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Cheap flights from Toronto Island Airport to Seattle from C$ 309

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Toronto Island Airport to Seattle departing on 3/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Toronto Island Airport to Seattle

Cheap round-trip flights

Enter your travel dates to find the best prices.
Air Canada Logo
8:55 p.m. - 10:05 a.m.YTZ  Toronto Island-SEA Seattle/Tacoma Intl
16h 10m2 stops Ottawa Vancouver Intl
Air Canada Logo
7:15 p.m. - 10:55 a.m.SEA  Seattle/Tacoma Intl-YTZ Toronto Island
12h 40m2 stops Vancouver Intl Ottawa
C$ 586Air Canada
Mon, 21 Sep - Mon, 28 Sep
Air Canada Logo
3:35 p.m. - 10:47 p.m.YTZ  Toronto Island-SEA Seattle/Tacoma Intl
10h 12m2 stops Ottawa Vancouver Intl
Air Canada Logo
7:15 p.m. - 10:55 a.m.SEA  Seattle/Tacoma Intl-YTZ Toronto Island
12h 40m2 stops Vancouver Intl Ottawa
C$ 589Air Canada
Sat, 12 Sep - Sat, 19 Sep
Air Canada Logo
9:30 a.m. - 10:42 p.m.YTZ  Toronto Island-SEA Seattle/Tacoma Intl
16h 12m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl
Air Canada Logo
5:50 a.m. - 6:20 p.m.SEA  Seattle/Tacoma Intl-YTZ Toronto Island
9h 30m2 stops Vancouver Intl Ottawa
C$ 611Air Canada
Sun, 6 Sep - Sat, 12 Sep
Air Canada Logo
10:45 a.m. - 10:42 p.m.YTZ  Toronto Island-SEA Seattle/Tacoma Intl
14h 57m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl
Air Canada Logo
5:40 a.m. - 9:30 p.m.SEA  Seattle/Tacoma Intl-YTZ Toronto Island
12h 50m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl
C$ 625Air Canada
Thu, 1 Oct - Sat, 3 Oct
Air Canada Logo
10:45 a.m. - 10:42 p.m.YTZ  Toronto Island-SEA Seattle/Tacoma Intl
14h 57m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl
Air Canada Logo
5:40 a.m. - 9:30 p.m.SEA  Seattle/Tacoma Intl-YTZ Toronto Island
12h 50m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl
C$ 626Air Canada
Thu, 1 Oct - Sat, 3 Oct
Air Canada Logo
8:55 p.m. - 10:05 a.m.YTZ  Toronto Island-SEA Seattle/Tacoma Intl
16h 10m2 stops Ottawa Vancouver Intl
Air Canada Logo
7:15 p.m. - 10:55 a.m.SEA  Seattle/Tacoma Intl-YTZ Toronto Island
12h 40m2 stops Vancouver Intl Ottawa
C$ 658Air Canada
Fri, 11 Sep - Sat, 19 Sep
United Airlines Logo
7:35 p.m. - 9:35 a.m.YTZ  Toronto Island-SEA Seattle/Tacoma Intl
17h 00m1 stop Chicago O'Hare Intl
United Airlines Logo
11:04 p.m. - 7:11 p.m.SEA  Seattle/Tacoma Intl-YTZ Toronto Island
17h 07m1 stop Washington, D.C. Dulles Intl
C$ 663United Airlines
Sat, 29 Aug - Sat, 5 Sep
United Airlines Logo
12:15 p.m. - 6:52 p.m.YTZ  Toronto Island-SEA Seattle/Tacoma Intl
9h 37m1 stop Chicago O'Hare Intl
United Airlines Logo
11:13 p.m. - 10:07 a.m.SEA  Seattle/Tacoma Intl-YTZ Toronto Island
7h 54m1 stop Chicago O'Hare Intl
C$ 670United Airlines
Thu, 1 Oct - Sat, 3 Oct
United Airlines Logo
12:15 p.m. - 6:52 p.m.YTZ  Toronto Island-SEA Seattle/Tacoma Intl
9h 37m1 stop Chicago O'Hare Intl
United Airlines Logo
1:22 p.m. - 10:07 a.m.SEA  Seattle/Tacoma Intl-YTZ Toronto Island
17h 45m2 stops San Francisco Chicago O'Hare Intl
C$ 671United Airlines
Thu, 1 Oct - Sat, 3 Oct
United Airlines Logo
12:15 p.m. - 7:07 p.m.YTZ  Toronto Island-SEA Seattle/Tacoma Intl
9h 52m1 stop Chicago O'Hare Intl
United Airlines Logo
11:13 p.m. - 10:07 a.m.SEA  Seattle/Tacoma Intl-YTZ Toronto Island
7h 54m1 stop Chicago O'Hare Intl
C$ 672United Airlines
Sat, 29 Aug - Wed, 7 Oct

