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Cheap flights from Seattle to Ontario from C$ 142

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 9/9. 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

Alaska Airlines Logo
7:16 a.m. - 3:00 p.m.SEA-YYZ
4h 44mdirect
Alaska Airlines Logo
4:45 p.m. - 7:08 p.m.YYZ-SEA
5h 23mdirect
C$ 307Alaska Airlines
Find Deal
Tue, 9 Sep - Wed, 24 Sep
WestJet Logo
1:50 p.m. - 12:22 a.m.SEA-YYZ
7h 32m1 stop
WestJet Logo
6:45 a.m. - 12:33 p.m.YYZ-SEA
8h 48m1 stop
C$ 327WestJet
Find Deal
Wed, 3 Sep - Sun, 7 Sep
Logo
7:16 a.m. - 3:00 p.m.SEA-YYZ
4h 44mdirect
Logo
3:00 p.m. - 8:29 p.m.YYZ-SEA
8h 29m1 stop
C$ 328
Find Deal
Tue, 9 Sep - Wed, 24 Sep
WestJet Logo
7:05 a.m. - 5:22 p.m.SEA-YYZ
7h 17m1 stop
WestJet Logo
12:00 p.m. - 7:14 p.m.YYZ-SEA
10h 14m2 stops
C$ 331WestJet
Find Deal
Tue, 26 Aug - Tue, 9 Sep
WestJet Logo
1:50 p.m. - 12:22 a.m.SEA-YYZ
7h 32m1 stop
WestJet Logo
8:00 a.m. - 12:59 p.m.YYZ-SEA
7h 59m1 stop
C$ 332WestJet
Find Deal
Wed, 3 Sep - Wed, 10 Sep
WestJet Logo
2:05 p.m. - 5:51 a.m.SEA-YYZ
12h 46m2 stops
WestJet Logo
12:00 p.m. - 8:29 p.m.YYZ-SEA
11h 29m2 stops
C$ 335WestJet
Find Deal
Mon, 15 Sep - Wed, 17 Sep
WestJet Logo
7:05 a.m. - 5:22 p.m.SEA-YYZ
7h 17m1 stop
WestJet Logo
8:00 a.m. - 12:59 p.m.YYZ-SEA
7h 59m1 stop
C$ 336WestJet
Find Deal
Tue, 26 Aug - Wed, 3 Sep
WestJet Logo
2:05 p.m. - 5:51 a.m.SEA-YYZ
12h 46m2 stops
WestJet Logo
3:00 p.m. - 8:29 p.m.YYZ-SEA
8h 29m1 stop
C$ 338WestJet
Find Deal
Mon, 15 Sep - Wed, 17 Sep
Air Canada Logo
7:15 a.m. - 7:49 p.m.SEA-YTZ
9h 34m1 stop
Air Canada Logo
12:25 p.m. - 7:31 p.m.YTZ-SEA
10h 06m1 stop
C$ 349Air Canada
Find Deal
Tue, 16 Sep - Tue, 23 Sep
Air Canada Logo
5:30 a.m. - 6:45 p.m.SEA-YTZ
10h 15m2 stops
Air Canada Logo
10:20 a.m. - 7:31 p.m.YTZ-SEA
12h 11m2 stops
C$ 352Air Canada
Find Deal
Tue, 16 Sep - Tue, 23 Sep

WestJet flights from Seattle to Region of Ontario

Our best WestJet deals on Seattle to Region of Ontario flight tickets
WestJet
3 Sep
SEA1:50 p.m.Seattle/Tacoma Intl
7h 32m
1 stop
YYZ12:22 a.m.Toronto Pearson Intl
7 Sep
YYZ6:45 a.m.Toronto Pearson Intl
8h 48m
1 stop
SEA12:33 p.m.Seattle/Tacoma Intl
C$ 327
Find similar
WestJet
26 Aug
SEA7:05 a.m.Seattle/Tacoma Intl
7h 17m
1 stop
YYZ5:22 p.m.Toronto Pearson Intl
9 Sep
YYZ12:00 p.m.Toronto Pearson Intl
10h 14m
2 stops
SEA7:14 p.m.Seattle/Tacoma Intl
C$ 331
Find similar
WestJet
3 Sep
SEA1:50 p.m.Seattle/Tacoma Intl
7h 32m
1 stop
YYZ12:22 a.m.Toronto Pearson Intl
10 Sep
YYZ8:00 a.m.Toronto Pearson Intl
7h 59m
1 stop
SEA12:59 p.m.Seattle/Tacoma Intl
C$ 332
Find similar

