YKF - SEA

C$ 199 Find Cheap Flights from Toronto Region of Waterloo Intl to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Region of Waterloo Intl to Seattle departing on 23/2. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Seattle

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Toronto to Seattle, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Toronto to Seattle, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
C$ 314
WestJet
Fri 1/5Fri 8/5
YKF - SEA • 1 stop
Cheapest one-way flights
C$ 199
WestJet
Mon 23/2
YKF - SEA • 1 stop
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KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Seattle!
Flight Deals
Booking Insights
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Region of Waterloo Intl to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
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

Fri, 1 May - Fri, 8 May
WestJet Logo
6:00 a.m. - 1:08 p.m.
YKF
-
SEA
10h 08m
1 stop
WestJet Logo
2:05 p.m. - 12:45 a.m.
SEA
-
YKF
7h 40m
1 stop
C$ 314WestJet
Sat, 2 May - Sun, 10 May
WestJet Logo
6:00 a.m. - 1:08 p.m.
YKF
-
SEA
10h 08m
1 stop
WestJet Logo
2:05 p.m. - 12:45 a.m.
SEA
-
YKF
7h 40m
1 stop
C$ 318WestJet
Thu, 5 Mar - Mon, 9 Mar
WestJet Logo
6:20 a.m. - 2:19 p.m.
YKF
-
SEA
10h 59m
1 stop
WestJet Logo
3:10 p.m. - 5:29 a.m.
SEA
-
YKF
11h 19m
1 stop
C$ 355WestJet
Thu, 5 Mar - Mon, 9 Mar
WestJet Logo
6:20 a.m. - 2:19 p.m.
YKF
-
SEA
10h 59m
1 stop
WestJet Logo
3:10 p.m. - 5:29 a.m.
SEA
-
YKF
11h 19m
1 stop
C$ 362WestJet
Thu, 26 Feb - Sun, 1 Mar
Multiple Airlines Logo
6:20 a.m. - 2:19 p.m.
YKF
-
SEA
10h 59m
1 stop
Multiple Airlines Logo
11:08 p.m. - 5:29 a.m.
SEA
-
YKF
27h 21m
2 stops
C$ 431Multiple Airlines
Fri, 8 May - Sat, 16 May
WestJet Logo
8:40 p.m. - 6:45 p.m.
YKF
-
SEA
25h 05m
1 stop
WestJet Logo
7:35 p.m. - 7:50 p.m.
SEA
-
YKF
21h 15m
1 stop
C$ 456WestJet
Mon, 23 Feb - Mon, 2 Mar
WestJet Logo
6:20 a.m. - 2:19 p.m.
YKF
-
SEA
10h 59m
1 stop
WestJet Logo
3:10 p.m. - 5:29 a.m.
SEA
-
YKF
11h 19m
1 stop
C$ 482WestJet
Mon, 23 Feb - Mon, 2 Mar
Multiple Airlines Logo
6:20 a.m. - 10:57 p.m.
YKF
-
SEA
19h 37m
3 stops
Multiple Airlines Logo
11:55 a.m. - 5:29 a.m.
SEA
-
YKF
14h 34m
2 stops
C$ 501Multiple Airlines
Tue, 24 Feb - Sun, 1 Mar
WestJet Logo
6:20 a.m. - 2:19 p.m.
YKF
-
SEA
10h 59m
1 stop
WestJet Logo
11:55 a.m. - 5:29 a.m.
SEA
-
YKF
14h 34m
3 stops
C$ 531WestJet
Thu, 26 Feb - Sun, 1 Mar
WestJet Logo
6:20 a.m. - 2:19 p.m.
YKF
-
SEA
10h 59m
1 stop
WestJet Logo
3:10 p.m. - 5:29 a.m.
SEA
-
YKF
11h 19m
1 stop
C$ 533WestJet
Booking Insights

KAYAK's insights & trends for Region of Waterloo Intl to Seattle flights

Get data-powered insights and trends into flights from Region of Waterloo Intl to Seattle to help you find the cheapest flights, the best time to fly and much more.

What is the most popular layover airport when flying from Toronto Region of Waterloo Intl to Seattle?

Percentage of one-stop round-trip flights from Toronto Region of Waterloo Intl to Seattle chosen by KAYAK users via each layover airport in the last 12 months (only includes trips with the same layover airport on both legs).

Calgary (YYC) is the top choice – 76% of KAYAK users who clicked on one-stop flights from Toronto Region of Waterloo Intl to Seattle picked an itinerary connecting there.

What is the cheapest layover airport when flying from Toronto Region of Waterloo Intl to Seattle?

