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Cheap flights from Seattle to Toronto Region of Waterloo Intl Airport from C$ 202

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 19/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YKF
28 May — 4 Jun1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Seattle to Region of Waterloo Intl

Enter your travel dates to find the best prices.

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 28 April 2026.

Thu 18/67:00 a.m.
SEA
-
YKF
1 stop9h 50m
WestJet
Tue 23/68:40 p.m.
YKF
-
SEA
1 stop16h 00m
WestJet
Deal found 28/4C$ 439
Mon 8/67:35 p.m.
SEA
-
YKF
1 stop21h 15m
WestJet
Fri 12/68:40 p.m.
YKF
-
SEA
1 stop16h 00m
WestJet
Deal found 24/4C$ 443
Thu 18/67:00 a.m.
SEA
-
YKF
1 stop9h 50m
WestJet
Mon 29/68:40 p.m.
YKF
-
SEA
1 stop16h 00m
WestJet
Deal found 27/4C$ 444
Thu 18/67:00 a.m.
SEA
-
YKF
1 stop9h 50m
WestJet
Fri 19/68:40 p.m.
YKF
-
SEA
1 stop16h 00m
WestJet
Deal found 25/4C$ 448
Thu 11/67:35 p.m.
SEA
-
YKF
1 stop21h 15m
WestJet
Sun 14/68:40 p.m.
YKF
-
SEA
1 stop25h 05m
WestJet
Deal found 23/4C$ 450
Fri 19/67:35 p.m.
SEA
-
YKF
1 stop21h 15m
WestJet
Sun 28/68:40 p.m.
YKF
-
SEA
1 stop16h 00m
WestJet
Deal found 26/4C$ 453
Thu 14/57:35 p.m.
SEA
-
YKF
1 stop21h 15m
WestJet
Sun 17/58:40 p.m.
YKF
-
SEA
1 stop16h 00m
WestJet
Deal found 26/4C$ 462
Sat 6/67:35 p.m.
SEA
-
YKF
1 stop21h 15m
WestJet
Sat 13/68:40 p.m.
YKF
-
SEA
1 stop25h 05m
WestJet
Deal found 23/4C$ 463
Fri 12/67:35 p.m.
SEA
-
YKF
1 stop21h 15m
WestJet
Sun 21/68:40 p.m.
YKF
-
SEA
1 stop16h 00m
WestJet
Deal found 28/4C$ 466
Fri 5/67:35 p.m.
SEA
-
YKF
1 stop21h 15m
WestJet
Sun 7/68:40 p.m.
YKF
-
SEA
1 stop16h 00m
WestJet
Deal found 23/4C$ 473
Wed 24/67:35 p.m.
SEA
-
YKF
1 stop21h 15m
WestJet
Sun 28/68:40 p.m.
YKF
-
SEA
1 stop16h 00m
WestJet
Deal found 23/4C$ 483

Find 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 28 April 2026.

Round-trip from

C$ 439

One-way from

C$ 202

Popular in

June

Cheapest in

January

Average price

C$ 517
WestJet
  • WestJet
  • 18/6-23/6
  • 2 total stops
  • 25h 50m total
  • Seattle to Toronto
Search Deals
WestJet
  • WestJet
  • 19/5
  • 1 total stop
  • 21h 15m total
  • Seattle to Toronto
Search Deals
Highest demand for flights based on searches. 17% potential increase in price (C$ 149 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

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 629,999 searches. Data last updated 28 April 2026.
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

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 18/6

7:00 a.m.-7:50 p.m.

1 stop9h 50m

Toronto Region of Waterloo Intl

Tue 23/6

8:40 p.m.-9:40 a.m.

1 stop16h 00m

C$ 439

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 18/6

7:00 a.m.-7:50 p.m.

1 stop9h 50m

Toronto Region of Waterloo Intl

Mon 29/6

8:40 p.m.-9:40 a.m.

1 stop16h 00m

C$ 444

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 4/6

7:35 p.m.-7:50 p.m.

1 stop21h 15m

Toronto Region of Waterloo Intl

Sun 7/6

8:40 p.m.-9:40 a.m.

1 stop16h 00m

C$ 465

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 12/6

7:35 p.m.-7:50 p.m.

1 stop21h 15m

Toronto Region of Waterloo Intl

Fri 19/6

8:40 p.m.-9:40 a.m.

1 stop16h 00m

C$ 465

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 5/6

7:35 p.m.-7:50 p.m.

1 stop21h 15m

Toronto Region of Waterloo Intl

Sun 7/6

8:40 p.m.-9:40 a.m.

1 stop16h 00m

C$ 473

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 12/6

7:35 p.m.-7:50 p.m.

1 stop21h 15m

Toronto Region of Waterloo Intl

Wed 17/6

8:40 p.m.-9:40 a.m.

1 stop16h 00m

C$ 473

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 11/6

7:35 p.m.-7:50 p.m.

1 stop21h 15m

Toronto Region of Waterloo Intl

Thu 18/6

8:40 p.m.-9:00 p.m.

1 stop27h 20m

C$ 485

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 24/6

7:00 a.m.-7:50 p.m.

1 stop9h 50m

Toronto Region of Waterloo Intl

Sun 28/6

8:40 p.m.-9:40 a.m.

1 stop16h 00m

C$ 503

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 19/6

7:35 p.m.-7:50 p.m.

1 stop21h 15m

Toronto Region of Waterloo Intl

Sun 28/6

8:40 p.m.-9:00 p.m.

1 stop27h 20m

C$ 521

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Fri 21/8

7:00 a.m.-7:50 p.m.

1 stop9h 50m

Toronto Region of Waterloo Intl

Mon 24/8

8:40 p.m.-9:40 a.m.

1 stop16h 00m

C$ 538

Flights are sorted by cheapest round-trip flights first.

Deals found on 23/4

Showing 1-10 of 23 resultsSorted by cheapest first
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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.

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?

    Most people fly from Seattle/Tacoma Intl (SEA) if they book a flight from Seattle to Toronto Region of Waterloo Intl. On average, Seattle/Tacoma Intl has 0 outbound flights to Toronto Region of Waterloo Intl per day from 0 airlines. Seattle/Tacoma Intl is conveniently located just 18.4 km from Seattle’s city centre.

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

    For as low as C$ 439, WestJet can have you in Toronto Region of Waterloo Intl Airport from Seattle in 9h 50m. Seattle and Toronto Region of Waterloo Intl Airport are separated by a distance of 3257 km.

  • 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

Travelling to a place near Toronto Region of Waterloo Intl Airport?

Book flights to Toronto Region of Waterloo Intl Airport if you plan to visit one of these locations
Southampton
Sauble Beach

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Seattle to Region of Waterloo Intl

See prices for flight routes from nearby airports that may be better suited for you.
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Seattle to Hamilton flights
Portland to Pearson Intl flights
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Fly with Cheapflights

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How does Cheapflights help users find flights from Seattle to Region of Waterloo Intl?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Seattle to Region of Waterloo Intl. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Region of Waterloo Intl?

Millions of users choose and trust Cheapflights to book the best flight deals from Seattle to Region of Waterloo Intl for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Seattle to Region of Waterloo Intl with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Seattle to Region of Waterloo Intl, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Seattle to Region of Waterloo Intl become cheaper?

Yes! Start tracking prices for Seattle to Region of Waterloo Intl flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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