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 4 per day as of May 2026. The most frequent departure time is 8:00AM, with 100% 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 51% 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?

Air Canada, WestJet, 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?

28 flights are operational weekly from Seattle to Region of Ontario as of May 2026. The most popular departure day for this route is Mon, with 18% 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 May 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.

$119 Cheap Flights from Seattle to Ontario in 2026

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Cheap round-trip flights

Enter your travel dates to find the best prices.

7:35 pm - 5:20 am

SEA

YXU

6h 45m

1 stop

5:55 pm - 6:45 pm

YXU

SEA

27h 50m

1 stop

$263WestJet

Fri, Jul 17 - Mon, Jul 20

7:35 pm - 5:20 am

SEA

YXU

6h 45m

1 stop

6:10 am - 6:45 pm

YXU

SEA

15h 35m

1 stop

$270WestJet

Tue, Sep 22 - Wed, Oct 7

7:35 pm - 5:20 am

SEA

YXU

6h 45m

1 stop

6:10 am - 6:45 pm

YXU

SEA

15h 35m

1 stop

$276WestJet

Wed, Sep 23 - Wed, Oct 7

10:30 am - 11:59 pm

SEA

YYZ

10h 29m

2 stops

7:00 am - 6:45 pm

YYZ

SEA

14h 45m

1 stop

$278WestJet

Sat, May 30 - Tue, Jun 2

10:30 am - 11:59 pm

SEA

YYZ

10h 29m

2 stops

10:25 pm - 6:45 pm

YYZ

SEA

23h 20m

1 stop

$279WestJet

Fri, May 15 - Tue, May 19

7:20 pm - 8:10 am

SEA

YYZ

9h 50m

2 stops

12:30 am - 10:05 am

YYZ

SEA

12h 35m

2 stops

$282Air Canada

Fri, May 29 - Thu, Jun 4

7:20 pm - 10:12 am

SEA

YTZ

11h 52m

2 stops

8:55 pm - 10:05 am

YTZ

SEA

16h 10m

2 stops

$324Air Canada

Fri, May 29 - Fri, Jun 5

10:40 pm - 10:06 am

SEA

YTZ

8h 26m

1 stop

12:15 pm - 7:06 pm

YTZ

SEA

9h 51m

1 stop

$445United Airlines

Tue, Jun 2 - Thu, Jun 4

7:35 pm - 7:00 pm

SEA

YQT

20h 25m

1 stop

11:35 am - 6:45 pm

YQT

SEA

34h 10m

3 stops

$474Multiple Airlines

Wed, Jul 15 - Sun, Jul 19

7:35 pm - 5:20 am

SEA

YXU

6h 45m

1 stop

2:40 pm - 9:40 am

YXU

SEA

22h 00m

3 stops

$483Multiple Airlines

Fri, Jun 5 - Fri, Jun 12

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 29

SEA7:20 pmSeattle/Tacoma Intl

9h 50m

2 stops

YYZ8:10 amToronto Pearson Intl

Jun 4

YYZ12:30 amToronto Pearson Intl

12h 35m

2 stops

SEA10:05 amSeattle/Tacoma Intl

$282

Air Canada

May 29

SEA7:20 pmSeattle/Tacoma Intl

11h 52m

2 stops

YTZ10:12 amToronto Island

Jun 5

YTZ8:55 pmToronto Island

16h 10m

2 stops

SEA10:05 amSeattle/Tacoma Intl

$324

Air Canada

May 29

SEA7:20 pmSeattle/Tacoma Intl

11h 52m

2 stops

YTZ10:12 amToronto Island

Jun 5

YTZ8:55 pmToronto Island

16h 10m

2 stops

SEA10:05 amSeattle/Tacoma Intl

$332

WestJet flights from Seattle to Region of Ontario

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

WestJet

Jul 17

SEA7:35 pmSeattle/Tacoma Intl

6h 45m

1 stop

YXU5:20 amLondon

Jul 20

YXU5:55 pmLondon

27h 50m

1 stop

SEA6:45 pmSeattle/Tacoma Intl

$263

WestJet

Sep 22

SEA7:35 pmSeattle/Tacoma Intl

6h 45m

1 stop

YXU5:20 amLondon

Oct 7

YXU6:10 amLondon

15h 35m

1 stop

SEA6:45 pmSeattle/Tacoma Intl

$270

WestJet

Sep 23

SEA7:35 pmSeattle/Tacoma Intl

6h 45m

1 stop

YXU5:20 amLondon

Oct 7

YXU6:10 amLondon

15h 35m

1 stop

SEA6:45 pmSeattle/Tacoma Intl

$276

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Fri 7/17

7:35 pm-5:20 am

1 stop6h 45m

London

Mon 7/20

5:55 pm-6:45 pm

1 stop27h 50m

$263

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Tue 9/22

7:35 pm-5:20 am

1 stop6h 45m

London

Wed 10/7

6:10 am-6:45 pm

1 stop15h 35m

$270

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Wed 9/23

7:35 pm-5:20 am

1 stop6h 45m

London

Wed 10/7

6:10 am-6:45 pm

1 stop15h 35m

$276

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 5/30

10:30 am-11:59 pm

2 stops10h 29m

Toronto Pearson Intl

Tue 6/2

