SEA - YKF

$56 Find Cheap Flights from Seattle to Toronto Region of Waterloo Intl

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Toronto departing on 6/16. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Toronto Region of Waterloo Intl Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Toronto, 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 Seattle to Toronto, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 22% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flights Deals
Useful Info
Flights Deals

Cheap Flights from Seattle to Region of Waterloo Intl

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Region of Waterloo Intl 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 Seattle to Toronto

KAYAK's recommended round-trip deals from the most popular airlines that fly from Seattle to Toronto.
Discover the best prices for you by selecting your travel dates on KAYAK.
WestJet Logo
1:50 pm - 12:46 amSEA-YKF
7h 56m1 stop
WestJet Logo
6:00 am - 4:40 pmYKF-SEA
13h 40m2 stops
$109WestJet
Find Deal
Thu, May 15 - Fri, May 16
WestJet Logo
10:25 am - 12:46 amSEA-YKF
11h 21m2 stops
WestJet Logo
6:00 am - 4:40 pmYKF-SEA
13h 40m2 stops
$127WestJet
Find Deal
Thu, May 15 - Fri, May 16
WestJet Logo
1:50 pm - 12:46 amSEA-YKF
7h 56m1 stop
WestJet Logo
6:00 am - 7:10 pmYKF-SEA
16h 10m1 stop
$132WestJet
Find Deal
Thu, May 15 - Fri, May 16
WestJet Logo
1:50 pm - 12:46 amSEA-YKF
7h 56m1 stop
WestJet Logo
6:00 am - 12:58 pmYKF-SEA
9h 58m1 stop
$240WestJet
Find Deal
Thu, Jul 24 - Sun, Jul 27
WestJet Logo
1:50 pm - 12:46 amSEA-YKF
7h 56m1 stop
WestJet Logo
6:00 am - 12:58 pmYKF-SEA
9h 58m1 stop
$246WestJet
Find Deal
Thu, May 29 - Wed, Jun 4
WestJet Logo
1:50 pm - 12:46 amSEA-YKF
7h 56m1 stop
WestJet Logo
6:00 am - 8:28 pmYKF-SEA
17h 28m1 stop
$258WestJet
Find Deal
Wed, Jul 16 - Sun, Jul 20
WestJet Logo
1:50 pm - 12:46 amSEA-YKF
7h 56m1 stop
WestJet Logo
6:00 am - 12:58 pmYKF-SEA
9h 58m1 stop
$260WestJet
Find Deal
Sat, Aug 2 - Sun, Aug 10
WestJet Logo
8:25 am - 12:46 amSEA-YKF
13h 21m1 stop
WestJet Logo
6:00 am - 12:58 pmYKF-SEA
9h 58m1 stop
$267WestJet
Find Deal
Wed, May 28 - Sun, Jun 1
Logo
7:05 am - 5:30 amSEA-YKF
19h 25m2 stops
Logo
6:00 am - 12:58 pmYKF-SEA
9h 58m1 stop
$301
Find Deal
Wed, Jun 11 - Wed, Jun 18
Logo
3:20 pm - 12:46 amSEA-YKF
30h 26m3 stops
Logo
6:00 am - 12:58 pmYKF-SEA
9h 58m1 stop
$335
Find Deal
Wed, Jun 11 - Wed, Jun 18
Useful Info

KAYAK's insights & trends for Seattle to Toronto flights

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

What’s the cheapest day of the week to fly from Seattle to Toronto Region of Waterloo Intl?

The average price of all round-trip flights from Seattle to Toronto Region of Waterloo Intl Airport clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to Toronto Region of Waterloo Intl on a Wednesday, as we generally find the cheapest rates on that day for this route. On the other hand, Thursday is the most expensive day to fly from Seattle to Toronto Region of Waterloo Intl. For your return ticket, we recommend flying on a Tuesday and avoiding Fridays for the best deals.

Find deals

Good to know

Cheapest flight$56
Flight from Seattle to Toronto Region of Waterloo Intl

When to book flights from Seattle to Toronto

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

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

    In the last 3 days, the lowest price for a flight from Seattle to Toronto Region of Waterloo Intl Airport was $56 for a one-way ticket and $109 for a round-trip.

  • Do I need a passport to fly between Seattle and Toronto Region of Waterloo Intl?

    Yes

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

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

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

    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 Seattle to Toronto Region of Waterloo Intl.

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

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

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

    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 Toronto Region of Waterloo Intl with an airline and back to Seattle with another airline. Booking your flights between Seattle and YKF can sometimes prove cheaper using this method.

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

    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 Toronto Region of Waterloo Intl from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top airline flying from Seattle to Toronto

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Toronto. 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 Seattle to Toronto? 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
7.1Comfort
7.9Crew
6.1Entertainment
7.4Boarding
Airline reviews

The staff were the friendliest I have encountered in years. Absolutely great!

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

The staff were the friendliest I have encountered in years. Absolutely great!

Plane changed to one with no entertainment system or ability to serve hot meals

Flight was delayed 3 times. Then cancelled due to pilot being timed out. They refused hotel vouchers. Gate attendants were very rude and could not help you at all.

No access to any entertainment No food other than a cookie or pretzels even tho flight was over the supper hour Seats very close together and very little leg room Staff was very good

Good. Would be better if the carry on baggage was free.

Horrible. I checked out myself that it seems that I can have a free carry-on. But they ask me to pay $75 when we are nearly boarding. It was tricky during check out that make you mistake that you can have a carry-on beside your personal item. Also they ask $75 in the airport instead of $35 during checkout. So the whole process is designed to make you this mistake

Westjet is one of the worst airlines in the world. 100% guaranteed to have flight delays and flight cancellations. Will never book again with Westjet.

The cancelation of my flight from Toronto to Edmonton without any solution given to me for my next flight. Very poor connection from Toronto to Edmonton

Too squished in seats. I'm 110 lbs and 5'6....can't imagine being any bigger and flying

Scrooge airlines spoiled my last chance at Christmas with my 95 and 92 year old folks. and rest of the family in Calgary. Ticket personnel would not let me on without a passport and I always visit Canada with my enhanced driver;s License when I travel from the US

Everything you need to know for your flight from Seattle to Toronto

Information on your arrival and departure airports

Region of Waterloo Intl (YKF)
Seattle (SEA)

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.