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Cheap flights from Seattle to Toronto Region of Waterloo Intl Airport from C$ 200

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 26/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YKF
26 Feb — 5 Mar1
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 27 January 2026.

Sat 2/52:05 p.m.
SEA
-
YKF
1 stop7h 40m
WestJet
Sat 9/56:00 a.m.
YKF
-
SEA
1 stop10h 08m
WestJet
Deal found 24/1C$ 352
Fri 10/48:41 a.m.
SEA
-
YKF
2 stops17h 48m
Multiple Airlines
Thu 16/46:20 a.m.
YKF
-
SEA
1 stop10h 59m
Multiple Airlines
Deal found 27/1C$ 360
Wed 22/43:10 p.m.
SEA
-
YKF
1 stop11h 19m
WestJet
Mon 27/48:40 p.m.
YKF
-
SEA
1 stop16h 00m
WestJet
Deal found 27/1C$ 397
Thu 14/57:35 p.m.
SEA
-
YKF
1 stop21h 15m
WestJet
Mon 18/58:40 p.m.
YKF
-
SEA
1 stop16h 00m
WestJet
Deal found 26/1C$ 430
Wed 11/33:10 p.m.
SEA
-
YKF
1 stop11h 19m
WestJet
Tue 24/36:20 a.m.
YKF
-
SEA
1 stop10h 59m
WestJet
Deal found 24/1C$ 433
Tue 12/57:35 p.m.
SEA
-
YKF
1 stop21h 15m
WestJet
Sun 17/58:40 p.m.
YKF
-
SEA
1 stop16h 00m
WestJet
Deal found 25/1C$ 434
Wed 25/33:10 p.m.
SEA
-
YKF
1 stop11h 19m
Multiple Airlines
Fri 27/37:05 a.m.
YKF
-
SEA
1 stop10h 14m
Multiple Airlines
Deal found 27/1C$ 511
Mon 23/211:55 a.m.
SEA
-
YKF
2 stops14h 34m
WestJet
Mon 2/36:20 a.m.
YKF
-
SEA
1 stop10h 59m
WestJet
Deal found 26/1C$ 545
Thu 4/67:35 p.m.
SEA
-
YKF
1 stop21h 15m
WestJet
Mon 22/66:00 a.m.
YKF
-
SEA
1 stop17h 28m
WestJet
Deal found 26/1C$ 557

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 27 January 2026.

Round-trip from

C$ 352

One-way from

C$ 200

Popular in

June

Cheapest in

January

Average price

C$ 368
WestJet
  • WestJet
  • 2/5-9/5
  • 2 total stops
  • 17h 48m total
  • Seattle to Toronto
Search Deals
WestJet
  • WestJet
  • 16/3
  • 1 total stop
  • 11h 19m total
  • Seattle to Toronto
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (C$ 134 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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 27 January 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

Seattle

Fly to

Region of Waterloo Intl

Route

Depart

Return

Price

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sat 2/5

2:05 p.m.-12:45 a.m.

1 stop7h 40m

Toronto Region of Waterloo Intl

Sat 9/5

6:00 a.m.-1:08 p.m.

1 stop10h 08m

C$ 352

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sat 2/5

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

1 stop21h 15m

Toronto Region of Waterloo Intl

Sun 10/5

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

1 stop16h 00m

C$ 430

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

Mon 8/6

8:40 p.m.-6:45 p.m.

1 stop25h 05m

C$ 430

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Sat 23/5

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

1 stop21h 15m

Toronto Region of Waterloo Intl

Wed 27/5

8:40 p.m.-6:45 p.m.

1 stop25h 05m

C$ 430

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Thu 14/5

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

1 stop21h 15m

Toronto Region of Waterloo Intl

Mon 18/5

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

1 stop16h 00m

C$ 430

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 11/3

3:10 p.m.-5:29 a.m.

1 stop11h 19m

Toronto Region of Waterloo Intl

Tue 24/3

6:20 a.m.-2:19 p.m.

1 stop10h 59m

C$ 433

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Wed 25/3

3:10 p.m.-5:29 a.m.

1 stop11h 19m

Toronto Region of Waterloo Intl

Fri 27/3

7:05 a.m.-2:19 p.m.

1 stop10h 14m

C$ 511

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Mon 23/2

11:55 a.m.-5:29 a.m.

2 stops14h 34m

Toronto Region of Waterloo Intl

Mon 2/3

6:20 a.m.-2:19 p.m.

1 stop10h 59m

C$ 545

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

Mon 22/6

6:00 a.m.-8:28 p.m.

1 stop17h 28m

C$ 560

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Tue 26/5

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

1 stop21h 15m

C$ 200

Flights are sorted by cheapest round-trip flights first.

Deals found on 27/1

Showing 1-10 of 21 results
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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$ 352, WestJet can have you in Toronto Region of Waterloo Intl Airport from Seattle in 7h 40m. 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

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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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Bellingham to Pearson Intl flights

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

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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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