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 47% 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?

WestJet, Delta, and American 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?

26 flights are operational weekly from Seattle to Region of Ontario as of August 2026. The most popular departure day for this route is Mon, with 19% of flights per week taking off on this day.

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 3 per day as of August 2026. The most frequent departure time is 8:00AM, with 100% of daily flights leaving at noon.

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 August 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.

$153 Cheap Flights from Seattle to Ontario in 2026

Discover deals from 900+ travel sites with momondo.

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.

7:35 pm - 5:35 am

SEA

YOW

7h 00m

1 stop

12:25 pm - 6:45 pm

YOW

SEA

9h 20m

2 stops

$347WestJet

Wed, Sep 23 - Thu, Sep 24

7:35 pm - 7:05 am

SEA

YUL

8h 30m

1 stop

6:45 am - 6:45 pm

YUL

SEA

15h 00m

2 stops

$367WestJet

Wed, Sep 30 - Tue, Oct 6

7:35 pm - 7:05 am

SEA

YUL

8h 30m

1 stop

6:00 pm - 10:47 pm

YUL

SEA

7h 47m

1 stop

$367Multiple Airlines

Sun, Sep 13 - Tue, Sep 22

7:35 pm - 7:05 am

SEA

YUL

8h 30m

1 stop

1:30 pm - 10:47 pm

YUL

SEA

12h 17m

2 stops

$373Multiple Airlines

Sun, Sep 13 - Tue, Sep 22

5:50 am - 6:20 pm

SEA

YUL

9h 30m

2 stops

1:30 pm - 10:47 pm

YUL

SEA

12h 17m

2 stops

$403Air Canada

Sun, Sep 13 - Tue, Sep 22

5:50 am - 5:04 pm

SEA

YUL

8h 14m

1 stop

6:00 pm - 10:47 pm

YUL

SEA

7h 47m

1 stop

$405Air Canada

Sat, Sep 5 - Sat, Sep 12

7:52 am - 3:45 pm

SEA

YYZ

4h 53mnonstop

4:55 pm - 7:13 pm

YYZ

SEA

5h 18mnonstop

$435Alaska Airlines

Sat, Sep 19 - Sat, Sep 26

8:00 am - 3:45 pm

SEA

YYZ

4h 45mnonstop

4:55 pm - 7:26 pm

YYZ

SEA

5h 31mnonstop

$436Alaska Airlines

Tue, Oct 20 - Wed, Oct 21

11:56 am - 11:52 pm

SEA

YUL

8h 56m

1 stop

12:47 pm - 10:05 pm

YUL

SEA

12h 18m

1 stop

$436Delta

Wed, Sep 2 - Sat, Sep 5

5:30 am - 4:20 pm

SEA

YUL

7h 50m

1 stop

5:10 pm - 10:05 pm

YUL

SEA

7h 55m

1 stop

$455Delta

Sun, Sep 6 - Tue, Sep 15

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WestJet flights from Seattle to Region of Ontario

