HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Region of Waterloo Intl

$123+ Cheap flights from Seattle (SEA) to Region of Waterloo Intl (YKF)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/7. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YKF
Dec 10 — Dec 171
Wed 12/10
Wed 12/17
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to Region of Waterloo Intl with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Seattle to Region of Waterloo Intl

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Region of Waterloo Intl (YKF). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated November 10, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$276
(oojo)

One-way from

$123
(oojo)

Popular in

June

Cheapest in

February

Average price

$292
Provider with most accurate pricing for Seattle/Tacoma Intl-Toronto Region of Waterloo Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Toronto Region of Waterloo Intl flights.
Search Deals
From Seattle/Tacoma Intl to Toronto Region of Waterloo Intl
Search Deals
One-way flight from Seattle/Tacoma Intl to Toronto Region of Waterloo Intl
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($72 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

Find flight deals from Seattle to Region of Waterloo Intl

Cheapest flights from Seattle to Region of Waterloo Intl
Explore the most affordable flight options available from Seattle to Region of Waterloo Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 10, 2025.

This Mytrip deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/103:10 pmSEA - YKF
1 stop11h 18mMultiple Airlines
Sun 12/147:05 amYKF - SEA
1 stop10h 15mMultiple Airlines
Deal found 11/8$359
This FlightHub deal was found by Cheapflights users on 11/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/283:10 pmSEA - YKF
1 stop11h 18mWestJet
Mon 12/16:20 amYKF - SEA
1 stop11h 00mWestJet
Deal found 11/7$385
This Mytrip deal was found by Cheapflights users on 11/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/711:55 amSEA - YKF
2 stops14h 33mMultiple Airlines
Sun 12/147:05 amYKF - SEA
1 stop10h 15mMultiple Airlines
Deal found 11/7$427
This Mytrip deal was found by Cheapflights users on 11/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/53:10 pmSEA - YKF
1 stop11h 18mMultiple Airlines
Fri 12/127:05 amYKF - SEA
1 stop10h 15mMultiple Airlines
Deal found 11/7$441
This Mytrip deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/2811:55 amSEA - YKF
3 stops25h 05mMultiple Airlines
Mon 12/16:20 amYKF - SEA
1 stop11h 00mMultiple Airlines
Deal found 11/9$462
This Trip.com deal was found by Cheapflights users on 11/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/233:10 pmSEA - YKF
1 stop11h 18mWestJet
Mon 12/16:20 amYKF - SEA
1 stop11h 00mWestJet
Deal found 11/7$553
This FlightHub deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/103:10 pmSEA - YKF
1 stop11h 18mWestJet
Tue 12/166:20 amYKF - SEA
1 stop11h 00mWestJet
Deal found 11/8$575
This Mytrip deal was found by Cheapflights users on 11/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1211:55 amSEA - YKF
2 stops14h 33mWestJet
Tue 12/166:20 amYKF - SEA
1 stop11h 00mWestJet
Deal found 11/6$623

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Region of Waterloo Intl that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 10, 2025.
Use the filters below to find and compare flights from Seattle to Toronto Region of Waterloo Intl Airport that are best for you.

Fly from

Seattle

Fly to

Region of Waterloo Intl

Route

Depart

Return

Price

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 1/28

3:10 pm-5:28 am

1 stop11h 18m

Toronto Region of Waterloo Intl

Sat 1/31

7:00 pm-2:19 pm

1 stop22h 19m

$276

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 1/11

3:10 pm-5:28 am

1 stop11h 18m

Toronto Region of Waterloo Intl

Sat 1/17

7:00 pm-2:20 pm

1 stop22h 20m

$276

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 1/9

11:55 am-5:28 am

2 stops14h 33m

Toronto Region of Waterloo Intl

Mon 1/12

6:20 am-2:20 pm

1 stop11h 00m

$346

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 12/10

3:10 pm-5:28 am

1 stop11h 18m

Toronto Region of Waterloo Intl

Sun 12/14

7:05 am-2:20 pm

1 stop10h 15m

$359

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 1/7

3:10 pm-5:28 am

1 stop11h 18m

Toronto Region of Waterloo Intl

Sun 1/11

7:05 am-10:23 am

2 stops30h 18m

$385

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 11/28

3:10 pm-5:28 am

1 stop11h 18m

Toronto Region of Waterloo Intl

Mon 12/1

6:20 am-2:20 pm

1 stop11h 00m

$385

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 12/7

11:55 am-5:28 am

2 stops14h 33m

Toronto Region of Waterloo Intl

Sun 12/14

7:05 am-2:20 pm

1 stop10h 15m

$427

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 12/5

3:10 pm-5:28 am

1 stop11h 18m

Toronto Region of Waterloo Intl

Fri 12/12

7:05 am-2:20 pm

1 stop10h 15m

$441

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sun 2/1

11:55 am-5:29 am

2 stops14h 34m

Toronto Region of Waterloo Intl

Mon 2/9

6:20 am-2:19 pm

1 stop10h 59m

$454

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 1/7

3:10 pm-5:28 am

1 stop11h 18m

$123

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/9

Showing 1-10 of 14 results
1
2

Compare providers for flights from Seattle to Region of Waterloo Intl

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Region of Waterloo Intl in November.
ProviderPrice AccuracyTrust Score*
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
MytripPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Toronto Region of Waterloo Intl Airport flights, users find the pricing of Mytrip to be most consistent on Cheapflights vs. Mytrip Users can find the same prices on Seattle-Toronto Region of Waterloo Intl Airport flight deals on Cheapflights vs. Mytrip >95% of the time. Price accuracy is based on data collected from Seattle-Toronto Region of Waterloo Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Toronto Region of Waterloo Intl Airport flights, Cheapflights users trust Mytrip the most. Mytrip has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Toronto Region of Waterloo Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to Region of Waterloo Intl

Have a flexible travel schedule? Discover the best time to fly to Region of Waterloo Intl from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Toronto Region of Waterloo Intl Airport

What is the cheapest time of day to fly from SEA to YKF?

Find hourly flight availability from Seattle to Region of Waterloo Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 10, 2025.

One of the essential ways to save on airfare from Seattle to Toronto Region of Waterloo Intl Airport is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 54% on airfare.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Region of Waterloo Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Seattle to Toronto Region of Waterloo Intl?

    Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly out of when you book flights from Seattle to Toronto Region of Waterloo Intl. 0 airlines have flights from Seattle/Tacoma Intl to Toronto Region of Waterloo Intl on a regular basis. Booking flights from Seattle/Tacoma Intl to Toronto Region of Waterloo Intl should not be difficult; the airport handles an average of 0 outbound flights to Toronto Region of Waterloo Intl per day.

  • How long is the flight from Seattle to Toronto Region of Waterloo Intl Airport?

    Airlines like WestJet fly from Seattle to Toronto Region of Waterloo Intl Airport in about 11h 18m. The time it takes to get you to your destination can typically vary by up to . The distance between Seattle and Toronto Region of Waterloo Intl Airport is about 2024 mi.

  • Can I find deals for flights from Seattle to Region of Waterloo Intl that include hotel bookings?

    Yes. In addition to deals on Seattle to Region of Waterloo Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Region of Waterloo Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Region of Waterloo Intl.

  • Can I find deals for business class flights from Seattle to Region of Waterloo Intl?

    Yes. Cheapflights offers flight deals from Seattle to Region of Waterloo Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
Site
©2025 Cheapflights