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 06m on average. Another popular route from Region of Ontario to Seattle is flying from Ottawa to Seattle, which will take roughly 8h 12m. Keep in mind that layovers or delays could extend your travel time.

Which airlines fly to Seattle?

Air Canada, Alaska Airlines and WestJet are the top three most popular airlines that fly to Seattle from Region of Ontario according to our data. Air Canada is the first choice among our users, with 36% 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.

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

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

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

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 7 per day as of October 2025. The most frequent departure time is 4:00p.m., with 56% of daily flights leaving in the afternoon.

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 October 2025.

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$ 185 Cheap Flights from Ontario to Seattle in 2025/26

1 adult

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Early arrival? Instantly customize your results

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

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.

8:00 p.m. - 2:20 p.m.YYZ-SEA

21h 20m1 stop

3:20 p.m. - 5:58 a.m.SEA-YYZ

11h 38m2 stops

C$ 292WestJet

Find Deal

Sat, 25 Oct - Sat, 1 Nov

6:30 a.m. - 12:59 p.m.YYZ-SEA

9h 29m1 stop

1:50 p.m. - 12:22 a.m.SEA-YYZ

7h 32m1 stop

C$ 295WestJet

Find Deal

Thu, 16 Oct - Wed, 22 Oct

8:00 a.m. - 12:59 p.m.YYZ-SEA

7h 59m1 stop

1:50 p.m. - 12:22 a.m.SEA-YYZ

7h 32m1 stop

C$ 298WestJet

Find Deal

Tue, 21 Oct - Sat, 25 Oct

6:20 a.m. - 4:01 p.m.YOW-SEA

12h 41m1 stop

8:00 p.m. - 6:43 a.m.SEA-YOW

7h 43m1 stop

C$ 308Multiple Airlines

Find Deal

Thu, 5 Feb - Mon, 9 Feb

7:27 p.m. - 1:57 p.m.YOW-SEA

21h 30m2 stops

5:50 a.m. - 3:45 p.m.SEA-YOW

6h 55m1 stop

C$ 321Multiple Airlines

Find Deal

Thu, 5 Feb - Mon, 9 Feb

3:10 p.m. - 11:15 p.m.YOW-SEA

11h 05m1 stop

11:45 p.m. - 1:32 p.m.SEA-YOW

10h 47m1 stop

C$ 326United Airlines

Find Deal

Wed, 28 Jan - Sun, 1 Feb

4:45 p.m. - 7:17 p.m.YYZ-SEA

5h 32mdirect

7:57 a.m. - 3:35 p.m.SEA-YYZ

4h 38mdirect

C$ 360Alaska Airlines

Find Deal

Tue, 25 Nov - Fri, 28 Nov

11:10 a.m. - 6:52 p.m.YOW-SEA

10h 42m1 stop

11:59 p.m. - 4:32 p.m.SEA-YOW

13h 33m2 stops

C$ 419United Airlines

Find Deal

Thu, 30 Oct - Tue, 4 Nov

12:05 p.m. - 10:16 p.m.YOW-SEA

13h 11m1 stop

5:50 a.m. - 3:45 p.m.SEA-YOW

6h 55m1 stop

C$ 436Air Canada

Find Deal

Fri, 7 Nov - Mon, 10 Nov

12:05 p.m. - 10:16 p.m.YOW-SEA

13h 11m1 stop

5:50 a.m. - 3:45 p.m.SEA-YOW

6h 55m1 stop

C$ 437Air Canada

Find Deal

Fri, 7 Nov - Tue, 11 Nov

WestJet flights from Region of Ontario to Seattle

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

WestJet

25 Oct

YYZ8:00 p.m.Toronto Pearson Intl

21h 20m

1 stop

SEA2:20 p.m.Seattle/Tacoma Intl

1 Nov

SEA3:20 p.m.Seattle/Tacoma Intl

11h 38m

2 stops

YYZ5:58 a.m.Toronto Pearson Intl

C$ 292

Find similar

WestJet

16 Oct

YYZ6:30 a.m.Toronto Pearson Intl

9h 29m

1 stop

SEA12:59 p.m.Seattle/Tacoma Intl

22 Oct

SEA1:50 p.m.Seattle/Tacoma Intl

7h 32m

1 stop

YYZ12:22 a.m.Toronto Pearson Intl

C$ 295

Find similar

WestJet

21 Oct

YYZ8:00 a.m.Toronto Pearson Intl

7h 59m

1 stop

SEA12:59 p.m.Seattle/Tacoma Intl

25 Oct

SEA1:50 p.m.Seattle/Tacoma Intl

7h 32m

1 stop

YYZ12:22 a.m.Toronto Pearson Intl

C$ 298

Find similar

United Airlines flights from Region of Ontario to Seattle

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

United Airlines

28 Jan

YOW6:20 a.m.Ottawa

17h 55m

2 stops

SEA9:15 p.m.Seattle/Tacoma Intl

1 Feb

SEA3:30 p.m.Seattle/Tacoma Intl

22h 42m

2 stops

YOW5:12 p.m.Ottawa

C$ 326

Find similar

United Airlines

30 Oct

YOW11:10 a.m.Ottawa

10h 42m

1 stop

SEA6:52 p.m.Seattle/Tacoma Intl

4 Nov

SEA11:59 p.m.Seattle/Tacoma Intl

13h 33m

2 stops

YOW4:32 p.m.Ottawa

C$ 419

Find similar

United Airlines

15 Nov

YOW11:10 a.m.Ottawa

16h 49m

2 stops

SEA12:59 a.m.Seattle/Tacoma Intl

22 Nov

SEA3:48 p.m.Seattle/Tacoma Intl

15h 38m

2 stops

YOW10:26 a.m.Ottawa

C$ 420

Find similar

Fly from

Fly to

Route

Depart

Return

Price

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Sat 25/10

8:00 p.m.-2:20 p.m.

