How many flights depart from Seattle to Region of Ontario on average per day?

As of March 2026, there are 4 flights per day flying from Seattle to Region of Ontario. The most common time of day flights depart is 8:00a.m., with 95% of flights taking off at noon.

Which airlines fly to Region of Ontario?

Alaska Airlines, Air Canada and WestJet are the top three most popular airlines that fly to Region of Ontario from Seattle according to our data. Alaska Airlines is the first choice among our users, with 63% of people opting to fly with this airline when travelling to Region of Ontario. Keep in mind that there are 3 different airlines that fly to Region of Ontario on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Seattle/Tacoma Intl to Ontario?

Alaska Airlines, United Airlines, and Delta are the most popular carriers operating from Seattle/Tacoma Intl to Ontario

How many flights depart from Seattle to Region of Ontario on average per week?

The number of flights available between Seattle and Region of Ontario is 31 per week as of March 2026. The most frequent departure day is Mon, with 16% of weekly flights leaving on this day.

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?

The number of operators available for flights from Seattle/Tacoma Intl Airport to Ontario is 3 as of March 2026.

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.

C$ 134 Cheap Flights from Seattle to Ontario in 2026

1 adult

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Find the cheapest flights from Seattle to Ontario

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

10:20 a.m. - 11:46 p.m.

SEA

YYZ

10h 26m

2 stops

12:30 a.m. - 9:50 a.m.

YYZ

SEA

12h 20m

2 stops

C$ 300Air Canada

Sat, 25 Apr - Fri, 1 May

7:20 p.m. - 8:10 a.m.

SEA

YYZ

9h 50m

2 stops

12:30 a.m. - 9:50 a.m.

YYZ

SEA

12h 20m

2 stops

C$ 301Air Canada

Sat, 2 May - Fri, 8 May

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

SEA

YYZ

4h 54mdirect

6:45 p.m. - 9:08 p.m.

YYZ

SEA

5h 23mdirect

C$ 305Air Canada

Sat, 25 Apr - Sat, 2 May

3:40 p.m. - 5:29 a.m.

SEA

YYZ

10h 49m

2 stops

12:30 a.m. - 9:50 a.m.

YYZ

SEA

12h 20m

2 stops

C$ 312Air Canada

Wed, 29 Apr - Tue, 5 May

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

SEA

YYZ

4h 54mdirect

12:30 a.m. - 9:50 a.m.

YYZ

SEA

12h 20m

2 stops

C$ 314Air Canada

Wed, 29 Apr - Tue, 5 May

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

SEA

YYZ

4h 54mdirect

12:30 a.m. - 9:50 a.m.

YYZ

SEA

12h 20m

2 stops

C$ 315Air Canada

Wed, 29 Apr - Tue, 5 May

7:35 p.m. - 5:35 a.m.

SEA

YOW

7h 00m

1 stop

1:20 p.m. - 6:45 p.m.

YOW

SEA

8h 25m

1 stop

C$ 457WestJet

Sun, 26 Apr - Mon, 4 May

7:35 p.m. - 7:05 a.m.

SEA

YUL

8h 30m

1 stop

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

YUL

SEA

15h 00m

2 stops

C$ 463WestJet

Mon, 4 May - Fri, 8 May

7:35 p.m. - 5:35 a.m.

SEA

YOW

7h 00m

1 stop

1:20 p.m. - 6:45 p.m.

YOW

SEA

8h 25m

1 stop

C$ 463WestJet

Tue, 12 May - Sun, 17 May

7:51 p.m. - 5:20 a.m.

SEA

YXU

30h 29m

2 stops

6:10 a.m. - 6:45 p.m.

