C$ 483, with an average of C$ 474 over the past 12 months. Anything below C$ 393 counts as a good deal.

Your guide to booking Toronto Region of Waterloo Intl Airport 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 Thursday departure instead of Sunday. On this route, Thursday flights average C$ 272 – about C$ 400 less than Sunday (60% savings) based on the last 12 months.
  • If you can choose when to travel, plan your Toronto Region of Waterloo Intl Airport to Seattle trip for November. Fares historically average C$ 247 round-trip in that month – typically C$ 236 less than the most expensive month, which is July (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 Region of Waterloo Intl to Seattle

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

Car rentals in Seattle
Hotels in Seattle
Vacations in Seattle