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

The number of flights available between Seattle and Region of Ontario is 5 per day as of March 2026. The most frequent departure time is 8:00AM, with 95% of daily flights leaving at noon.

What 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 50% of people opting to fly with this airline when traveling to Region of Ontario. Keep in mind that there are 5 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?

Delta, American Airlines, and United Airlines 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?

36 flights are operational weekly from Seattle to Region of Ontario as of March 2026. The most popular departure day for this route is Fri, with 17% of flights per week taking off 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 refreshed on a daily basis.

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 5 as of March 2026.

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

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Seattle/Tacoma Intl Airport to Ontario.

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

The travel and health documents you'll need for your trip to Ontario 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 Ontario. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$109 Cheap Flights from Seattle to Ontario in 2026

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Round-trip

One-way

Last minute

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Cheap round-trip flights

Enter your travel dates to find the best prices.

8:00 am - 3:50 pm

SEA

YYZ

4h 50mnonstop

12:30 am - 9:50 am

YYZ

SEA

12h 20m

2 stops

$236Air Canada

Sat, May 2 - Fri, May 8

8:00 am - 3:54 pm

SEA

YYZ

4h 54mnonstop

4:55 pm - 7:23 pm

YYZ

SEA

5h 28mnonstop

$240Multiple Airlines

Sat, Apr 25 - Sat, May 2

8:00 am - 3:54 pm

SEA

YYZ

4h 54mnonstop

12:30 am - 9:50 am

YYZ

SEA

12h 20m

2 stops

$241Air Canada

Sat, Apr 25 - Fri, May 1

7:20 pm - 8:10 am

SEA

YYZ

9h 50m

2 stops

12:30 am - 9:50 am

YYZ

SEA

12h 20m

2 stops

$244Air Canada

Sat, May 2 - Fri, May 8

10:20 am - 11:46 pm

SEA

YYZ

10h 26m

2 stops

12:30 am - 9:50 am

YYZ

SEA

12h 20m

2 stops

$246Air Canada

Sat, Apr 25 - Fri, May 1

7:55 am - 3:45 pm

SEA

YYZ

4h 50mnonstop

4:55 pm - 7:23 pm

YYZ

SEA

5h 28mnonstop

$247Alaska Airlines

Sat, Apr 25 - Sat, May 2

10:30 am - 1:13 am

SEA

YYZ

11h 43m

2 stops

12:30 am - 9:50 am

YYZ

SEA

12h 20m

2 stops

$249Air Canada

Sat, May 2 - Fri, May 8

7:55 am - 3:45 pm

SEA

YYZ

4h 50mnonstop

4:55 pm - 7:23 pm

YYZ

SEA

5h 28mnonstop

$256Alaska Airlines

Sat, Apr 25 - Sat, May 2

7:35 pm - 7:05 am

SEA

YUL

8h 30m

1 stop

6:45 am - 6:45 pm

YUL

SEA

15h 00m

2 stops

$357WestJet

Wed, Apr 29 - Wed, May 6

7:35 pm - 7:05 am

SEA

YUL

8h 30m

1 stop

6:45 am - 6:45 pm

YUL

SEA

15h 00m

2 stops

$358WestJet

Mon, May 4 - Fri, May 8

Alaska Airlines flights from Seattle to Region of Ontario

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

Alaska Airlines

Apr 25

SEA7:55 amSeattle/Tacoma Intl

4h 50m

YYZ3:45 pmToronto Pearson Intl

May 2

YYZ4:55 pmToronto Pearson Intl

5h 28m

SEA7:23 pmSeattle/Tacoma Intl

$247

Alaska Airlines

Apr 25

SEA7:55 amSeattle/Tacoma Intl

4h 50m

YYZ3:45 pmToronto Pearson Intl

May 2

YYZ4:55 pmToronto Pearson Intl

5h 28m

SEA7:23 pmSeattle/Tacoma Intl

$256

Alaska Airlines

Apr 26

SEA7:55 amSeattle/Tacoma Intl

4h 50m

YYZ3:45 pmToronto Pearson Intl

Apr 29

YYZ4:55 pmToronto Pearson Intl

5h 28m

SEA7:23 pmSeattle/Tacoma Intl

$294

Air Canada flights from Seattle to Region of Ontario

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

Air Canada

May 2

SEA8:00 amSeattle/Tacoma Intl

4h 50m

YYZ3:50 pmToronto Pearson Intl

May 8

YYZ12:30 amToronto Pearson Intl

12h 20m

2 stops

SEA9:50 amSeattle/Tacoma Intl

$236

Air Canada

Apr 25

SEA8:00 amSeattle/Tacoma Intl

4h 54m

YYZ3:54 pmToronto Pearson Intl

May 1

YYZ12:30 amToronto Pearson Intl

12h 20m

2 stops

SEA9:50 amSeattle/Tacoma Intl

$241

Air Canada

May 2

SEA7:20 pmSeattle/Tacoma Intl

9h 50m

2 stops

YYZ8:10 amToronto Pearson Intl

May 8

YYZ12:30 amToronto Pearson Intl

12h 20m

2 stops

SEA9:50 amSeattle/Tacoma Intl

$244

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 5/2

8:00 am-3:50 pm

Nonstop4h 50m

Toronto Pearson Intl

Fri 5/8

12:30 am-9:50 am

2 stops12h 20m

$236

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 4/25

8:00 am-3:54 pm

Nonstop4h 54m

Toronto Pearson Intl

Sat 5/2

4:55 pm-7:23 pm

Nonstop5h 28m

$240

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 4/25

8:00 am-3:54 pm

Nonstop4h 54m

Toronto Pearson Intl

Fri 5/1

12:30 am-9:50 am

2 stops12h 20m

$241

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 5/2

7:20 pm-8:10 am

2 stops9h 50m

Toronto Pearson Intl

Fri 5/8

12:30 am-9:50 am

2 stops12h 20m

$244

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 4/25

10:20 am-11:46 pm

2 stops10h 26m

Toronto Pearson Intl

Fri 5/1

12:30 am-9:50 am

2 stops12h 20m

$246

Quickest round-trip

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 4/25

7:55 am-3:45 pm

Nonstop4h 50m

Toronto Pearson Intl

Sat 5/2

4:55 pm-7:23 pm

Nonstop5h 28m

$247

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 5/2

10:30 am-1:13 am

2 stops11h 43m

Toronto Pearson Intl

Fri 5/8

12:30 am-9:50 am

2 stops12h 20m

$249

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 4/25