Air Canada flights from Seattle to Region of Ontario

Our best Air Canada deals on Seattle to Region of Ontario flight tickets
Air Canada
16 Sep
SEA7:15 a.m.Seattle/Tacoma Intl
9h 34m
1 stop
YTZ7:49 p.m.Toronto Island
23 Sep
YTZ12:25 p.m.Toronto Island
10h 06m
1 stop
SEA7:31 p.m.Seattle/Tacoma Intl
C$ 349
Find similar
Air Canada
16 Sep
SEA5:30 a.m.Seattle/Tacoma Intl
10h 15m
2 stops
YTZ6:45 p.m.Toronto Island
23 Sep
YTZ10:20 a.m.Toronto Island
12h 11m
2 stops
SEA7:31 p.m.Seattle/Tacoma Intl
C$ 352
Find similar
Air Canada
16 Sep
SEA5:30 a.m.Seattle/Tacoma Intl
10h 15m
2 stops
YTZ6:45 p.m.Toronto Island
23 Sep
YTZ12:25 p.m.Toronto Island
10h 06m
1 stop
SEA7:31 p.m.Seattle/Tacoma Intl
C$ 353
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 4 August 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

Tue 9/9

7:16 a.m.-3:00 p.m.

Nonstop4h 44m

Toronto Pearson Intl

Wed 24/9

4:45 p.m.-7:08 p.m.

Nonstop5h 23m

C$ 307

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 3/9

1:50 p.m.-12:22 a.m.

1 stop7h 32m

Toronto Pearson Intl

Sun 7/9

6:45 a.m.-12:33 p.m.

1 stop8h 48m

C$ 327

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 9/9

7:16 a.m.-3:00 p.m.

Nonstop4h 44m

Toronto Pearson Intl

Wed 24/9

3:00 p.m.-8:29 p.m.

1 stop8h 29m

C$ 328

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 26/8

7:05 a.m.-5:22 p.m.

1 stop7h 17m

Toronto Pearson Intl

Tue 9/9

12:00 p.m.-7:14 p.m.

2 stops10h 14m

C$ 331

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 3/9

1:50 p.m.-12:22 a.m.

1 stop7h 32m

Toronto Pearson Intl

Wed 10/9

8:00 a.m.-12:59 p.m.

1 stop7h 59m

C$ 332

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Mon 15/9

2:05 p.m.-5:51 a.m.

2 stops12h 46m

Toronto Pearson Intl

Wed 17/9

12:00 p.m.-8:29 p.m.

2 stops11h 29m

C$ 335

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 26/8

7:05 a.m.-5:22 p.m.

1 stop7h 17m

Toronto Pearson Intl

Wed 3/9

8:00 a.m.-12:59 p.m.

1 stop7h 59m

C$ 336

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Mon 15/9

2:05 p.m.-5:51 a.m.

2 stops12h 46m

Toronto Pearson Intl

Wed 17/9

3:00 p.m.-8:29 p.m.

1 stop8h 29m

C$ 338

SeattleToronto

SEA - YTZ

SEAYTZ

Seattle/Tacoma Intl

Tue 16/9

7:15 a.m.-7:49 p.m.

1 stop9h 34m

Toronto Island

Tue 23/9

12:25 p.m.-7:31 p.m.

1 stop10h 06m

C$ 349

SeattleToronto

SEA - YTZ

SEAYTZ

Seattle/Tacoma Intl

Tue 16/9

5:30 a.m.-6:45 p.m.

2 stops10h 15m

Toronto Island

Tue 23/9

10:20 a.m.-7:31 p.m.

2 stops12h 11m

C$ 352

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$ 390. 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$ 394.

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$ 485. The most expensive day to fly to Region of Ontario is Tuesday, with ticket prices averaging around C$ 1,186.

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 evening. Flights from Seattle to Region of Ontario during this time can be as low as C$ 266. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are C$ 952 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$ 588 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$ 403 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$ 142

Fastest flight time

4h 44m

Direct flights

Every day

Airports in Region of Ontario

7 airports
The best one-way flight to Region of Ontario from Seattle in the past 72 hours is C$ 142. The best round-trip flight deal from Seattle to Region of Ontario found on momondo in the last 72 hours is C$ 307.
The fastest flight from Seattle to Region of Ontario takes 4h 44m
Direct flights go from Seattle to Region of Ontario every day.
There are 7 airports near Region of Ontario: Ottawa (YOW), Montreal Pierre Elliott Trudeau Intl (YUL), Toronto Region of Waterloo Intl (YKF), London (YXU), Toronto Pearson Intl (YYZ), Toronto Island (YTZ), Hamilton (YHM)
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
Air CanadaPriceFrom C$ 190Free CancellationRating
7.1
9,879 reviews
Search Air Canada flights
WestJetPriceFrom C$ 296Free CancellationRating
7.2
2,994 reviews
Search WestJet flights
Alaska AirlinesPriceFrom C$ 420Free CancellationRating
8.0
10,000 reviews
Search Alaska 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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