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

Departing from Toronto Region of Waterloo Intl Airport to Seattle will take you 16h. The distance between Toronto Region of Waterloo Intl Airport and Seattle is about 3257 km.

In terms of precipitation, rainfall in Seattle ranges from 18.0 - 168.0 mm per month. November is typically the wettest month, when rainfall can reach 168.0 mm. July is typically the driest time to visit Seattle when rainfall is around 18.0 mm.

If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 19.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 5.0 C).

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

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Toronto Region of Waterloo Intl Airport to Seattle as you normally would.

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

Seattle/Tacoma Intl (SEA) is the airport you will fly into if you book a flight from Toronto Region of Waterloo Intl to Seattle. You should not have trouble finding flights to Seattle/Tacoma Intl from Toronto Region of Waterloo Intl; the airport handles an average of 0 inbound flights from Toronto Region of Waterloo Intl per day. You should also have plenty of airline options to choose from since 0 airlines have flights to the Seattle airport from Toronto Region of Waterloo Intl. It is only a 18.4 km journey from Seattle/Tacoma Intl (SEA) to Seattle’s city centre.

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

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

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

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

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

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

C$ 330+ Cheap Flights from Toronto Region of Waterloo Intl Airport to Seattle

Cheap flight deals from Region of Waterloo Intl to Seattle

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

Cheapest flights from Region of Waterloo Intl to Seattle
Explore the most affordable flight options available from Region of Waterloo Intl to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 10 September 2026.

Fri 25/98:40 p.m. -

1 stop16h 00m

Tue 29/97:35 p.m. -

1 stop21h 15m

Deal found 6/9C$ 475

Sat 19/98:40 p.m. -

1 stop16h 00m

Sat 26/97:35 p.m. -

1 stop21h 15m

Deal found 6/9C$ 477

Tue 29/98:40 p.m. -

1 stop16h 00m

Sat 3/107:35 p.m. -

1 stop21h 15m

Deal found 10/9C$ 479

Fri 16/108:40 p.m. -

1 stop16h 00m

Tue 20/107:35 p.m. -

1 stop21h 15m

Deal found 9/9C$ 482

Tue 22/98:40 p.m. -

1 stop16h 00m

Sat 26/97:35 p.m. -

1 stop21h 15m

Deal found 8/9C$ 496

Thu 1/108:40 p.m. -

1 stop25h 05m

Wed 7/107:35 p.m. -

1 stop16h 25m

Deal found 6/9C$ 579

Thu 15/106:05 a.m. -

1 stop15h 40m

Tue 20/107:35 p.m. -

1 stop21h 15m

Deal found 6/9C$ 596

Mon 21/98:40 p.m. -

1 stop25h 05m

Mon 28/97:35 p.m. -

1 stop21h 15m

Deal found 8/9C$ 609

Fri 9/108:40 p.m. -

1 stop25h 05m

Tue 13/107:35 p.m. -

1 stop21h 15m

Deal found 8/9C$ 673

Tue 15/98:40 p.m. -

1 stop25h 05m

Tue 22/97:35 p.m. -

1 stop21h 15m

Deal found 8/9C$ 674

Find flight deals from Region of Waterloo Intl to Seattle

Round-trip from	C$ 475
One-way from	C$ 330
Popular in	June
Cheapest in	February
Average price	C$ 561

WestJet
25/9-29/9
2 total stops
37h 15m total
Toronto to Seattle

Search Deals

17/10-31/12
3 total stops
26h 40m total
Toronto to Seattle

Search Deals

Highest demand for flights based on searches. 12% potential increase in price (C$ 99 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 September 2026

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from Toronto Region of Waterloo Intl Airport to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

TorontoSeattle

YKF Toronto Region of Waterloo Intl - SEA Seattle/Tacoma Intl

YKFSEA

Toronto Region of Waterloo Intl

Mon 5/10

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

1 stop25h 05m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 365

TorontoSeattle

YKF Toronto Region of Waterloo Intl - SEA Seattle/Tacoma Intl

YKFSEA

Toronto Region of Waterloo Intl

Sat 17/10

7:05 p.m.-9:40 a.m.

2 stops41h 35m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 385

TorontoSeattle

YKF Toronto Region of Waterloo Intl - SEA Seattle/Tacoma Intl

YKFSEA

Toronto Region of Waterloo Intl

Tue 22/9

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

1 stop16h 00m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 399

Quickest round-trip

TorontoSeattle

YKF Toronto Region of Waterloo Intl - SEA Seattle/Tacoma Intl

YKFSEA

Toronto Region of Waterloo Intl

Sun 25/10

6:05 a.m.-2:40 p.m.

1 stop11h 35m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 420

TorontoSeattle

YKF Toronto Region of Waterloo Intl - SEA Seattle/Tacoma Intl

YKFSEA

Toronto Region of Waterloo Intl

Fri 16/10

7:05 p.m.-6:45 p.m.