YXU

SEA

15h 35m

1 stop

C$ 627Multiple Airlines

Sun, 26 Apr - Sun, 3 May

Air Canada flights from Seattle to Region of Ontario

Our best Air Canada deals on Seattle to Region of Ontario flight tickets

Air Canada

25 Apr

SEA10:20 a.m.Seattle/Tacoma Intl

10h 26m

2 stops

YYZ11:46 p.m.Toronto Pearson Intl

1 May

YYZ12:30 a.m.Toronto Pearson Intl

12h 20m

2 stops

SEA9:50 a.m.Seattle/Tacoma Intl

C$ 300

Air Canada

2 May

SEA7:20 p.m.Seattle/Tacoma Intl

9h 50m

2 stops

YYZ8:10 a.m.Toronto Pearson Intl

8 May

YYZ12:30 a.m.Toronto Pearson Intl

12h 20m

2 stops

SEA9:50 a.m.Seattle/Tacoma Intl

C$ 301

Air Canada

25 Apr

SEA8:00 a.m.Seattle/Tacoma Intl

4h 54m

YYZ3:54 p.m.Toronto Pearson Intl

2 May

YYZ6:45 p.m.Toronto Pearson Intl

5h 23m

SEA9:08 p.m.Seattle/Tacoma Intl

C$ 305

Alaska Airlines flights from Seattle to Region of Ontario

Our best Alaska Airlines deals on Seattle to Region of Ontario flight tickets

Alaska Airlines

25 Apr

SEA7:55 a.m.Seattle/Tacoma Intl

4h 50m

YYZ3:45 p.m.Toronto Pearson Intl

2 May

YYZ4:55 p.m.Toronto Pearson Intl

5h 28m

SEA7:23 p.m.Seattle/Tacoma Intl

C$ 351

Alaska Airlines

23 Apr

SEA7:55 a.m.Seattle/Tacoma Intl

4h 50m

YYZ3:45 p.m.Toronto Pearson Intl

28 Apr

YYZ4:55 p.m.Toronto Pearson Intl

5h 28m

SEA7:23 p.m.Seattle/Tacoma Intl

C$ 403

Alaska Airlines

30 Mar

SEA8:09 a.m.Seattle/Tacoma Intl

4h 36m

YYZ3:45 p.m.Toronto Pearson Intl

3 Apr

YYZ4:55 p.m.Toronto Pearson Intl

5h 30m

SEA7:25 p.m.Seattle/Tacoma Intl

C$ 631

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 25/4

10:20 a.m.-11:46 p.m.

2 stops10h 26m

Toronto Pearson Intl

Fri 1/5

12:30 a.m.-9:50 a.m.

2 stops12h 20m

C$ 300

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 2/5

7:20 p.m.-8:10 a.m.

2 stops9h 50m

Toronto Pearson Intl

Fri 8/5

12:30 a.m.-9:50 a.m.

2 stops12h 20m

C$ 301

Quickest round-trip

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 25/4

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

Nonstop4h 54m

Toronto Pearson Intl

Sat 2/5

6:45 p.m.-9:08 p.m.

Nonstop5h 23m

C$ 305

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 29/4

3:40 p.m.-5:29 a.m.

2 stops10h 49m

Toronto Pearson Intl

Tue 5/5

12:30 a.m.-9:50 a.m.

2 stops12h 20m

C$ 312

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 29/4

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

Nonstop4h 54m

Toronto Pearson Intl

Tue 5/5

12:30 a.m.-9:50 a.m.

2 stops12h 20m

C$ 314

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 29/4

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

Nonstop4h 54m

Toronto Pearson Intl

Tue 5/5

12:30 a.m.-9:50 a.m.

2 stops12h 20m

C$ 315

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

Sun 26/4

7:35 p.m.-5:35 a.m.

1 stop7h 00m

Ottawa

Mon 4/5

1:20 p.m.-6:45 p.m.

1 stop8h 25m

C$ 457

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Mon 4/5

7:35 p.m.-7:05 a.m.

1 stop8h 30m

Montreal Pierre Elliott Trudeau Intl

Fri 8/5

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

2 stops15h 00m

C$ 463

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

Tue 12/5

7:35 p.m.-5:35 a.m.

1 stop7h 00m

Ottawa

Sun 17/5

1:20 p.m.-6:45 p.m.

1 stop8h 25m

C$ 463

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sun 26/4

7:51 p.m.-5:20 a.m.

2 stops30h 29m

London

Sun 3/5

6:10 a.m.-6:45 p.m.

1 stop15h 35m

C$ 627

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

Other information

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$ 342. 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$ 375.

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$ 531. The most expensive day to fly to Region of Ontario is Monday, with ticket prices averaging around C$ 934.

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$ 521 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$ 331 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

Fastest flight time	4h 40m
Direct flights	Every day
Airports in Region of Ontario	123 airports

The fastest flight from Seattle to Region of Ontario takes 4h 40m

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 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?
The number of operators available for flights from Seattle/Tacoma Intl Airport to Ontario is 3 as of March 2026.
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?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Seattle to Region of Ontario is Airbus A320-100/200 (16.72% of total bookings). The next most popular plane models are Airbus A330-900neo (16.39%), Airbus A330-200 (12.71%), and Boeing 737 MAX 8 (8.03%).

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
WestJet	PriceFrom C$ 283	Free Cancellation	Rating 7.2 3,296 reviews	Search WestJet flights
Alaska Airlines	PriceFrom C$ 303	Free Cancellation	Rating 7.9 12,058 reviews	Search Alaska Airlines flights
Air Canada	PriceFrom C$ 361	Free Cancellation	Rating 7.1 10,811 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.