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United Airlines flights from Toronto Island Airport to Seattle

Our best United Airlines deals on Toronto Island Airport to Seattle flight tickets
United Airlines
22 Sep
YTZ12:15 p.m.Toronto Island
10h 00m
1 stop
SEA7:15 p.m.Seattle/Tacoma Intl
29 Sep
SEA11:13 p.m.Seattle/Tacoma Intl
7h 54m
1 stop
YTZ10:07 a.m.Toronto Island
C$ 663
United Airlines
1 Oct
YTZ12:15 p.m.Toronto Island
9h 37m
1 stop
SEA6:52 p.m.Seattle/Tacoma Intl
3 Oct
SEA1:22 p.m.Seattle/Tacoma Intl
17h 45m
2 stops
YTZ10:07 a.m.Toronto Island
C$ 670
United Airlines
1 Oct
YTZ12:15 p.m.Toronto Island
9h 37m
1 stop
SEA6:52 p.m.Seattle/Tacoma Intl
3 Oct
SEA1:22 p.m.Seattle/Tacoma Intl
17h 45m
2 stops
YTZ10:07 a.m.Toronto Island
C$ 671

Air Canada flights from Toronto Island Airport to Seattle

Our best Air Canada deals on Toronto Island Airport to Seattle flight tickets
Air Canada
21 Sep
YTZ8:55 p.m.Toronto Island
16h 10m
2 stops
SEA10:05 a.m.Seattle/Tacoma Intl
28 Sep
SEA7:15 p.m.Seattle/Tacoma Intl
12h 40m
2 stops
YTZ10:55 a.m.Toronto Island
C$ 586
Air Canada
12 Sep
YTZ3:35 p.m.Toronto Island
10h 12m
2 stops
SEA10:47 p.m.Seattle/Tacoma Intl
19 Sep
SEA7:15 p.m.Seattle/Tacoma Intl
12h 40m
2 stops
YTZ10:55 a.m.Toronto Island
C$ 589
Air Canada
6 Sep
YTZ9:30 a.m.Toronto Island
16h 12m
2 stops
SEA10:42 p.m.Seattle/Tacoma Intl
12 Sep
SEA5:50 a.m.Seattle/Tacoma Intl
9h 30m
2 stops
YTZ6:20 p.m.Toronto Island
C$ 611

momondo Fare Finder

 
Customize your flight search to find flights from Toronto Island Airport to Seattle 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, momondo users made 96,600 searches. Data last updated 8 August 2026.
Use the filters below to find and compare flights from Toronto Island Airport to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

TorontoSeattle

YTZ Toronto Island - SEA Seattle/Tacoma Intl

YTZSEA

Toronto Island

Mon 21/9

8:55 p.m.-10:05 a.m.

2 stops16h 10m

Seattle/Tacoma Intl

Mon 28/9

7:15 p.m.-10:55 a.m.

2 stops12h 40m

C$ 586

TorontoSeattle

YTZ Toronto Island - SEA Seattle/Tacoma Intl

YTZSEA

Toronto Island

Sat 12/9

3:35 p.m.-10:47 p.m.

2 stops10h 12m

Seattle/Tacoma Intl

Sat 19/9

7:15 p.m.-10:55 a.m.

2 stops12h 40m

C$ 589

TorontoSeattle

YTZ Toronto Island - SEA Seattle/Tacoma Intl

YTZSEA

Toronto Island

Sun 6/9

9:30 a.m.-10:42 p.m.

2 stops16h 12m

Seattle/Tacoma Intl

Sat 12/9

5:50 a.m.-6:20 p.m.

2 stops9h 30m

C$ 611

TorontoSeattle

YTZ Toronto Island - SEA Seattle/Tacoma Intl

YTZSEA

Toronto Island

Thu 1/10

10:45 a.m.-10:42 p.m.

2 stops14h 57m

Seattle/Tacoma Intl

Sat 3/10

5:40 a.m.-9:30 p.m.

2 stops12h 50m

C$ 625

TorontoSeattle

YTZ Toronto Island - SEA Seattle/Tacoma Intl

YTZSEA

Toronto Island

Thu 1/10

10:45 a.m.-10:42 p.m.

