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

The number of flights available between Region of Ontario and Seattle is 4 per day as of February 2026. The most frequent departure time is 4:00p.m., with 51% of daily flights leaving in the afternoon.

Which airlines fly to Seattle?

Alaska Airlines, Air Canada and WestJet are the top three most popular airlines that fly to Seattle from Region of Ontario according to our data. Alaska Airlines is the first choice among our users, with 34% of people opting to fly with this airline when travelling to Seattle. Keep in mind that there are 6 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

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

The number of flights available between Region of Ontario and Seattle is 29 per week as of February 2026. The most frequent departure day is Thu, with 21% of weekly flights leaving on this day.

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

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

How long does it take to fly to Seattle?

Flight times from Region of Ontario to Seattle vary, but if you’re flying out of Toronto and flying into Seattle (one of the most popular routes), then the duration is 8h 09m on average. Another popular route from Region of Ontario to Seattle is flying from Ottawa to Seattle, which will take roughly 8h 25m. Keep in mind that layovers or delays could extend your travel time.

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

Prices for flights from Ontario to Seattle/Tacoma Intl Airport are updated daily.

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

The number of operators available for flights from Ontario to Seattle/Tacoma Intl Airport is 7 as of February 2026.

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

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 Ontario to Seattle/Tacoma Intl Airport.

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

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

C$ 186 Cheap Flights from Ontario to Seattle in 2026

1 adult

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Find the cheapest flights from Ontario to Seattle

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:30 a.m. - 2:19 p.m.

YYZ

SEA

10h 49m

1 stop

7:35 p.m. - 6:55 a.m.

SEA

YYZ

8h 20m

1 stop

C$ 279WestJet

Fri, 24 Apr - Wed, 29 Apr

6:30 a.m. - 2:19 p.m.

YYZ

SEA

10h 49m

1 stop

7:35 p.m. - 5:45 a.m.

SEA

YYZ

7h 10m

1 stop

C$ 282WestJet

Fri, 24 Apr - Wed, 29 Apr

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

YYZ

SEA

5h 33mdirect

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

SEA

YYZ

4h 40mdirect

C$ 303Alaska Airlines

Tue, 17 Mar - Wed, 25 Mar

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

YYZ

SEA

5h 33mdirect

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

SEA

YYZ

4h 40mdirect

C$ 304Alaska Airlines

Wed, 11 Mar - Wed, 25 Mar

7:45 a.m. - 2:19 p.m.

YYZ

SEA

9h 34m

1 stop

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

SEA

YYZ

11h 48m

2 stops

C$ 305WestJet

Wed, 11 Mar - Sun, 15 Mar

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

YYZ

SEA

5h 33mdirect

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

SEA

YYZ

4h 40mdirect

C$ 315Alaska Airlines

Mon, 16 Mar - Wed, 25 Mar

7:45 a.m. - 2:19 p.m.

YYZ

SEA

9h 34m

1 stop

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

SEA

YYZ

11h 48m

2 stops

C$ 316WestJet

Tue, 10 Mar - Thu, 12 Mar

7:45 a.m. - 2:19 p.m.

YYZ

SEA

9h 34m

1 stop

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

SEA

YYZ

4h 40mdirect

C$ 318Multiple Airlines

Wed, 11 Mar - Tue, 17 Mar

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

YYZ

SEA

5h 26mdirect

3:40 p.m. - 5:38 a.m.

SEA

YYZ

10h 58m

2 stops

C$ 319Air Canada

Wed, 11 Mar - Wed, 25 Mar

8:30 p.m. - 3:05 p.m.

YTZ

SEA

21h 35m

2 stops

8:00 p.m. - 10:25 a.m.

