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

As of December 2025, there are 2 flights per day flying from Seattle to Region of Ontario. The most common time of day flights depart is 7:00a.m., with 100% of flights taking off at noon.

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

Air Canada, United Airlines, and WestJet 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 18 per week as of December 2025. The most frequent departure day is Wed, with 33% of weekly flights leaving on this day.

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 55% of people opting to fly with this airline when travelling to Region of Ontario. Keep in mind that there are 4 different airlines that fly to Region of Ontario on a routine basis, so you have a few additional options to choose from.

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 4 as of December 2025.

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$ 142 Cheap Flights from Seattle to Ontario in 2025/26

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Find the cheapest flights from Seattle to Ontario

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One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

11:55 a.m. - 11:38 p.m.

SEA

YYZ

8h 43m2 stops

4:45 p.m. - 7:18 p.m.

YYZ

SEA

5h 33mdirect

C$ 338Multiple Airlines

Fri, 27 Feb - Fri, 6 Mar

7:05 a.m. - 6:52 p.m.

SEA

YYZ

8h 47m1 stop

6:30 a.m. - 1:08 p.m.

YYZ

SEA

9h 38m1 stop

C$ 339WestJet

Mon, 25 May - Fri, 29 May

7:55 a.m. - 3:35 p.m.

SEA

YYZ

4h 40mdirect

4:45 p.m. - 7:18 p.m.

YYZ

SEA

5h 33mdirect

C$ 340Alaska Airlines

Sun, 22 Feb - Thu, 5 Mar

3:10 p.m. - 5:58 a.m.

SEA

YYZ

11h 48m2 stops

6:45 a.m. - 1:08 p.m.

YYZ

SEA

9h 23m2 stops

C$ 342WestJet

Fri, 24 Apr - Mon, 27 Apr

3:35 p.m. - 5:50 a.m.

SEA

YYZ

11h 15m2 stops

12:00 p.m. - 8:28 p.m.

YYZ

SEA

11h 28m2 stops

C$ 343WestJet

Sun, 26 Apr - Fri, 1 May

2:05 p.m. - 12:42 a.m.

SEA

YUL

7h 37m1 stop

6:45 a.m. - 1:08 p.m.

YUL

SEA

9h 23m1 stop

C$ 343WestJet

Sun, 26 Apr - Wed, 29 Apr

8:10 a.m. - 3:53 p.m.

SEA

YYZ

4h 43mdirect

7:50 p.m. - 10:16 p.m.

YYZ

SEA

5h 26mdirect

C$ 347Air Canada

Wed, 18 Feb - Wed, 18 Feb

8:00 p.m. - 8:46 a.m.

SEA

YXU

9h 46m2 stops

5:40 p.m. - 10:16 p.m.

YXU

SEA

7h 36m1 stop

C$ 390Air Canada

Thu, 22 Jan - Mon, 26 Jan

12:35 p.m. - 5:05 p.m.

SEA

YXU

25h 30m3 stops

5:10 a.m. - 10:43 p.m.

YXU

SEA

20h 33m2 stops

C$ 543United Airlines

Fri, 30 Jan - Fri, 6 Feb

12:57 p.m. - 5:05 p.m.

SEA

YXU

25h 08m3 stops

9:25 a.m. - 10:43 p.m.

YXU

SEA

16h 18m3 stops

C$ 551United Airlines

Fri, 30 Jan - Fri, 6 Feb

WestJet flights from Seattle to Region of Ontario

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

WestJet

25 May

SEA7:05 a.m.Seattle/Tacoma Intl

8h 47m

1 stop

YYZ6:52 p.m.Toronto Pearson Intl

29 May

YYZ6:30 a.m.Toronto Pearson Intl

9h 38m

1 stop

SEA1:08 p.m.Seattle/Tacoma Intl

C$ 339

Find similar

WestJet

24 Apr

SEA3:10 p.m.Seattle/Tacoma Intl

11h 48m

2 stops

YYZ5:58 a.m.Toronto Pearson Intl

29 Apr

YYZ12:00 p.m.Toronto Pearson Intl

11h 28m

2 stops

SEA8:28 p.m.Seattle/Tacoma Intl

C$ 342

Find similar

WestJet

26 Apr

SEA3:35 p.m.Seattle/Tacoma Intl

11h 15m

2 stops

YYZ5:50 a.m.Toronto Pearson Intl

1 May

YYZ12:00 p.m.Toronto Pearson Intl

11h 28m

2 stops

SEA8:28 p.m.Seattle/Tacoma Intl

C$ 343

Find similar

Alaska Airlines flights from Seattle to Region of Ontario

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

Alaska Airlines

22 Feb

SEA7:55 a.m.Seattle/Tacoma Intl

4h 40m

YYZ3:35 p.m.Toronto Pearson Intl

1 Mar

YYZ4:45 p.m.Toronto Pearson Intl

5h 33m

SEA7:18 p.m.Seattle/Tacoma Intl

C$ 340

Find similar

Alaska Airlines

25 Apr

SEA7:55 a.m.Seattle/Tacoma Intl

4h 40m

YYZ3:35 p.m.Toronto Pearson Intl

29 Apr

YYZ4:45 p.m.Toronto Pearson Intl

5h 20m

SEA7:05 p.m.Seattle/Tacoma Intl

C$ 408

Find similar

Alaska Airlines

30 Dec

SEA8:00 a.m.Seattle/Tacoma Intl

4h 35m

YYZ3:35 p.m.Toronto Pearson Intl

9 Jan

YYZ4:45 p.m.Toronto Pearson Intl

5h 32m

SEA7:17 p.m.Seattle/Tacoma Intl

C$ 818

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 27/2

11:55 a.m.-11:38 p.m.