2 stops14h 57m

Seattle/Tacoma Intl

Sat 3/10

5:40 a.m.-9:30 p.m.

2 stops12h 50m

C$ 626

TorontoSeattle

YTZ Toronto Island - SEA Seattle/Tacoma Intl

YTZSEA

Toronto Island

Fri 11/9

8:55 p.m.-10:05 a.m.

2 stops16h 10m

Seattle/Tacoma Intl

Sat 19/9

7:15 p.m.-10:55 a.m.

2 stops12h 40m

C$ 658

TorontoSeattle

YTZ Toronto Island - SEA Seattle/Tacoma Intl

YTZSEA

Toronto Island

Sat 29/8

7:35 p.m.-9:35 a.m.

1 stop17h 00m

Seattle/Tacoma Intl

Sat 5/9

11:04 p.m.-7:11 p.m.

1 stop17h 07m

C$ 663
Quickest round-trip

TorontoSeattle

YTZ Toronto Island - SEA Seattle/Tacoma Intl

YTZSEA

Toronto Island

Thu 1/10

12:15 p.m.-6:52 p.m.

1 stop9h 37m

Seattle/Tacoma Intl

Sat 3/10

11:13 p.m.-10:07 a.m.

1 stop7h 54m

C$ 670

TorontoSeattle

YTZ Toronto Island - SEA Seattle/Tacoma Intl

YTZSEA

Toronto Island

Thu 1/10

12:15 p.m.-6:52 p.m.

1 stop9h 37m

Seattle/Tacoma Intl

Sat 3/10

1:22 p.m.-10:07 a.m.

2 stops17h 45m

C$ 671

TorontoSeattle

YTZ Toronto Island - SEA Seattle/Tacoma Intl

YTZSEA

Toronto Island

Sat 29/8

12:15 p.m.-7:07 p.m.

1 stop9h 52m

Seattle/Tacoma Intl

Wed 7/10

11:13 p.m.-10:07 a.m.

1 stop7h 54m

C$ 672

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Seattle from

How to get the cheapest flight ticket from Toronto Island Airport to Seattle

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Seattle?

Our data shows that Thursday is the least expensive day to fly to Seattle. Tickets to fly out on this day can be as low as C$ 518. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around C$ 904. These prices are subject to change though, so be sure to set up a Price Alert for flights to Seattle.

What is the cheapest time of day to depart on your flight to Seattle?

Our most recent data shows that the best time of day to fly to Seattle is in the evening. Flights from Toronto Island Airport to Seattle during this time can be as low as C$ 505. Flights in the morning are often more expensive with an average ticket price of C$ 1,272.

When to book flights from Toronto Island Airport to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Toronto Island Airport to Seattle according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Toronto Island Airport to Seattle (YTZ to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Toronto Island Airport to Seattle

Fastest flight time

8h 33m

Direct flights

None
The fastest flight from Toronto Island Airport to Seattle takes 8h 33m
There are no direct flights from Toronto Island Airport to Seattle. There are no popular flight routes from Toronto Island Airport to Seattle.
Search flight deals

Frequently asked questions about flying from Toronto Island Airport to Seattle

  • How far is Toronto Island to Seattle/Tacoma Intl by plane?

    The straight-line distance from Toronto Island to Seattle/Tacoma Intl is 3323.2 km. Flights usually cover this in 8h 33m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Toronto Island Airport to Seattle/Tacoma Intl Airport?

    Prices for flights from Toronto Island Airport to Seattle/Tacoma Intl Airport are updated daily.

  • How old do you have to be to fly from Toronto Island Airport to Seattle/Tacoma Intl Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Toronto Island Airport to Seattle/Tacoma Intl Airport.

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

    The travel and health documents you'll need for your trip to Seattle/Tacoma Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Lynnwood
SeaTac
Tacoma
Kirkland
Leavenworth
Redmond
Marysville
Woodinville
Puyallup
Tukwila
Olympia
Ellensburg
Federal Way
Bainbridge Island
Gig Harbor
Kent
Edmonds
Shoreline
Chehalis
Ocean Shores

Why use momondo?

Why should I use momondo to find a flight deal from Toronto to Seattle?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Toronto to Seattle. momondo saves you time and could save you money on your trip.

Can I find flights from Toronto to Seattle with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Seattle from Toronto with this policy.

How can momondo help me find flights from Toronto to Seattle?

Once all potential Toronto to Seattle flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Toronto to Seattle right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Seattle, momondo offers a useful price alert feature which will track prices for flights to Seattle from Toronto and alert you when they change.

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