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Cheap flights from Seattle to Ontario from C$ 137

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Ontario departing on 14/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Seattle to Ontario

Cheap round-trip flights

Enter your travel dates to find the best prices.
Air Canada Logo
8:00 a.m. - 3:43 p.m.
SEA
-
YYZ
4h 43mdirect
Air Canada Logo
5:55 p.m. - 10:57 p.m.
YYZ
-
SEA
8h 02m
1 stop
C$ 303Air Canada
Sat, 21 Feb - Sat, 28 Feb
Multiple Airlines Logo
8:00 a.m. - 3:43 p.m.
SEA
-
YYZ
4h 43mdirect
Multiple Airlines Logo
4:45 p.m. - 7:15 p.m.
YYZ
-
SEA
5h 30mdirect
C$ 310Multiple Airlines
Wed, 18 Mar - Wed, 25 Mar
Multiple Airlines Logo
8:00 a.m. - 3:43 p.m.
SEA
-
YYZ
4h 43mdirect
Multiple Airlines Logo
4:45 p.m. - 7:18 p.m.
YYZ
-
SEA
5h 33mdirect
C$ 314Multiple Airlines
Sat, 21 Feb - Sat, 28 Feb
Air Canada Logo
8:00 a.m. - 3:43 p.m.
SEA
-
YYZ
4h 43mdirect
Air Canada Logo
7:50 p.m. - 10:16 p.m.
YYZ
-
SEA
5h 26mdirect
C$ 330Air Canada
Sat, 14 Mar - Sun, 22 Mar
Air Canada Logo
8:00 a.m. - 3:43 p.m.
SEA
-
YYZ
4h 43mdirect
Air Canada Logo
7:00 a.m. - 3:01 p.m.
YYZ
-
SEA
11h 01m
1 stop
C$ 332Air Canada
Wed, 18 Mar - Wed, 25 Mar
Air Canada Logo
3:40 p.m. - 5:38 a.m.
SEA
-
YYZ
10h 58m
2 stops
Air Canada Logo
7:00 a.m. - 3:01 p.m.
YYZ
-
SEA
11h 01m
1 stop
C$ 336Air Canada
Sat, 14 Mar - Sun, 22 Mar
Air Canada Logo
8:00 a.m. - 3:54 p.m.
SEA
-
YYZ
4h 54mdirect
Air Canada Logo
7:30 p.m. - 9:53 p.m.
YYZ
-
SEA
5h 23mdirect
C$ 346Air Canada
Wed, 15 Apr - Tue, 21 Apr
WestJet Logo
7:35 p.m. - 7:00 a.m.
SEA
-
YUL
8h 25m
1 stop
WestJet Logo
8:00 p.m. - 9:40 a.m.
YUL
-
SEA
16h 40m
1 stop
C$ 385WestJet
Fri, 1 May - Sun, 3 May
WestJet Logo
7:35 p.m. - 7:00 a.m.
SEA
-
YUL
8h 25m
1 stop
WestJet Logo
8:00 p.m. - 9:40 a.m.
YUL
-
SEA
16h 40m
1 stop
C$ 386WestJet
Fri, 1 May - Mon, 4 May
WestJet Logo
3:10 p.m. - 5:29 a.m.
SEA
-
YKF
11h 19m
1 stop
WestJet Logo
8:40 p.m. - 9:40 a.m.
YKF
-
SEA
16h 00m
1 stop
C$ 396WestJet
Mon, 20 Apr - Sun, 10 May

WestJet flights from Seattle to Region of Ontario

Our best WestJet deals on Seattle to Region of Ontario flight tickets
WestJet
4 Jun
SEA7:35 p.m.Seattle/Tacoma Intl
7h 10m
1 stop
YYZ5:45 a.m.Toronto Pearson Intl
8 Jun
YYZ12:00 p.m.Toronto Pearson Intl
9h 45m
2 stops
SEA6:45 p.m.Seattle/Tacoma Intl
C$ 344
WestJet
15 Apr
SEA3:10 p.m.Seattle/Tacoma Intl
11h 48m
2 stops
YYZ5:58 a.m.Toronto Pearson Intl
21 Apr
YYZ7:45 a.m.Toronto Pearson Intl
9h 34m
1 stop
SEA2:19 p.m.Seattle/Tacoma Intl
C$ 354
WestJet
6 May
SEA10:30 a.m.Seattle/Tacoma Intl
9h 15m
1 stop
YYZ10:45 p.m.Toronto Pearson Intl
11 May
YYZ10:50 a.m.Toronto Pearson Intl
10h 55m
1 stop
SEA6:45 p.m.Seattle/Tacoma Intl
C$ 373

Air Canada flights from Seattle to Region of Ontario

Our best Air Canada deals on Seattle to Region of Ontario flight tickets
Air Canada
21 Feb
SEA8:00 a.m.Seattle/Tacoma Intl
4h 43m
YYZ3:43 p.m.Toronto Pearson Intl
28 Feb
YYZ5:55 p.m.Toronto Pearson Intl
8h 02m
1 stop
SEA10:57 p.m.Seattle/Tacoma Intl
C$ 303
Air Canada
14 Mar
SEA8:00 a.m.Seattle/Tacoma Intl
4h 43m
YYZ3:43 p.m.Toronto Pearson Intl
22 Mar
YYZ7:50 p.m.Toronto Pearson Intl
5h 26m
SEA10:16 p.m.Seattle/Tacoma Intl
C$ 330
Air Canada
18 Mar
SEA8:00 a.m.Seattle/Tacoma Intl
4h 43m
YYZ3:43 p.m.Toronto Pearson Intl
25 Mar
YYZ7:00 a.m.Toronto Pearson Intl
11h 01m
1 stop
SEA3:01 p.m.Seattle/Tacoma Intl
C$ 332

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Region of Ontario 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 3 February 2026.
Use the filters below to find and compare flights from Seattle to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 21/2

8:00 a.m.-3:43 p.m.