Our best WestJet deals on Seattle to Region of Ontario flight tickets

WestJet

Sep 23

SEA7:35 pmSeattle/Tacoma Intl

7h 00m

1 stop

YOW5:35 amOttawa

Sep 24

YOW12:25 pmOttawa

9h 20m

2 stops

SEA6:45 pmSeattle/Tacoma Intl

$347

WestJet

Sep 30

SEA7:35 pmSeattle/Tacoma Intl

8h 30m

1 stop

YUL7:05 amMontreal Pierre Elliott Trudeau Intl

Oct 6

YUL6:45 amMontreal Pierre Elliott Trudeau Intl

15h 00m

2 stops

SEA6:45 pmSeattle/Tacoma Intl

$367

WestJet

Sep 21

SEA7:35 pmSeattle/Tacoma Intl

8h 30m

1 stop

YUL7:05 amMontreal Pierre Elliott Trudeau Intl

Sep 24

YUL6:45 amMontreal Pierre Elliott Trudeau Intl

15h 00m

2 stops

SEA6:45 pmSeattle/Tacoma Intl

$369

American Airlines flights from Seattle to Region of Ontario

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

American Airlines

Aug 14

SEA5:50 amSeattle/Tacoma Intl

9h 40m

1 stop

YYZ6:30 pmToronto Pearson Intl

Sep 13

YYZ11:40 amToronto Pearson Intl

12h 56m

1 stop

SEA9:36 pmSeattle/Tacoma Intl

$672

American Airlines

Aug 13

SEA5:50 amSeattle/Tacoma Intl

9h 40m

1 stop

YYZ6:30 pmToronto Pearson Intl

Aug 19

YYZ1:15 pmToronto Pearson Intl

13h 44m

1 stop

SEA11:59 pmSeattle/Tacoma Intl

$686

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

Wed 9/23

7:35 pm-5:35 am

1 stop7h 00m

Ottawa

Thu 9/24

12:25 pm-6:45 pm

2 stops9h 20m

$347

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Wed 9/30

7:35 pm-7:05 am

1 stop8h 30m

Montreal Pierre Elliott Trudeau Intl

Tue 10/6

6:45 am-6:45 pm

2 stops15h 00m

$367

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Sun 9/13

7:35 pm-7:05 am

1 stop8h 30m

Montreal Pierre Elliott Trudeau Intl

Tue 9/22

6:00 pm-10:47 pm

1 stop7h 47m

$367

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Sun 9/13

7:35 pm-7:05 am

1 stop8h 30m

Montreal Pierre Elliott Trudeau Intl

Tue 9/22

1:30 pm-10:47 pm

2 stops12h 17m

$373

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Sun 9/13

5:50 am-6:20 pm

2 stops9h 30m

Montreal Pierre Elliott Trudeau Intl

Tue 9/22

1:30 pm-10:47 pm

2 stops12h 17m

$403

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Sat 9/5

5:50 am-5:04 pm

1 stop8h 14m

Montreal Pierre Elliott Trudeau Intl

Sat 9/12

6:00 pm-10:47 pm

1 stop7h 47m

$405

Quickest round-trip

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 9/19

7:52 am-3:45 pm

Nonstop4h 53m

Toronto Pearson Intl

Sat 9/26

4:55 pm-7:13 pm

Nonstop5h 18m

$435

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 10/20

8:00 am-3:45 pm

Nonstop4h 45m

Toronto Pearson Intl

Wed 10/21

4:55 pm-7:26 pm

Nonstop5h 31m

$436

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Wed 9/2

11:56 am-11:52 pm

1 stop8h 56m

Montreal Pierre Elliott Trudeau Intl

Sat 9/5

12:47 pm-10:05 pm

1 stop12h 18m

$436

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Sun 9/6

5:30 am-4:20 pm

1 stop7h 50m

Montreal Pierre Elliott Trudeau Intl

Tue 9/15

5:10 pm-10:05 pm

1 stop7h 55m

$455

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 $274. If you aren’t able to travel during the month of January, then book flights to Region of Ontario from Seattle during February instead. Flights to Region of Ontario in February, while not as cheap as those in January, still average around $300.

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 $512. 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 Sunday will generally be more expensive and average around $764. 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 from Seattle to 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 $398 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 $318 on momondo.

What cabin class options are available on Seattle to Region of Ontario flights?

There are 4 cabin classes available to choose from on Seattle to Region of 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 47% 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	$293
Fastest flight time	4h 39m
Direct flights	Every day
Airports in Region of Ontario	125 airports

The best one-way flight to Region of Ontario from Seattle in the past 72 hours is $293. The best round-trip flight deal from Seattle to Region of Ontario found on momondo in the last 72 hours is $496.

The fastest flight from Seattle to Region of Ontario takes 4h 39m

Direct flights go from Seattle to Region of Ontario every day.

There are 125 airports in Region of Ontario. From Seattle there are direct flights to Toronto Pearson Intl (YYZ).

Search flight deals

Frequently asked questions about flying from Seattle to Ontario

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 August 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 A220-300, representing 59.87% of all bookings. The subsequent popular models are Boeing 737-900 Passenger/BBJ3 (winglets) at 5.64%, Boeing 777-300ER at 5.02%, and Airbus A350-900 at 4.08%.

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 Canada	PriceFrom $132	Free Cancellation	Rating 7.1 11,415 reviews	Search Air Canada flights
Delta	PriceFrom $142	Free Cancellation	Rating 7.8 8,498 reviews	Search Delta flights
WestJet	PriceFrom $228	Free Cancellation	Rating 7.2 3,423 reviews	Search WestJet flights
Alaska Airlines	PriceFrom $250	Free Cancellation	Rating 7.9 12,742 reviews	Search Alaska Airlines flights
United Airlines	PriceFrom $277	Free Cancellation	Rating 7.4 10,063 reviews	Search United 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.

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Popular cities in Ontario

Flights to Torontofrom $168

Flights to Vancouverfrom $129

Flights to Montrealfrom $227

Flights to Calgaryfrom $157

Flights to Ottawafrom $234

Flights to Halifaxfrom $278

Flights to Winnipegfrom $258

Flights to Québec Cityfrom $323

Flights to Kelownafrom $242

Flights to Saskatoonfrom $291

Flights to St. John'sfrom $355

Flights to Reginafrom $321

Cheap flights from Seattle to Ontario from $153

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 9/29. 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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WestJet flights from Seattle to Region of Ontario

Our best WestJet deals on Seattle to Region of Ontario flight tickets

American Airlines flights from Seattle to Region of Ontario

Our best American Airlines 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 from Seattle to Ontario?

What cabin class options are available on Seattle to Region of 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

Best Price Found

Fastest flight time

Direct flights

Airports in Region of Ontario

Frequently asked questions about flying from Seattle to 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

Popular cities in Ontario

Popular flights according to clicks in the last 7 days on momondo

Seattle flight routes

According to popular flight searches on momondo this year

Region of Ontario flight routes

According to popular flight searches on momondo this year

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