7:55 am-3:45 pm

Nonstop4h 50m

Toronto Pearson Intl

Sat 5/2

4:55 pm-7:23 pm

Nonstop5h 28m

$256

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Wed 4/29

7:35 pm-7:05 am

1 stop8h 30m

Montreal Pierre Elliott Trudeau Intl

Wed 5/6

6:45 am-6:45 pm

2 stops15h 00m

$357

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Mon 5/4

7:35 pm-7:05 am

1 stop8h 30m

Montreal Pierre Elliott Trudeau Intl

Fri 5/8

6:45 am-6:45 pm

2 stops15h 00m

$358

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?

The month of January is, on average, the cheapest month to fly to Region of Ontario from Seattle, with most prices found around $250. If you aren’t able to travel during the month of January, then book flights to Region of Ontario from Seattle during November instead. Flights to Region of Ontario in November, while not as cheap as those in January, still average around $274.

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

According to our data, Tuesday is the cheapest day to fly to Region of Ontario from Seattle. The lowest ticket price found for a Tuesday departure recently was $509. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from Seattle to Region of Ontario on a Saturday will generally be more expensive and average around $687. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

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 $380 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 $242 on momondo.

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

There are 4 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 10% 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	$225
Fastest flight time	4h 40m
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 $225. The best round-trip flight deal from Seattle to Region of Ontario found on momondo in the last 72 hours is $462.

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 refreshed on a daily basis.
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 5 as of March 2026.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Ontario?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Seattle/Tacoma Intl Airport to Ontario.
What documentation or ID do you need to fly to Ontario?
The travel and health documents you'll need for your trip to Ontario 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 Ontario. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Seattle to Region of Ontario?
momondo data reveals that the most frequently booked plane model on the route from Seattle to Region of Ontario is Airbus A320-100/200, representing 16.72% of all bookings. The subsequent popular models are Airbus A330-900neo at 16.39%, Airbus A330-200 at 12.71%, and Boeing 737 MAX 8 at 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
Delta	PriceFrom $138	Free Cancellation	Rating 7.9 8,304 reviews	Search Delta flights
Air Canada	PriceFrom $165	Free Cancellation	Rating 7.1 10,818 reviews	Search Air Canada flights
WestJet	PriceFrom $222	Free Cancellation	Rating 7.2 3,297 reviews	Search WestJet flights
United Airlines	PriceFrom $238	Free Cancellation	Rating 7.4 9,454 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $252	Free Cancellation	Rating 7.9 12,082 reviews	Search Alaska Airlines flights

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Seattle to Ontario. Millions of users trust and use momondo every year so you are in good hands.

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 you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Ontario from Seattle.

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

Of course. momondo tracks the price of Seattle to Ontario flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Region of Ontario trip

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Popular cities in Ontario

Flights to Torontofrom $148

Flights to Vancouverfrom $145

Flights to Montrealfrom $201

Flights to Calgaryfrom $228

Flights to Ottawafrom $218

Flights to Halifaxfrom $242

Flights to Winnipegfrom $248

Flights to Québec Cityfrom $276

Flights to Kelownafrom $245

Flights to Saskatoonfrom $282

Flights to St. John'sfrom $367

Flights to Reginafrom $359

Cheap flights from Seattle to Ontario from $109

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 4/7. 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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Alaska Airlines flights from Seattle to Region of Ontario

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

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

What is the cheapest month to fly to Region of Ontario?

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

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

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

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

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

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

What airlines fly to Region of Ontario?

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

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

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

Fastest flight time

Direct flights

Airports in 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

Why use momondo?

An easier way to manage your Region of Ontario trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Ontario

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