SEA

YTZ

11h 25m

2 stops

C$ 367Air Canada

Tue, 7 Apr - Tue, 14 Apr

WestJet flights from Region of Ontario to Seattle

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

WestJet

24 Apr

YYZ6:30 a.m.Toronto Pearson Intl

10h 49m

1 stop

SEA2:19 p.m.Seattle/Tacoma Intl

29 Apr

SEA7:35 p.m.Seattle/Tacoma Intl

8h 20m

1 stop

YYZ6:55 a.m.Toronto Pearson Intl

C$ 279

WestJet

24 Apr

YYZ6:30 a.m.Toronto Pearson Intl

10h 49m

1 stop

SEA2:19 p.m.Seattle/Tacoma Intl

29 Apr

SEA7:35 p.m.Seattle/Tacoma Intl

7h 10m

1 stop

YYZ5:45 a.m.Toronto Pearson Intl

C$ 282

WestJet

11 Mar

YYZ7:45 a.m.Toronto Pearson Intl

9h 34m

1 stop

SEA2:19 p.m.Seattle/Tacoma Intl

15 Mar

SEA3:10 p.m.Seattle/Tacoma Intl

11h 48m

2 stops

YYZ5:58 a.m.Toronto Pearson Intl

C$ 305

Air Canada flights from Region of Ontario to Seattle

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

Air Canada

11 Mar

YYZ7:50 p.m.Toronto Pearson Intl

5h 26m

SEA10:16 p.m.Seattle/Tacoma Intl

25 Mar

SEA3:40 p.m.Seattle/Tacoma Intl

10h 58m

2 stops

YYZ5:38 a.m.Toronto Pearson Intl

C$ 319

Air Canada

28 Apr

YYZ7:30 p.m.Toronto Pearson Intl

5h 23m

SEA9:53 p.m.Seattle/Tacoma Intl

30 Apr

SEA5:40 a.m.Seattle/Tacoma Intl

9h 15m

1 stop

YYZ5:55 p.m.Toronto Pearson Intl

C$ 322

Air Canada

16 Mar

YYZ10:35 p.m.Toronto Pearson Intl

14h 00m

1 stop

SEA9:35 a.m.Seattle/Tacoma Intl

24 Mar

SEA8:00 a.m.Seattle/Tacoma Intl

4h 43m

YYZ3:43 p.m.Toronto Pearson Intl

C$ 331

Fly from

Fly to

Route

Depart

Return

Price

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Fri 24/4

6:30 a.m.-2:19 p.m.

1 stop10h 49m

Seattle/Tacoma Intl

Wed 29/4

7:35 p.m.-6:55 a.m.

1 stop8h 20m

C$ 279

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Fri 24/4

6:30 a.m.-2:19 p.m.

1 stop10h 49m

Seattle/Tacoma Intl

Wed 29/4

7:35 p.m.-5:45 a.m.

1 stop7h 10m

C$ 282

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 17/3

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

Nonstop5h 33m

Seattle/Tacoma Intl

Wed 25/3

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

Nonstop4h 40m

C$ 302

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 11/3

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

Nonstop5h 33m

Seattle/Tacoma Intl

Wed 25/3

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

Nonstop4h 40m

C$ 304

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 11/3

7:45 a.m.-2:19 p.m.

1 stop9h 34m

Seattle/Tacoma Intl

Sun 15/3

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

2 stops11h 48m

C$ 305

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Mon 16/3

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

Nonstop5h 33m

Seattle/Tacoma Intl

Wed 25/3

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

Nonstop4h 40m

C$ 315

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 10/3

7:45 a.m.-2:19 p.m.

1 stop9h 34m

Seattle/Tacoma Intl

Thu 12/3

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

2 stops11h 48m

C$ 316

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 11/3

7:45 a.m.-2:19 p.m.

1 stop9h 34m

Seattle/Tacoma Intl

Tue 17/3

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

Nonstop4h 40m

C$ 318

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Wed 11/3

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

Nonstop5h 26m

Seattle/Tacoma Intl

Wed 25/3

3:40 p.m.-5:38 a.m.

2 stops10h 58m

C$ 319

TorontoSeattle

YTZ - SEA

YTZSEA

Toronto Island

Tue 7/4

8:30 p.m.-3:05 p.m.

2 stops21h 35m

Seattle/Tacoma Intl

Tue 14/4

8:00 p.m.-10:25 a.m.

2 stops11h 25m

C$ 367

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Showing 1-10 of 20 resultsSorted by cheapest first

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

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 Seattle?

If you aren’t able to travel to Seattle during the month of February, then flying in November is also cheap. Prices for this month can be found on momondo for an average of C$ 420.

What is the cheapest day to depart on your flight to Seattle?

Our data shows that Thursday is the least expensive day to fly to Seattle. Tickets to fly out on this day can be as low as C$ 541. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around C$ 849. These prices are subject to change though, so be sure to set up a Price Alert for flights to Seattle.

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

Our most recent data shows that the best time of day to fly to Seattle is in the evening. Flights from Region of Ontario to Seattle during this time can be as low as C$ 498. Flights in the morning are often more expensive with an average ticket price of C$ 861.

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

Fly from Toronto Pearson Intl to Seattle/Tacoma Intl for the best Ontario - Seattle/Tacoma Intl flight prices

How far in advance should I book a flight to Seattle?