1 stop21h 20m

Seattle/Tacoma Intl

Sat 1/11

3:20 p.m.-5:58 a.m.

2 stops11h 38m

C$ 292

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 16/10

6:30 a.m.-12:59 p.m.

1 stop9h 29m

Seattle/Tacoma Intl

Wed 22/10

1:50 p.m.-12:22 a.m.

1 stop7h 32m

C$ 295

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 21/10

8:00 a.m.-12:59 p.m.

1 stop7h 59m

Seattle/Tacoma Intl

Sat 25/10

1:50 p.m.-12:22 a.m.

1 stop7h 32m

C$ 298

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 5/2

6:20 a.m.-4:01 p.m.

1 stop12h 41m

Seattle/Tacoma Intl

Mon 9/2

8:00 p.m.-6:43 a.m.

1 stop7h 43m

C$ 308

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 5/2

7:27 p.m.-1:57 p.m.

2 stops21h 30m

Seattle/Tacoma Intl

Mon 9/2

5:50 a.m.-3:45 p.m.

1 stop6h 55m

C$ 321

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 28/1

3:10 p.m.-11:15 p.m.

1 stop11h 05m

Seattle/Tacoma Intl

Sun 1/2

11:45 p.m.-1:32 p.m.

1 stop10h 47m

C$ 326

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 25/11

4:45 p.m.-7:17 p.m.

Nonstop5h 32m

Seattle/Tacoma Intl

Fri 28/11

7:57 a.m.-3:35 p.m.

Nonstop4h 38m

C$ 360

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 30/10

11:10 a.m.-6:52 p.m.

1 stop10h 42m

Seattle/Tacoma Intl

Tue 4/11

11:59 p.m.-4:32 p.m.

2 stops13h 33m

C$ 419

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 7/11

12:05 p.m.-10:16 p.m.

1 stop13h 11m

Seattle/Tacoma Intl

Mon 10/11

5:50 a.m.-3:45 p.m.

1 stop6h 55m

C$ 436

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 7/11

12:05 p.m.-10:16 p.m.

1 stop13h 11m

Seattle/Tacoma Intl

Tue 11/11

5:50 a.m.-3:45 p.m.

1 stop6h 55m

C$ 437

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 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 January is also cheap. Prices for this month can be found on momondo for an average of C$ 369.

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$ 566. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around C$ 770. 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$ 441. Flights in the morning are often more expensive with an average ticket price of C$ 853.

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$ 495 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$ 426 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?

You could potentially save up to 29% on your flight if you consider stops on a Region of Ontario to Seattle flight.

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$ 369
Fastest flight time	5h 15m
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$ 369. The best round-trip flight deal from Region of Ontario to Seattle found on momondo in the last 72 hours is C$ 362.

The fastest flight from Region of Ontario to Seattle takes 5h 15m

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

There is 1 airport near Seattle: 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 October 2025.
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 26.91% of the total bookings. Other popular models include Airbus A320-100/200 with 23.09%, Boeing 737 MAX 8 with 22.98%, and Boeing 737-900 Passenger/BBJ3 (winglets) with 7.52%.

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$ 184	Free Cancellation	Rating 7.2 3,111 reviews	Search WestJet flights
United Airlines	PriceFrom C$ 280	Free Cancellation	Rating 7.4 8,929 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom C$ 300	Free Cancellation	Rating 8.0 10,000 reviews	Search Alaska Airlines flights
Air Canada	PriceFrom C$ 342	Free Cancellation	Rating 7.1 10,000 reviews	Search Air Canada flights
Delta	PriceFrom C$ 377	Free Cancellation	Rating 7.9 7,961 reviews	Search Delta flights
Hawaiian Airlines	PriceFrom C$ 414	Free Cancellation	Rating 7.8 2,762 reviews	Search Hawaiian Airlines flights

Leavenworth

Lynnwood

Marysville

Tacoma

SeaTac

Kirkland

Redmond

Olympia

Ocean Shores

Shoreline

Ellensburg

Gig Harbor

Renton

Mukilteo

Cle Elum

Federal Way

Poulsbo

Puyallup

Shelton

Lakewood

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.

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.

Start using Trips

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

Fri 31/10

Fri 7/11

Email me momondo's favourite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States

Cheap flights from Ontario to Seattle from C$ 185

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 22/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names, great deals

Big names, great deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from Ontario to Seattle

Cheap round-trip flights

Cheap one-way flights

Cheap last-minute flights

Cheap direct flights

WestJet flights from Region of Ontario to Seattle

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

United Airlines flights from Region of Ontario to Seattle

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

momondo Fare Finder

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

See travel insights to Seattle from

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

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 January is also cheap. Prices for this month can be found on momondo for an average of C$ 369.

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?

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$ 441. Flights in the morning are often more expensive with an average ticket price of C$ 853.

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?

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?

You could potentially save up to 29% on your flight if you consider stops on a Region of Ontario to Seattle flight.

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

WestJet, United Airlines, and Air Canada are the most popular carriers operating 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?

The number of flights available between Region of Ontario and Seattle is 7 per day as of October 2025. The most frequent departure time is 4:00p.m., with 56% of daily flights leaving in the afternoon.

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

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

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

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

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

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

What is the most popular plane model from Region of Ontario to 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