2 stops26h 40m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 428

TorontoSeattle

YKF Toronto Region of Waterloo Intl - SEA Seattle/Tacoma Intl

YKFSEA

Toronto Region of Waterloo Intl

Wed 14/10

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

1 stop25h 05m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 439

TorontoSeattle

YKF Toronto Region of Waterloo Intl - SEA Seattle/Tacoma Intl

YKFSEA

Toronto Region of Waterloo Intl

Fri 9/10

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

1 stop25h 05m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 449

TorontoSeattle

YKF Toronto Region of Waterloo Intl - SEA Seattle/Tacoma Intl

YKFSEA

Toronto Region of Waterloo Intl

Tue 29/9

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

1 stop16h 00m

Seattle/Tacoma Intl

Sat 3/10

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

1 stop21h 15m

C$ 479

TorontoSeattle

YKF Toronto Region of Waterloo Intl - SEA Seattle/Tacoma Intl

YKFSEA

Toronto Region of Waterloo Intl

Wed 7/10

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

1 stop16h 00m

Seattle/Tacoma Intl

Wed 31/12

12:00 a.m.-3:00 a.m.

Nonstop0h 00m

C$ 482

TorontoSeattle

YKF Toronto Region of Waterloo Intl - SEA Seattle/Tacoma Intl

YKFSEA

Toronto Region of Waterloo Intl

Tue 22/9

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

1 stop16h 00m

Seattle/Tacoma Intl

Mon 28/9

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

1 stop21h 15m

C$ 496

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/9

Showing 1-10 of 19 resultsSorted by cheapest first

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

Have a flexible travel schedule? Discover the best time to fly to Seattle from Region of Waterloo Intl with our price prediction graph.

YKF-SEA

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

What airport do you fly into for flights to Seattle from Toronto Region of Waterloo Intl?
Seattle/Tacoma Intl (SEA) is the airport you will fly into if you book a flight from Toronto Region of Waterloo Intl to Seattle. You should not have trouble finding flights to Seattle/Tacoma Intl from Toronto Region of Waterloo Intl; the airport handles an average of 0 inbound flights from Toronto Region of Waterloo Intl per day. You should also have plenty of airline options to choose from since 0 airlines have flights to the Seattle airport from Toronto Region of Waterloo Intl. It is only a 18.4 km journey from Seattle/Tacoma Intl (SEA) to Seattle’s city centre.
How long is the flight from Toronto Region of Waterloo Intl Airport to Seattle?
Departing from Toronto Region of Waterloo Intl Airport to Seattle will take you 16h. The distance between Toronto Region of Waterloo Intl Airport and Seattle is about 3257 km.
Can I find deals for flights from Region of Waterloo Intl to Seattle that include hotel bookings?
Yes. In addition to deals on Region of Waterloo Intl to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Region of Waterloo Intl to Seattle?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Region of Waterloo Intl to Seattle.
Can I find deals for business class flights from Region of Waterloo Intl to Seattle?
Yes. Cheapflights offers flight deals from Region of Waterloo Intl to Seattle 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

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Deals for Region of Waterloo Intl to Seattle flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

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It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Region of Waterloo Intl to Seattle.

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

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Cheap flights from Toronto Region of Waterloo Intl Airport to Seattle from C$ 330

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 17/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Region of Waterloo Intl to Seattle

Cheapest flights from Region of Waterloo Intl to SeattleExplore the most affordable flight options available from Region of Waterloo Intl to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 10 September 2026.

Explore the most affordable flight options available from Region of Waterloo Intl to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 10 September 2026.

Best flights from Region of Waterloo Intl to SeattleDiscover carefully curated flight deals from Region of Waterloo Intl to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 10 September 2026.

Discover carefully curated flight deals from Region of Waterloo Intl to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 10 September 2026.

Last-minute flights from Region of Waterloo Intl to SeattleDiscover last-minute flight deals from Region of Waterloo Intl to Seattle. Data last updated 10 September 2026 and is based on user searches.

Discover last-minute flight deals from Region of Waterloo Intl to Seattle. Data last updated 10 September 2026 and is based on user searches.

One-way flights from Region of Waterloo Intl to SeattleSearch for one-way flight options from Region of Waterloo Intl to Seattle. Find affordable one-way fares based on user searches. Data last updated 10 September 2026.

Search for one-way flight options from Region of Waterloo Intl to Seattle. Find affordable one-way fares based on user searches. Data last updated 10 September 2026.

Find flight deals from Region of Waterloo Intl to Seattle

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Use the filters below to find and compare flights from Toronto Region of Waterloo Intl Airport to Seattle that are best for you.

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

Have a flexible travel schedule? Discover the best time to fly to Seattle from Region of Waterloo Intl with our price prediction graph.

Related info for your journey

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

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

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

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

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

Travelling to a place near Seattle?

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Alternative routes for Region of Waterloo Intl to Seattle

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Complete your trip

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Direct flights to Washington

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Region of Waterloo Intl and Seattle flights

Browse other Region of Waterloo Intl and Seattle flight options. Last updated on 10 September 2026.

Other flights from Region of Waterloo Intl

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Cheapest flights from Region of Waterloo Intl to Seattle
Explore the most affordable flight options available from Region of Waterloo Intl to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 10 September 2026.

Best flights from Region of Waterloo Intl to Seattle
Discover carefully curated flight deals from Region of Waterloo Intl to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 10 September 2026.

Last-minute flights from Region of Waterloo Intl to Seattle
Discover last-minute flight deals from Region of Waterloo Intl to Seattle. Data last updated 10 September 2026 and is based on user searches.

One-way flights from Region of Waterloo Intl to Seattle
Search for one-way flight options from Region of Waterloo Intl to Seattle. Find affordable one-way fares based on user searches. Data last updated 10 September 2026.