You are more likely to see cheaper flights to Seattle from Region of Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around C$ 466 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Region of Ontario for as low as C$ 408 on momondo.

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

There are 4 cabin classes available to choose from on Ontario to Seattle/Tacoma Intl 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 Region of Ontario to Seattle flights?

No. A direct flight is the cheapest option for a flight between Region of Ontario to Seattle.

Cheap Region of Ontario to Seattle flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Region of Ontario to Seattle

Best price found	C$ 304
Fastest flight time	5h 22m
Direct flights	Every day
Airports in Seattle	1 airport

The best one-way flight to Seattle from Region of Ontario in the past 72 hours is C$ 304. The best round-trip flight deal from Region of Ontario to Seattle found on momondo in the last 72 hours is C$ 401.

The fastest flight from Region of Ontario to Seattle takes 5h 22m

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

There is 1 airport in Seattle. From Region of Ontario there are direct flights to Seattle/Tacoma Intl (SEA).

Search flight deals

When did momondo last update prices for flights from Ontario to Seattle/Tacoma Intl Airport?
Prices for flights from Ontario to Seattle/Tacoma Intl Airport are updated daily.
How many operators does momondo search for flights from Ontario to Seattle/Tacoma Intl Airport?
The number of operators available for flights from Ontario to Seattle/Tacoma Intl Airport is 7 as of February 2026.
How old do you have to be to fly from Ontario to Seattle/Tacoma Intl Airport?
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 Ontario to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The travel and health documents you'll need for your trip to Seattle/Tacoma Intl Airport 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 Seattle/Tacoma Intl Airport. 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 Region of Ontario to Seattle?
Based on momondo bookings for flights between Region of Ontario and Seattle, the leading plane model is Airbus A220-300, making up 58.82% of the total bookings. Other popular models include Airbus A320-100/200 with 9.44%, Boeing 737 MAX 8 with 5.57%, and Embraer 195 E2 with 4.55%.

Best airlines flying from Region of Ontario to Seattle

Compare and see reviews for airlines that fly from Region of Ontario to Seattle with momondo

Airline	Rating	Free Cancellation	Price
WestJet	PriceFrom C$ 126	Free Cancellation	Rating 7.2 3,270 reviews	Search WestJet flights
Delta	PriceFrom C$ 251	Free Cancellation	Rating 7.9 8,230 reviews	Search Delta flights
United Airlines	PriceFrom C$ 262	Free Cancellation	Rating 7.4 9,336 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom C$ 271	Free Cancellation	Rating 8.0 11,919 reviews	Search Alaska Airlines flights
Air Canada	PriceFrom C$ 318	Free Cancellation	Rating 7.1 10,734 reviews	Search Air Canada flights
Hawaiian Airlines	PriceFrom C$ 407	Free Cancellation	Rating 7.8 2,835 reviews	Search Hawaiian Airlines flights

Lynnwood

Leavenworth

SeaTac

Tacoma

Marysville

Redmond

Kirkland

Tukwila

Olympia

Ocean Shores

Bainbridge Island

Ellensburg

Gig Harbor

Renton

Cle Elum

Centralia

Puyallup

Kent

Edmonds

Federal Way

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Ontario to Seattle for you.

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

Yes. momondo enables you to select and highlight flights to Seattle from Ontario with this policy.

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

Once you have performed a search for Ontario to Seattle flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

If you are not ready to book a flight from Ontario to Seattle now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Seattle and let you know when they change.

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Cheap flights from Ontario to Seattle from C$ 186

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Seattle departing on 14/4. 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 Region of Ontario to Seattle

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

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

What is the cheapest month to fly to Seattle?

What is the cheapest day to depart on your flight to Seattle?

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

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

How far in advance should I book a flight to Seattle?

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

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

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

Which airlines fly to Seattle?

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

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

How long does it take to fly to Seattle?

Cheap Region of Ontario to Seattle flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Region of Ontario to Seattle

Best price found

Fastest flight time

Direct flights

Airports in Seattle

Best airlines flying from Region of Ontario to Seattle

Compare and see reviews for airlines that fly from Region of Ontario to Seattle with momondo

Travelling to a place near Seattle?

Why use momondo?

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

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

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

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

An easier way to manage your Seattle 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 the United States

Airports servicing Washington

Fly your favourite airline to Seattle

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

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List of cabin classes available on flights landing in Seattle. Availability may vary depending on flight origin and airline.

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