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Cheap flights from Seattle to Ontario from C$ 125

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 25/1. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
6:07 p.m. - 6:47 a.m.SEA-YYZ
9h 40m1 stop
Multiple Airlines Logo
7:45 a.m. - 2:20 p.m.YYZ-SEA
9h 35m1 stop
C$ 340Multiple Airlines
Find Deal
Thu, 8 Jan - Mon, 12 Jan
WestJet Logo
3:10 p.m. - 5:58 a.m.SEA-YYZ
11h 48m2 stops
WestJet Logo
7:45 a.m. - 2:20 p.m.YYZ-SEA
9h 35m1 stop
C$ 342WestJet
Find Deal
Thu, 4 Dec - Thu, 11 Dec
Multiple Airlines Logo
7:55 a.m. - 3:35 p.m.SEA-YYZ
4h 40mdirect
Multiple Airlines Logo
7:45 a.m. - 2:20 p.m.YYZ-SEA
9h 35m1 stop
C$ 343Multiple Airlines
Find Deal
Tue, 9 Dec - Wed, 10 Dec
WestJet Logo
11:55 a.m. - 11:39 p.m.SEA-YYZ
8h 44m2 stops
WestJet Logo
6:30 p.m. - 2:20 p.m.YYZ-SEA
22h 50m1 stop
C$ 345WestJet
Find Deal
Sat, 29 Nov - Sat, 6 Dec
Alaska Airlines Logo
7:55 a.m. - 3:35 p.m.SEA-YYZ
4h 40mdirect
Alaska Airlines Logo
4:45 p.m. - 7:18 p.m.YYZ-SEA
5h 33mdirect
C$ 352Alaska Airlines
Find Deal
Tue, 9 Dec - Wed, 10 Dec
Air Canada Logo
10:05 a.m. - 10:41 p.m.SEA-YYZ
9h 36m2 stops
Air Canada Logo
8:15 a.m. - 2:31 p.m.YYZ-SEA
9h 16m2 stops
C$ 353Air Canada
Find Deal
Sat, 29 Nov - Sat, 6 Dec
Air Canada Logo
10:05 a.m. - 10:41 p.m.SEA-YYZ
9h 36m2 stops
Air Canada Logo
7:50 p.m. - 10:16 p.m.YYZ-SEA
5h 26mdirect
C$ 354Air Canada
Find Deal
Sat, 29 Nov - Sat, 6 Dec
Alaska Airlines Logo
7:55 a.m. - 3:35 p.m.SEA-YYZ
4h 40mdirect
Alaska Airlines Logo
4:45 p.m. - 7:18 p.m.YYZ-SEA
5h 33mdirect
C$ 367Alaska Airlines
Find Deal
Tue, 9 Dec - Thu, 11 Dec
United Airlines Logo
5:00 a.m. - 3:02 p.m.SEA-YYZ
7h 02m1 stop
United Airlines Logo
5:55 p.m. - 12:50 a.m.YYZ-SEA
9h 55m1 stop
C$ 401United Airlines
Find Deal
Tue, 9 Dec - Tue, 9 Dec
United Airlines Logo
11:20 p.m. - 11:38 a.m.SEA-YYZ
9h 18m1 stop
United Airlines Logo
3:00 p.m. - 10:32 p.m.YYZ-SEA
10h 32m1 stop
C$ 415United Airlines
Find Deal
Tue, 10 Mar - Wed, 11 Mar

WestJet flights from Seattle to Region of Ontario

Our best WestJet deals on Seattle to Region of Ontario flight tickets
WestJet
4 Dec
SEA3:10 p.m.Seattle/Tacoma Intl
11h 48m
2 stops
YYZ5:58 a.m.Toronto Pearson Intl
11 Dec
YYZ7:45 a.m.Toronto Pearson Intl
9h 35m
1 stop
SEA2:20 p.m.Seattle/Tacoma Intl
C$ 342
Find similar
WestJet
29 Nov
SEA11:55 a.m.Seattle/Tacoma Intl
8h 44m
2 stops
YYZ11:39 p.m.Toronto Pearson Intl
6 Dec
YYZ6:30 p.m.Toronto Pearson Intl
22h 50m
1 stop
SEA2:20 p.m.Seattle/Tacoma Intl
C$ 345
Find similar
WestJet
6 Dec
SEA3:20 p.m.Seattle/Tacoma Intl
11h 53m
1 stop
YYZ6:13 a.m.Toronto Pearson Intl
9 Dec
YYZ7:45 a.m.Toronto Pearson Intl
9h 35m
1 stop
SEA2:20 p.m.Seattle/Tacoma Intl
C$ 347
Find similar