Nonstop4h 43m

Toronto Pearson Intl

Sat 28/2

5:55 p.m.-10:57 p.m.

1 stop8h 02m

C$ 303

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 18/3

8:00 a.m.-3:43 p.m.

Nonstop4h 43m

Toronto Pearson Intl

Wed 25/3

4:45 p.m.-7:15 p.m.

Nonstop5h 30m

C$ 310

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 21/2

8:00 a.m.-3:43 p.m.

Nonstop4h 43m

Toronto Pearson Intl

Sat 28/2

4:45 p.m.-7:18 p.m.

Nonstop5h 33m

C$ 314

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 14/3

8:00 a.m.-3:43 p.m.

Nonstop4h 43m

Toronto Pearson Intl

Sun 22/3

7:50 p.m.-10:16 p.m.

Nonstop5h 26m

C$ 330

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 18/3

8:00 a.m.-3:43 p.m.

Nonstop4h 43m

Toronto Pearson Intl

Wed 25/3

7:00 a.m.-3:01 p.m.

1 stop11h 01m

C$ 332

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 14/3

3:40 p.m.-5:38 a.m.

2 stops10h 58m

Toronto Pearson Intl

Sun 22/3

7:00 a.m.-3:01 p.m.

1 stop11h 01m

C$ 336

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 15/4

8:00 a.m.-3:54 p.m.

Nonstop4h 54m

Toronto Pearson Intl

Tue 21/4

7:30 p.m.-9:53 p.m.

Nonstop5h 23m

C$ 346

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Fri 1/5

7:35 p.m.-7:00 a.m.

1 stop8h 25m

Montreal Pierre Elliott Trudeau Intl

Sun 3/5

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

1 stop16h 40m

C$ 385

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Fri 1/5

7:35 p.m.-7:00 a.m.

1 stop8h 25m

Montreal Pierre Elliott Trudeau Intl

Mon 4/5

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

1 stop16h 40m

C$ 386

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

Mon 20/4

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

1 stop11h 19m

Toronto Region of Waterloo Intl

Sun 10/5

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

1 stop16h 00m

C$ 396

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 Ontario from

How to get the cheapest flight ticket from Seattle to Region of Ontario

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 month to fly to Region of Ontario?

In general, January is the cheapest month to fly from Seattle to Region of Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around C$ 367. If you are unable to visit Region of Ontario during the month of January, then departing from Seattle during the month November is also very affordable. Most momondo users find prices during this month for around C$ 374.

What is the cheapest day to depart on your flight to Region of Ontario?

The cheapest day to depart from Seattle to Region of Ontario is on a Wednesday. Travellers who choose to depart for Region of Ontario on a Wednesday will often find tickets for as low as C$ 530. The most expensive day to fly to Region of Ontario is Monday, with ticket prices averaging around C$ 932.

What is the cheapest Seattle/Tacoma Intl to Ontario flight route?

Fly from Seattle/Tacoma Intl to Toronto Pearson Intl for the best Seattle/Tacoma Intl - Ontario flight prices

How far in advance should I book a flight to Region of Ontario?

You are more likely to see cheaper flights to Region of Ontario from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Region of Ontario for around C$ 531 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Region of Ontario from Seattle for as low as C$ 279 on momondo.

What cabin class options are available on Seattle/Tacoma Intl to Ontario flights?

There are 3 cabin classes available to choose from on Seattle/Tacoma Intl to Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Seattle to Region of Ontario flights?

No. A direct flight is the cheapest option for a flight between Seattle to Region of Ontario.

Cheap Seattle to Region of Ontario flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Region of Ontario

Best price found

C$ 130

Fastest flight time

4h 43m

Direct flights

Every day

Airports in Region of Ontario

123 airports
The best one-way flight to Region of Ontario from Seattle in the past 72 hours is C$ 130. The best round-trip flight deal from Seattle to Region of Ontario found on momondo in the last 72 hours is C$ 330.
The fastest flight from Seattle to Region of Ontario takes 4h 43m
Direct flights go from Seattle to Region of Ontario every day.
There are 123 airports in Region of Ontario. From Seattle there are direct flights to Montreal Pierre Elliott Trudeau Intl (YUL), Toronto Pearson Intl (YYZ).
Search flight deals

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

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

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Ontario?

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Ontario.

  • What documentation or ID do you need to fly to Ontario?

    The travel and health documents required for your trip to Ontario can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Ontario. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Seattle to Region of Ontario?

Best airlines flying from Seattle to Region of Ontario

Compare and see reviews for airlines that fly from Seattle to Region of Ontario with momondo
Airline
Rating
Free Cancellation
Price
WestJetPriceFrom C$ 282Free CancellationRating
7.2
3,254 reviews
Search WestJet flights
Alaska AirlinesPriceFrom C$ 302Free CancellationRating
8.0
11,830 reviews
Search Alaska Airlines flights
Air CanadaPriceFrom C$ 360Free CancellationRating
7.1
10,676 reviews
Search Air Canada flights

Why use momondo?

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

It is quick and easy to find Seattle to Ontario flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Ontario that suits you.

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

Yes. All flights to Ontario from Seattle on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once all potential Seattle to Ontario 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 Seattle to Ontario right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Seattle to Ontario flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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