Average round-trip price for one-stop flights from Toronto Region of Waterloo Intl to Seattle clicked by KAYAK users in the last 12 months (only includes trips with the same layover airport on both legs).

Flights via Calgary (YYC) offer the most affordable fares, with an average round-trip price of C$ 298.

Which layover airport offers the shortest total travel time from Toronto Region of Waterloo Intl to Seattle?

Shortest average total travel time for one-stop one-way flights from Toronto Region of Waterloo Intl to Seattle via different layover airports, based on KAYAK user data from the last 12 months.

Consider flying via Toronto (YYZ) for the shortest journey. The average one-way travel time for flights connecting there is 9h 29m.

Which layover airport has the quickest connection when flying from Toronto Region of Waterloo Intl to Seattle?

Average layover duration at different layover airports for one-stop one-way flights from Toronto Region of Waterloo Intl to Seattle, based on KAYAK user data from the last 12 months.

If you prefer a quick connection, Toronto (YYZ) often has the shortest layovers from Toronto Region of Waterloo Intl to Seattle, with an average of 2h 10m.

Good to know

Cheapest flightC$ 199
Flight from Toronto Region of Waterloo Intl 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
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Toronto Region of Waterloo Intl to Seattle flights

  • What is the cheapest flight from Toronto Region of Waterloo Intl Airport to Seattle?

    In the last 3 days, the lowest price for a flight from Toronto Region of Waterloo Intl Airport to Seattle was C$ 199 for a one-way ticket and C$ 314 for a round-trip.

  • Which aircraft models fly most regularly from Toronto Region of Waterloo Intl to Seattle?

    We unfortunately don’t have that data for this specific route.

  • How does KAYAK find such low prices on flights from Toronto Region of Waterloo Intl to Seattle?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Toronto Region of Waterloo Intl to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Toronto Region of Waterloo Intl to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Toronto Region of Waterloo Intl is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Toronto Region of Waterloo Intl to Seattle?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Toronto Region of Waterloo Intl with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Toronto Region of Waterloo Intl to Seattle?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Toronto Region of Waterloo Intl up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Region of Waterloo Intl to Seattle

 
See real verified KAYAK customer reviews for airlines flying from Toronto to Seattle. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Region of Waterloo Intl to Seattle? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.2
WestJetOverall score based on 3248 reviews
6.1Entertainment
7.9Crew
7.0Comfort
7.4Boarding
6.2Food
Airline reviews

Flight left on time. The crew was very friendly. I had to buy a proper meal. Small cookie and a drink just doesn’t cut it for a 4.5 hours flight.

8.0 ExcellentA.K, Jan 2026
YYZ - RTB
Read more WestJet reviews

Flight left on time. The crew was very friendly. I had to buy a proper meal. Small cookie and a drink just doesn’t cut it for a 4.5 hours flight.

Experience was good, the wifi hook up is somewhat tough

I will not be flying with westjet again. I was uncomfortable in my seat. The position made my back hurt so bad. My wife was able to fit the seatbelt around her with out an extension but was unable to put the tray table down or fit in the seat for that matter. Our bag was smashed and I spent two hours trying to fill out the application for a damaged bag before I gave up. The 80 photos I took would not work and nothing telling me the format to upload them as.. I made the mistake of unpacking the bag before taking photos so no claim for me. Next trip to Canada I will have to use air Canada.

They lost my bag. Hopefully it will be here tomorrow.

My luggage was damaged 1 wheel was out I can't find it nowhere

Took 3 hours to check in and drop off our suitcases. Half of the passengers were still in line by boarding time. The computer systems and staff were very slow. Staff were also disorganized and kept allowing later flights to skip lines. Suitcases were piling on that several other passengers didn't get their suitcases. Then, we were sitting in the plane for 2 hours and were told that the flight was overbooked. We missed our connecting flight and had to fly the following day but with a stop over. Good thing ONE WestJet customer rep was pleasant and actually knew how to do her job when we wanted to rebook to a direct flight. Thank you to Kim at Toronto airport. Terrible experience at PUJ. Won't go back to Dominican Republic.

Great seats, super comfortable, but no in flight entertainment which was a let down

Airplane is too small. Crew, especially the flight attendant who looked after our area, was not at all friendly and a touch authoratative. She may have been the most gruff flight attendant i've come across in 40 years of business travel

I when to Jamaica for my dad funeral and I did not get my luggage from westjet . I add to buy clothes putting me financial debt i did no want to be in Westjet did not call me to apologize are to inquire about my luggage I am still angry about it

Ground staff was not helpful, but staff at the business counter were excellent.

Everything you need to know for your flight from Region of Waterloo Intl to Seattle

Information on your arrival and departure airports