YKF - SEA

C$ 213 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 22/10. 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

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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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

Thu, 13 Nov - Wed, 19 Nov
WestJet Logo
6:20 a.m. - 2:20 p.m.YKF-SEA
11h 00m1 stop
WestJet Logo
3:10 p.m. - 5:28 a.m.SEA-YKF
11h 18m1 stop
C$ 316WestJet
Find Deal
Thu, 13 Nov - Wed, 19 Nov
 Logo
7:05 a.m. - 2:20 p.m.YKF-SEA
10h 15m1 stop
 Logo
3:10 p.m. - 5:28 a.m.SEA-YKF
11h 18m1 stop
C$ 399
Find Deal
Sun, 12 Oct - Sun, 19 Oct
 Logo
6:15 a.m. - 12:35 p.m.YKF-SEA
9h 20m1 stop
 Logo
8:40 a.m. - 5:15 a.m.SEA-YKF
17h 35m1 stop
C$ 404
Find Deal
Thu, 13 Nov - Wed, 19 Nov
 Logo
7:05 a.m. - 2:20 p.m.YKF-SEA
10h 15m1 stop
 Logo
3:10 p.m. - 5:28 a.m.SEA-YKF
11h 18m1 stop
C$ 406
Find Deal
Thu, 13 Nov - Wed, 19 Nov
WestJet Logo
6:20 a.m. - 10:23 a.m.YKF-SEA
31h 03m2 stops
WestJet Logo
3:10 p.m. - 5:28 a.m.SEA-YKF
11h 18m1 stop
C$ 408WestJet
Find Deal
Thu, 13 Nov - Wed, 19 Nov
WestJet Logo
6:20 a.m. - 10:23 a.m.YKF-SEA
31h 03m2 stops
WestJet Logo
3:10 p.m. - 5:28 a.m.SEA-YKF
11h 18m1 stop
C$ 410WestJet
Find Deal
Sun, 12 Oct - Sat, 18 Oct
 Logo
6:15 a.m. - 12:35 p.m.YKF-SEA
9h 20m1 stop
 Logo
8:40 a.m. - 5:30 a.m.SEA-YKF
17h 50m2 stops
C$ 426
Find Deal
Mon, 20 Oct - Mon, 27 Oct
WestJet Logo
6:00 a.m. - 12:59 p.m.YKF-SEA
9h 59m1 stop
WestJet Logo
3:10 p.m. - 5:28 a.m.SEA-YKF
11h 18m1 stop
C$ 428WestJet
Find Deal
Mon, 3 Nov - Fri, 7 Nov
WestJet Logo
6:20 a.m. - 2:20 p.m.YKF-SEA
11h 00m1 stop
WestJet Logo
11:55 a.m. - 5:28 a.m.SEA-YKF
14h 33m2 stops
C$ 432WestJet
Find Deal
Sat, 25 Oct - Sun, 2 Nov
WestJet Logo
6:00 a.m. - 12:59 p.m.YKF-SEA
9h 59m1 stop
WestJet Logo
11:55 a.m. - 5:28 a.m.SEA-YKF
14h 33m2 stops
C$ 443WestJet
Find Deal

Everything you should know

Cheapest round-trip
C$ 316
WestJet
Thu 13/11Wed 19/11
YKF - SEA • 1 stop
Cheapest one-way flights
C$ 213
Multiple Airlines
Wed 22/10
YKF - SEA • 2 stops
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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!
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 – 87% 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$ 311.

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 41m.

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 14m.

Good to know

Low seasonMay
Cheapest flightC$ 213
Best time to beat the crowds (56% less expensive on average)
Most popular time to fly and prices are also 20% lower on average.
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$ 154 for a one-way ticket and C$ 228 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.

  • Which is the best airline for flights from Toronto to Seattle, WestJet or Air Canada?

    The two airlines most popular with KAYAK users for flights from Toronto to Seattle are WestJet and Air Canada. With an average price for the route of C$ 308 and an overall rating of 7.2, WestJet is the most popular choice. Air Canada is also a great choice for the route, with an average price of C$ 393 and an overall rating of 7.1.

  • 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 airlines 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 3091 reviews
7.9Crew
6.1Entertainment
7.4Boarding
7.1Comfort
6.2Food
Airline reviews

I like how spacious the plane was but I did not like the fact that there was no entertainment

6.0 GoodSexy, Aug 2025YYZ - KIN
Read more WestJet reviews

I like how spacious the plane was but I did not like the fact that there was no entertainment

No dogs! Can we have no dogs in the cabin? Why was there a yappy little dog behind me? Lucky I had ear plugs. Sorry for others without

In spite of purchasing premium, I felt it was perhaps the most uncomfortable seat I have flown in. The base was either broken or poorly made and had no support. Even placing pillows and blankets on the seat (1D aisle) didn’t help. It made for a long and mostly sleepless six hour flight. Crew also were very loudly talking to each other through the night making it very hard to sleep. It was purchased for the price, so I get the risk, but was not impressed.

Good value, minor delay due to waiting for inbound plane but they gave accurate information about wait time. Able to switch to a seat by my husband thanks to a kind flight attendant

Absolutely terrible, from the customer service to boarding the plane. On the phone, there was some mishaps with getting in my correct date and they did not help me retrieve a refund or any assistance. I’m gonna be reporting to all my followers and family around the region of Los Angeles to New York.

Arrival at Comox from, London,ON 6 hours later... No bueano

Generally good. However. The flight left 30 mins behind schedule with no reason given.

Flight delayed, missed my pick-up had to Uber, plus missed dinner and medication, so sad!

Nothing to like because my inbound flight was cancelled without notification by West Jet or third party, JustFly. I couldn’t take the inbound flight due to cancellation; therefore could not take the outbound flight back.

Not the greatest experience everything was pretty mediocre. My seat was by the washroom in the aisle and was not located well as everyone past each other people were right in my seat and space.

I liked the behaviour of the crew members.The flight was good.

Flight was fine and on time. But no entertainment system and little leg room.

I swear airplane seats keep getting smaller and smaller but everything else was great. Smooth sailing and we got in early.

No food to provide, they forgot that, in some cases, people stay at the airport for hours without food. Now, to provide them with food, they have to ask them to pay, because some don't have money. That way, they can't eat.

After a long flight from Tokyo, our connecting flight home was canceled due to “maintenance” while we were on our layover in Toronto. Very frustrating to close out our honeymoon, although I’m sure others had it even worse during last week’s strike. Air Canada staff at Pearson Airport are the one thing that kept me remotely at peace during this — they were very helpful and deserve a lot of props. But I would not fly Air Canada again.

Horrible flight cancelled had to buy another very expensive ticket

Air Canada marooned me in Canada with no way back home during my summer vacation. I had to buy a last minute flight ticket for over $500 to make it back home. I have their credit card and have flown them for years. Never again.

Flight was cancelled last minute. Had to scramble and purchase a $2000 flight through a separate airlines. Stuck in Toronto two extra days. Missed my first two days on a new job. Had to rent a car for an additional two days. Scrambled to fins a place to live those extra two days. Spent a ton of extra money and lost a lot of money, as well as made a poor impression at work. Difficult difficult difficult

Terrible, return flight was cancelled a night before the flight was scheduled to depart and I was notified by an email and an automated message on their phone line. I’ll never book Air Canada again

Biggest problem for me is that I am Star Alliance Gold and they were not able to give me access to to Maple Lounge because of some computer glitch . It was management by information system. She could clearly see my status and still would not give me access because the computer woudl not let her. She should have override that be attentive to a customer and figure rhat out later

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

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