7:00 am-6:45 pm

1 stop14h 45m

$278

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 5/15

10:30 am-11:59 pm

2 stops10h 29m

Toronto Pearson Intl

Tue 5/19

10:25 pm-6:45 pm

1 stop23h 20m

$279

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 5/29

7:20 pm-8:10 am

2 stops9h 50m

Toronto Pearson Intl

Thu 6/4

12:30 am-10:05 am

2 stops12h 35m

$282

SeattleToronto

SEA - YTZ

SEAYTZ

Seattle/Tacoma Intl

Fri 5/29

7:20 pm-10:12 am

2 stops11h 52m

Toronto Island

Fri 6/5

8:55 pm-10:05 am

2 stops16h 10m

$324

Quickest round-trip

SeattleToronto

SEA - YTZ

SEAYTZ

Seattle/Tacoma Intl

Tue 6/2

10:40 pm-10:06 am

1 stop8h 26m

Toronto Island

Thu 6/4

12:15 pm-7:06 pm

1 stop9h 51m

$445

SeattleThunder Bay

SEA - YQT

SEAYQT

Seattle/Tacoma Intl

Wed 7/15

7:35 pm-7:00 pm

1 stop20h 25m

Thunder Bay

Sun 7/19

11:35 am-6:45 pm

3 stops34h 10m

$474

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Fri 6/5

7:35 pm-5:20 am

1 stop6h 45m

London

Fri 6/12

2:40 pm-9:40 am

3 stops22h 00m

$483

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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 November is, on average, the cheapest month to fly to Region of Ontario from Seattle, with most prices found around $88. If you aren’t able to travel during the month of November, 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 November, still average around $93.

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 $500. 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 $710. 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 $386 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 $308 on momondo.

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

You could potentially save up to 24% 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	$303
Fastest flight time	4h 43m
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 $303. The best round-trip flight deal from Seattle to Region of Ontario found on momondo in the last 72 hours is $480.

The fastest flight from Seattle to Region of Ontario takes 4h 43m

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

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 May 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 Boeing 737 MAX 8, representing 13.90% of all bookings. The subsequent popular models are Airbus A330-200 at 13.51%, Airbus A220-300 at 10.04%, and Airbus A330-900neo at 9.65%.

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 7.9 8,460 reviews	Search Delta flights
Air Canada	PriceFrom $150	Free Cancellation	Rating 7.1 10,993 reviews	Search Air Canada flights
WestJet	PriceFrom $216	Free Cancellation	Rating 7.2 3,331 reviews	Search WestJet flights
United Airlines	PriceFrom $238	Free Cancellation	Rating 7.4 9,684 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $251	Free Cancellation	Rating 7.9 12,320 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.

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Popular cities in Ontario

Flights to Torontofrom $144

Flights to Vancouverfrom $139

Flights to Montrealfrom $206

Flights to Calgaryfrom $184

Flights to Ottawafrom $215

Flights to Halifaxfrom $220

Flights to Winnipegfrom $267

Flights to Québec Cityfrom $371

Flights to Saskatoonfrom $211

Flights to Kelownafrom $233

Flights to St. John'sfrom $312

Flights to Reginafrom $319

Cheap flights from Seattle to Ontario from $119

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 6/1. 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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Air Canada flights from Seattle to Region of Ontario

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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?

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

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

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