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 45% 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, WestJet, and Air Canada 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?

23 flights are operational weekly from Seattle to Region of Ontario as of November 2026. The most popular departure day for this route is Mon, with 22% 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 November 2026. The most frequent departure time is 7:00AM, with 88% 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 November 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.

$174 Cheap Flights from Seattle to Ontario in 2026/27

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.

2:20 pm - 5:45 amSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

12h 25m2 stops Calgary Edmonton

7:00 am - 1:40 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

9h 40m2 stops Edmonton Calgary

$397WestJet

Sat, Jan 23 - Wed, Jan 27

2:30 pm - 5:45 amSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

12h 15m2 stops Calgary Edmonton

7:30 am - 1:40 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

9h 10m1 stop Calgary

$398WestJet

Fri, Jan 15 - Tue, Jan 19

8:33 am - 9:51 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

10h 18m1 stop Austin Bergstrom

6:10 am - 1:40 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

10h 30m1 stop Calgary

$411Multiple Airlines

Mon, Dec 14 - Mon, Dec 21

4:58 pm - 9:55 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

25h 57m2 stops Denver Intl Orlando

7:30 am - 1:40 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

9h 10m1 stop Calgary

$416Multiple Airlines

Wed, Dec 16 - Tue, Jan 5

9:15 am - 10:59 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

10h 44m2 stops Austin Bergstrom Detroit Metropolitan Wayne County

9:45 am - 7:04 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

12h 19m2 stops Detroit Metropolitan Wayne County Austin Bergstrom

$465Delta

Thu, Jan 21 - Wed, Jan 27

8:33 am - 4:05 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 32mnonstop

5:15 pm - 8:13 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 58mnonstop

$468Alaska Airlines

Tue, Dec 1 - Mon, Dec 21

8:33 am - 4:05 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 32mnonstop

5:15 pm - 7:56 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 41mnonstop

$482Alaska Airlines

Sat, Dec 5 - Sat, Dec 12

9:35 am - 12:01 amSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

11h 26m2 stops Austin Bergstrom Atlanta Hartsfield-Jackson

5:15 pm - 10:05 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

7h 50m1 stop Detroit Metropolitan Wayne County

$488Delta

Sat, Feb 20 - Sat, Feb 27

10:10 am - 11:11 pmSEA Seattle/Tacoma Intl-YOW Ottawa

10h 01m2 stops Vancouver Intl Calgary

7:50 am - 6:22 pmYOW Ottawa-SEA Seattle/Tacoma Intl

13h 32m2 stops Calgary Vancouver Intl

$512Air Canada

Fri, Jan 15 - Tue, Jan 19

8:40 am - 11:11 pmSEA Seattle/Tacoma Intl-YOW Ottawa

11h 31m2 stops Vancouver Intl Calgary

5:10 am - 8:59 pmYOW Ottawa-SEA Seattle/Tacoma Intl

18h 49m1 stop Toronto Pearson Intl

$523Air Canada

Sun, Nov 29 - Sun, Dec 6

Cheap last minute flights

Enter your travel dates to find the best prices.