2 stops8h 43m

Toronto Pearson Intl

Fri 6/3

4:45 p.m.-7:18 p.m.

Nonstop5h 33m

C$ 338

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Mon 25/5

7:05 a.m.-6:52 p.m.

1 stop8h 47m

Toronto Pearson Intl

Fri 29/5

6:30 a.m.-1:08 p.m.

1 stop9h 38m

C$ 339

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sun 22/2

7:55 a.m.-3:35 p.m.

Nonstop4h 40m

Toronto Pearson Intl

Thu 5/3

4:45 p.m.-7:18 p.m.

Nonstop5h 33m

C$ 340

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 24/4

3:10 p.m.-5:58 a.m.

2 stops11h 48m

Toronto Pearson Intl

Mon 27/4

6:45 a.m.-1:08 p.m.

2 stops9h 23m

C$ 342

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sun 26/4

3:35 p.m.-5:50 a.m.

2 stops11h 15m

Toronto Pearson Intl

Fri 1/5

12:00 p.m.-8:28 p.m.

2 stops11h 28m

C$ 343

SeattleMontreal

SEA - YUL

SEAYUL

Seattle/Tacoma Intl

Sun 26/4

2:05 p.m.-12:42 a.m.

1 stop7h 37m

Montreal Pierre Elliott Trudeau Intl

Wed 29/4

6:45 a.m.-1:08 p.m.

1 stop9h 23m

C$ 343

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 18/2

8:10 a.m.-3:53 p.m.

Nonstop4h 43m

Toronto Pearson Intl

Wed 18/2

7:50 p.m.-10:16 p.m.

Nonstop5h 26m

C$ 347

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Thu 22/1

8:00 p.m.-8:46 a.m.

2 stops9h 46m

London

Mon 26/1

5:40 p.m.-10:16 p.m.

1 stop7h 36m

C$ 390

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Fri 30/1

12:35 p.m.-5:05 p.m.

3 stops25h 30m

London

Fri 6/2

5:10 a.m.-10:43 p.m.

2 stops20h 33m

C$ 543

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Fri 30/1

12:57 p.m.-5:05 p.m.

3 stops25h 08m

London

Fri 6/2

9:25 a.m.-10:43 p.m.

3 stops16h 18m

C$ 551

Flights are sorted by cheapest round-trip flights first.

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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?

In general, November 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$ 378. If you are unable to visit Region of Ontario during the month of November, then departing from Seattle during the month January is also very affordable. Most momondo users find prices during this month for around C$ 390.

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$ 535. The most expensive day to fly to Region of Ontario is Monday, with ticket prices averaging around C$ 971.

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

Our most recent data shows that the best time of day to fly to Region of Ontario is in the afternoon. Flights from Seattle to Region of Ontario during this time can be as low as C$ 492. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are C$ 814 on average. Flights to Region of Ontario from Seattle in the morning are generally more expensive because this time of day is more convenient for travellers’ schedules.

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$ 569 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$ 402 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.

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	C$ 241
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 C$ 241. The best round-trip flight deal from Seattle to Region of Ontario found on momondo in the last 72 hours is C$ 365.

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 Montreal Pierre Elliott Trudeau Intl (YUL), 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 4 as of December 2025.
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 A220-300 (65.74% of total bookings). The next most popular plane models are Boeing 787-9 Dreamliner (4.58%), Airbus A330-200 (3.39%), and Boeing 737 MAX 8 (2.99%).

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$ 284	Free Cancellation	Rating 7.2 3,204 reviews	Search WestJet flights
Air Canada	PriceFrom C$ 364	Free Cancellation	Rating 7.1 10,534 reviews	Search Air Canada flights
Alaska Airlines	PriceFrom C$ 375	Free Cancellation	Rating 8.0 11,478 reviews	Search Alaska Airlines flights
United Airlines	PriceFrom C$ 486	Free Cancellation	Rating 7.4 9,093 reviews	Search United Airlines 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.

An easier way to manage your Region of Ontario trip

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Find better results for your trip to Ontario

Popular Cities in Ontario

Flights to Torontofrom C$ 81

Flights to Vancouverfrom C$ 68

Flights to Montrealfrom C$ 59

Flights to Calgaryfrom C$ 74

Flights to Ottawafrom C$ 185

Flights to Winnipegfrom C$ 121

Flights to Halifaxfrom C$ 77

Flights to Kelownafrom C$ 65

Flights to Saskatoonfrom C$ 132

Flights to Reginafrom C$ 145

Flights to St. John'sfrom C$ 306

Flights to Québec Cityfrom C$ 329

Cheap flights from Seattle to Ontario from C$ 142

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 22/2. 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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Big names, great deals

Filter for what you want

Filter for what you want

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Find the cheapest flights from Seattle to Ontario

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WestJet flights from Seattle to Region of Ontario

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

Alaska Airlines flights from Seattle to Region of Ontario

Our best Alaska 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 time of day to depart on your flight to Region of Ontario?

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?

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.

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

Air Canada, United Airlines, and WestJet are the most popular carriers operating from Seattle/Tacoma Intl to Ontario

Which airlines fly to Region of Ontario?

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

As of December 2025, there are 2 flights per day flying from Seattle to Region of Ontario. The most common time of day flights depart is 7:00a.m., with 100% of flights taking off at noon.

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 18 per week as of December 2025. The most frequent departure day is Wed, with 33% of weekly flights leaving on this day.

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

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Ontario?

How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Ontario?

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

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

What is the most popular plane model from Seattle to 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?

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

Can I find flights from Seattle to Ontario with flexible booking policies on momondo?

How can momondo help me find flights from Seattle to Ontario?

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

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