YKF - SEA

C$ 159 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 1/6. 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.
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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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Flights Deals

Cheap Flight Deals 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.

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

KAYAK's recommended round-trip deals from the most popular airlines that fly from Region of Waterloo Intl to Seattle.
Discover the best prices for you by selecting your travel dates on KAYAK.
WestJet Logo
6:00 a.m. - 12:58 p.m.YKF-SEA
9h 58m1 stop
WestJet Logo
2:05 p.m. - 12:46 a.m.SEA-YKF
7h 41m1 stop
C$ 278WestJet
Find Deal
Tue, 27 May - Tue, 3 Jun
WestJet Logo
6:00 a.m. - 12:58 p.m.YKF-SEA
9h 58m1 stop
WestJet Logo
1:50 p.m. - 12:46 a.m.SEA-YKF
7h 56m1 stop
C$ 298WestJet
Find Deal
Sun, 25 May - Wed, 4 Jun
WestJet Logo
6:00 a.m. - 6:38 p.m.YKF-SEA
15h 38m1 stop
WestJet Logo
1:50 p.m. - 12:46 a.m.SEA-YKF
7h 56m1 stop
C$ 310WestJet
Find Deal
Fri, 18 Jul - Sat, 26 Jul
WestJet Logo
6:00 a.m. - 12:58 p.m.YKF-SEA
9h 58m1 stop
WestJet Logo
7:05 a.m. - 12:46 a.m.SEA-YKF
14h 41m1 stop
C$ 316WestJet
Find Deal
Wed, 21 May - Tue, 27 May
WestJet Logo
6:00 a.m. - 12:58 p.m.YKF-SEA
9h 58m1 stop
WestJet Logo
8:25 a.m. - 12:46 a.m.SEA-YKF
13h 21m1 stop
C$ 324WestJet
Find Deal
Tue, 13 May - Wed, 21 May
WestJet Logo
6:00 a.m. - 12:58 p.m.YKF-SEA
9h 58m1 stop
WestJet Logo
1:50 p.m. - 12:46 a.m.SEA-YKF
7h 56m1 stop
C$ 328WestJet
Find Deal
Tue, 13 May - Wed, 14 May
WestJet Logo
6:00 a.m. - 12:58 p.m.YKF-SEA
9h 58m1 stop
WestJet Logo
7:05 a.m. - 6:56 p.m.SEA-YKF
8h 51m1 stop
C$ 336WestJet
Find Deal
Wed, 18 Jun - Tue, 24 Jun
WestJet Logo
6:00 a.m. - 8:28 p.m.YKF-SEA
17h 28m1 stop
WestJet Logo
1:50 p.m. - 12:46 a.m.SEA-YKF
7h 56m1 stop
C$ 343WestJet
Find Deal
Sat, 19 Jul - Sat, 2 Aug
 Logo
6:00 a.m. - 12:58 p.m.YKF-SEA
9h 58m1 stop
 Logo
3:20 p.m. - 12:46 a.m.SEA-YKF
30h 26m3 stops
C$ 439
Find Deal
Tue, 13 May - Wed, 21 May
 Logo
6:00 a.m. - 12:10 a.m.YKF-SEA
21h 10m2 stops
 Logo
1:50 p.m. - 12:46 a.m.SEA-YKF
7h 56m1 stop
C$ 478
Find Deal
Thu, 22 May - Sat, 31 May
Useful Info

Good to know

Low seasonMay
High seasonAugust
Cheapest flightC$ 159
Best time to beat the crowds (60% less expensive on average)
Most popular time to fly and prices are also 31% 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$ 115 for a one-way ticket and C$ 201 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 airline alliances offer flights from Toronto Region of Waterloo Intl to Seattle?

    Star Alliance is the only airline alliance operating flights between Toronto Region of Waterloo Intl and Seattle.

  • 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$ 345 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 7.0.

  • 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.

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 2826 reviews
6.2Food
7.4Boarding
7.9Crew
7.1Comfort
6.1Entertainment
Airline reviews

Internet on both flights was sketchy. Thus in flight entertainment was non- existent on MN - Balrimote leg.

10.0 ExcellentMary, Apr 2025YVR - MSP
Read more WestJet reviews

Internet on both flights was sketchy. Thus in flight entertainment was non- existent on MN - Balrimote leg.

We never had an experience they canceled the flight and they did not offer us an alternative flight. I had to book one on my own expense. They offered us food voucher and we could not use them at the airport it kept saying not attached to an existing flight. The people at the counter were rude and cold and they did not care about our situation

It took 30 minutes to check in with the Westjet rep. They didn’t have enough seats and she needed to make a call… I am always “randomly” selected to be checked at security. Their “randomly “ selection system may need some updating. They treat people like criminals. It is not appropriate behavior.

Found the seats very crowded—too close together ! And waited a long time for our luggage All staff at both ends were excellent!!!

Flight cancelled and Kayak switched our return flight to a red eye. Ridiculous.

Will never book through you again. Very disappointed in the notices and action taken or provided when planes are rescheduled, enough to cause missed connections

Lost my luggage. Filed a report and there is no response. Received a phone call from another airline that said they had the bag and they did not know what to do with it

Very good over all , would have been nice to have entertainment on the flight

Absolutely the worst airline I have ever taken. They lost my baggage and told me my bag tags had been cancelled. When my bags arrived days later I had to pick them up at 3:15 am. My return flight was delayed another 6 hours and they broke my bag. Westjet does nothing to try and make it a better customer experience and all the customers services representatives I spoke with were useless and incompetent. Never flying westjet again.

Easy self checkin and baggage drop. No in seat entertainment, but wifi and app worked well

My flight got delayed 5 times and then got cancelled eventually, I had to get a hotel and uber and pay for food for an extra night without any plans. It was a horrible experience, instead of Air Canada, I was flying with United .

I had a nice flight with free wifi. So I was able to message family members and stream music during my flight, which made the trip go by fast. I also enjoyed flying on there Airbus A220. The plane looked very new and it also got up to speed fast down the runway and didn't need much runway to get airborne.

Overall good experience. The flight from Toronto to Denver does not have entertainment - movies to watch.

Boarding was challenging as we had to use the stairs from the tarmac. Stairs are okay but a roller bag makes it challenging.

Ensure prepaid food arrangements are appropriately understood by flight crew of who purchased and who did not

All was fine. Weather was a bit stormy, but nothing kayak can do about that! 😊

I paid for a comfort class seat and was seated in economy.

My plane was cancelled and had to be rebook for the evening was not happy.

The flight was cancelled and we had to rebook on Porter to make our cruise the next day. Air Canada has not compensated. We won’t be flying with them again. This is the second time this has happened. Also the return flight was delayed 2 hours who knows why.

Separated me and my wife and wife’s sister in far apart different seats even though I booked them all together. Just scams after scams to make us pay more. Worst airline

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

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