4:27 pm - 1:40 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

42h 13m2 stops Denver Intl Orlando

6:10 am - 1:40 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

10h 30m1 stop Calgary

$668Multiple Airlines

Wed, Nov 4 - Wed, Nov 18

4:27 pm - 9:43 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

26h 16m2 stops Denver Intl San Francisco

6:10 am - 1:40 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

10h 30m1 stop Calgary

$691Multiple Airlines

Mon, Nov 9 - Wed, Nov 18

8:58 pm - 11:09 amSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

11h 11m2 stops Portland Atlanta Hartsfield-Jackson

6:00 am - 11:09 amYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

8h 09m1 stop Detroit Metropolitan Wayne County

$866Delta

Mon, Nov 9 - Tue, Nov 17

8:58 pm - 11:19 amSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

11h 21m2 stops Portland Detroit Metropolitan Wayne County

7:35 am - 3:25 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

10h 50m2 stops Atlanta Hartsfield-Jackson Portland

$883Delta

Mon, Nov 9 - Tue, Nov 17

2:30 pm - 2:25 pmSEA Seattle/Tacoma Intl-YHM Hamilton

20h 55m1 stop Calgary

3:25 pm - 1:40 pmYHM Hamilton-SEA Seattle/Tacoma Intl

25h 15m1 stop Calgary

$897WestJet

Mon, Nov 9 - Thu, Nov 19

9:45 pm - 5:45 amSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

29h 00m1 stop Vancouver Intl

9:40 am - 10:16 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

15h 36m1 stop Detroit Metropolitan Wayne County

$929WestJet

Fri, Nov 6 - Sun, Nov 8

7:45 am - 3:25 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 40mnonstop

6:25 pm - 8:59 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 34mnonstop

$958Air Canada

Sat, Nov 7 - Sun, Nov 15

7:45 am - 3:25 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 40mnonstop

6:25 pm - 8:59 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 34mnonstop

$958Air Canada

Mon, Nov 9 - Thu, Nov 19

8:19 am - 4:05 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 46mnonstop

5:15 pm - 7:45 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 30mnonstop

$1,007Alaska Airlines

Mon, Nov 9 - Tue, Nov 17

11:42 pm - 10:50 amSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

8h 08m1 stop Chicago O'Hare Intl

5:15 pm - 7:45 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 30mnonstop

$1,016Alaska Airlines

Mon, Nov 9 - Tue, Nov 17

Cheap direct flights

Enter your travel dates to find the best prices.

8:33 am - 4:05 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 32mnonstop

5:15 pm - 8:13 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 58mnonstop

$468Alaska Airlines

Tue, Dec 1 - Mon, Dec 21

8:33 am - 4:05 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 32mnonstop

5:15 pm - 7:56 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 41mnonstop

$482Alaska Airlines

Sat, Dec 5 - Sat, Dec 12

8:21 am - 4:05 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 44mnonstop

5:15 pm - 7:43 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 28mnonstop

$482Alaska Airlines

Tue, Mar 2 - Wed, Mar 3

8:33 am - 4:05 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 32mnonstop

6:25 pm - 8:59 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 34mnonstop

$546Multiple Airlines

Mon, Dec 14 - Mon, Dec 21

8:29 am - 4:05 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 36mnonstop

6:25 pm - 8:59 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 34mnonstop

$576Multiple Airlines

Wed, Feb 3 - Sun, Feb 14

8:31 am - 4:05 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 34mnonstop

6:25 pm - 8:59 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 34mnonstop

$597Multiple Airlines

Mon, Nov 30 - Wed, Dec 2

7:45 am - 3:25 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 40mnonstop

6:25 pm - 8:59 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 34mnonstop

$656Air Canada

Mon, Nov 16 - Sun, Nov 22

7:45 am - 3:25 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 40mnonstop

6:25 pm - 8:59 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 34mnonstop

$678Air Canada

Tue, Dec 29 - Thu, Jan 7

7:45 am - 3:25 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 40mnonstop

6:25 pm - 8:59 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 34mnonstop

$862United Airlines

Sat, Dec 19 - Sun, Jan 3

7:45 am - 3:25 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 40mnonstop

6:25 pm - 8:59 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 34mnonstop

$1,077United Airlines

Fri, Dec 25 - Thu, Dec 31

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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