Alaska Airlines flights from Seattle to Region of Ontario

Our best Alaska Airlines deals on Seattle to Region of Ontario flight tickets
Alaska Airlines
9 Dec
SEA7:55 a.m.Seattle/Tacoma Intl
4h 40m
YYZ3:35 p.m.Toronto Pearson Intl
10 Dec
YYZ4:45 p.m.Toronto Pearson Intl
5h 33m
SEA7:18 p.m.Seattle/Tacoma Intl
C$ 352
Find similar
Alaska Airlines
9 Dec
SEA7:55 a.m.Seattle/Tacoma Intl
4h 40m
YYZ3:35 p.m.Toronto Pearson Intl
11 Dec
YYZ4:45 p.m.Toronto Pearson Intl
5h 33m
SEA7:18 p.m.Seattle/Tacoma Intl
C$ 367
Find similar
Alaska Airlines
9 Dec
SEA7:55 a.m.Seattle/Tacoma Intl
4h 40m
YYZ3:35 p.m.Toronto Pearson Intl
14 Dec
YYZ4:45 p.m.Toronto Pearson Intl
5h 33m
SEA7:18 p.m.Seattle/Tacoma Intl
C$ 381
Find similar

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 November 2025.
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

Thu 8/1

6:07 p.m.-6:47 a.m.

1 stop9h 40m

Toronto Pearson Intl

Mon 12/1

7:45 a.m.-2:20 p.m.

1 stop9h 35m

C$ 340

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Thu 4/12

3:10 p.m.-5:58 a.m.

2 stops11h 48m

Toronto Pearson Intl

Thu 11/12

7:45 a.m.-2:20 p.m.

1 stop9h 35m

C$ 342

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 9/12

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

Toronto Pearson Intl

Wed 10/12

7:45 a.m.-2:20 p.m.

1 stop9h 35m

C$ 343

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 29/11

11:55 a.m.-11:39 p.m.

2 stops8h 44m

Toronto Pearson Intl

Sat 6/12

6:30 p.m.-2:20 p.m.

1 stop22h 50m

C$ 345

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 9/12

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

Toronto Pearson Intl

Wed 10/12

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

Nonstop5h 33m

C$ 352

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 29/11

10:05 a.m.-10:41 p.m.

2 stops9h 36m

Toronto Pearson Intl

Sat 6/12

8:15 a.m.-2:31 p.m.

2 stops9h 16m

C$ 353

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 29/11

10:05 a.m.-10:41 p.m.

2 stops9h 36m

Toronto Pearson Intl

Sat 6/12

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

Nonstop5h 26m

C$ 354

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 9/12

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

Toronto Pearson Intl

Thu 11/12

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

Nonstop5h 33m

C$ 367

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 9/12

5:00 a.m.-3:02 p.m.

1 stop7h 02m

Toronto Pearson Intl

Tue 9/12

5:55 p.m.-12:50 a.m.

1 stop9h 55m

C$ 401

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 10/3

11:20 p.m.-11:38 a.m.

1 stop9h 18m

Toronto Pearson Intl

Wed 11/3

3:00 p.m.-10:32 p.m.

1 stop10h 32m

C$ 415

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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$ 398. If you are unable to visit Region of Ontario during the month of January, then departing from Seattle during the month February is also very affordable. Most momondo users find prices during this month for around C$ 401.

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$ 505. The most expensive day to fly to Region of Ontario is Tuesday, with ticket prices averaging around C$ 1,122.

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

Our most recent data shows that the best time of day to fly to Region of Ontario is in the afternoon. Flights from Seattle to Region of Ontario during this time can be as low as C$ 500. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are C$ 950 on average. Flights to Region of Ontario from Seattle in the morning are generally more expensive because this time of day is more convenient for travellers’ schedules.

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$ 577 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$ 409 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?

You could potentially save up to 13% on your flight if you consider stops on a Seattle to Region of Ontario flight.

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$ 186

Fastest flight time

4h 35m

Direct flights

Every day

Airports in Region of Ontario

1 airport
The best one-way flight to Region of Ontario from Seattle in the past 72 hours is C$ 186. The best round-trip flight deal from Seattle to Region of Ontario found on momondo in the last 72 hours is C$ 411.
The fastest flight from Seattle to Region of Ontario takes 4h 35m
Direct flights go from Seattle to Region of Ontario every day.
There is 1 airport near Region of Ontario: 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$ 289Free CancellationRating
7.2
3,153 reviews
Search WestJet flights
Air CanadaPriceFrom C$ 327Free CancellationRating
7.1
10,397 reviews
Search Air Canada flights
Alaska AirlinesPriceFrom C$ 374Free CancellationRating
8.0
11,234 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom C$ 486Free CancellationRating
7.4
8,996 reviews
Search United Airlines 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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Find better results for your trip to Ontario

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