Jan 23

SEA2:20 pmSeattle/Tacoma Intl

12h 25m

2 stops

YYZ5:45 amToronto Pearson Intl

Jan 27

YYZ7:00 amToronto Pearson Intl

9h 40m

2 stops

SEA1:40 pmSeattle/Tacoma Intl

$397

WestJet

Jan 15

SEA2:30 pmSeattle/Tacoma Intl

12h 15m

2 stops

YYZ5:45 amToronto Pearson Intl

Jan 19

YYZ7:30 amToronto Pearson Intl

9h 10m

1 stop

SEA1:40 pmSeattle/Tacoma Intl

$398

WestJet

Dec 1

SEA2:30 pmSeattle/Tacoma Intl

12h 15m

2 stops

YYZ5:45 amToronto Pearson Intl

Dec 21

YYZ6:10 amToronto Pearson Intl

10h 30m

1 stop

SEA1:40 pmSeattle/Tacoma Intl

$399

Air Canada flights from Seattle to Region of Ontario

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

Air Canada

Jan 15

SEA10:10 amSeattle/Tacoma Intl

10h 01m

2 stops

YOW11:11 pmOttawa

Jan 19

YOW7:50 amOttawa

13h 32m

2 stops

SEA6:22 pmSeattle/Tacoma Intl

$512

Air Canada

Nov 29

SEA8:40 amSeattle/Tacoma Intl

11h 31m

2 stops

YOW11:11 pmOttawa

Dec 6

YOW5:10 amOttawa

18h 49m

1 stop

SEA8:59 pmSeattle/Tacoma Intl

$523

Air Canada

Nov 29

SEA8:40 amSeattle/Tacoma Intl

11h 31m

2 stops

YOW11:11 pmOttawa

Dec 6

YOW7:50 pmOttawa

25h 32m

2 stops

SEA6:22 pmSeattle/Tacoma Intl

$540

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Sat 1/23

2:20 pm-5:45 am

2 stops12h 25m

Toronto Pearson Intl

Wed 1/27

7:00 am-1:40 pm

2 stops9h 40m

$397

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Fri 1/15

2:30 pm-5:45 am

2 stops12h 15m

Toronto Pearson Intl

Tue 1/19

7:30 am-1:40 pm

1 stop9h 10m

$398

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Mon 12/14

8:33 am-9:51 pm

1 stop10h 18m

Toronto Pearson Intl

Mon 12/21

6:10 am-1:40 pm

1 stop10h 30m

$411

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Wed 12/16

4:58 pm-9:55 pm

2 stops25h 57m

Toronto Pearson Intl

Tue 1/5

7:30 am-1:40 pm

1 stop9h 10m

$416

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Thu 1/21

9:15 am-10:59 pm

2 stops10h 44m

Toronto Pearson Intl

Wed 1/27

9:45 am-7:04 pm

2 stops12h 19m

$465

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Tue 12/1

8:33 am-4:05 pm

Nonstop4h 32m

Toronto Pearson Intl

Mon 12/21

5:15 pm-8:13 pm

Nonstop5h 58m

$468

Quickest round-trip

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Sat 12/5

8:33 am-4:05 pm

Nonstop4h 32m

Toronto Pearson Intl

Sat 12/12

5:15 pm-7:56 pm

Nonstop5h 41m

$482

SeattleToronto

SEA Seattle/Tacoma Intl - YYZ Toronto Pearson Intl

SEAYYZ

Seattle/Tacoma Intl

Sat 2/20

9:35 am-12:01 am

2 stops11h 26m

Toronto Pearson Intl

Sat 2/27

5:15 pm-10:05 pm

1 stop7h 50m

$488

SeattleOttawa

SEA Seattle/Tacoma Intl - YOW Ottawa

SEAYOW

Seattle/Tacoma Intl

Fri 1/15

10:10 am-11:11 pm

2 stops10h 01m

Ottawa

Tue 1/19

7:50 am-6:22 pm

2 stops13h 32m

$512

SeattleOttawa

SEA Seattle/Tacoma Intl - YOW Ottawa

SEAYOW

Seattle/Tacoma Intl

Sun 11/29

8:40 am-11:11 pm

2 stops11h 31m

Ottawa

Sun 12/6

5:10 am-8:59 pm

1 stop18h 49m

$523

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 $278. If you aren’t able to travel during the month of January, then book flights to Region of Ontario from Seattle during March instead. Flights to Region of Ontario in March, while not as cheap as those in January, still average around $310.

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 $566. 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 $780. 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 $445 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?

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	$174
Fastest flight time	4h 32m
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 $174. The best round-trip flight deal from Seattle to Region of Ontario found on momondo in the last 72 hours is $397.

The fastest flight from Seattle to Region of Ontario takes 4h 32m

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 November 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 14.67% of all bookings. The subsequent popular models are Airbus A330-200 at 11.58%, Boeing 787-10 Dreamliner at 7.34%, and Airbus A321neo at 6.95%.

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 $142	Free Cancellation	Rating 7.8 8,696 reviews	Search Delta flights
Air Canada	PriceFrom $162	Free Cancellation	Rating 7.1 11,852 reviews	Search Air Canada flights
WestJet	PriceFrom $240	Free Cancellation	Rating 7.2 3,441 reviews	Search WestJet flights
Alaska Airlines	PriceFrom $245	Free Cancellation	Rating 7.9 13,138 reviews	Search Alaska Airlines flights
United Airlines	PriceFrom $277	Free Cancellation	Rating 7.3 10,460 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.

An easier way to manage your Region of Ontario trip

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Popular cities in Ontario

Flights to Torontofrom $147

Flights to Vancouverfrom $129

Flights to Montrealfrom $176

Flights to Calgaryfrom $111

Flights to Ottawafrom $181

Flights to Halifaxfrom $323

Flights to Winnipegfrom $313

Flights to Québec Cityfrom $428

Flights to Kelownafrom $260

Flights to St. John'sfrom $423

Flights to Saskatoonfrom $345

Flights to Reginafrom $331

Cheap flights from Seattle to Ontario from $174

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 12/14. 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

Air Canada flights from Seattle to Region of Ontario

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

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Use the filters below to find and compare flights from Seattle to Ontario that are best for you.

See travel insights to Ontario from

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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