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 28 per week as of April 2026. The most frequent departure day is Sat, 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 4 per day as of April 2026. The most frequent departure time is 7:00p.m., with 81% of daily flights leaving in the evening.

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 Ottawa and flying into Seattle (one of the most popular routes), then the duration is 8h 13m on average. Another popular route from Region of Ontario to Seattle is flying from Toronto to Seattle, which will take roughly 8h 55m. Keep in mind that layovers or delays could extend your travel time.

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?

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 35% 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.

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 April 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$ 215 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.

1:30 p.m. - 6:45 p.m.

YYZ

SEA

8h 15m

1 stop

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

SEA

YYZ

7h 10m

1 stop

C$ 304WestJet

Thu, 7 May - Wed, 13 May

12:00 p.m. - 6:45 p.m.

YYZ

SEA

9h 45m

1 stop

10:30 a.m. - 9:15 p.m.

SEA

YYZ

7h 45m

1 stop

C$ 306WestJet

Thu, 4 Jun - Tue, 23 Jun

1:30 p.m. - 6:45 p.m.

YYZ

SEA

8h 15m

1 stop

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

SEA

YYZ

8h 20m

1 stop

C$ 307WestJet

Thu, 7 May - Sat, 16 May

12:30 a.m. - 10:05 a.m.

YYZ

SEA

12h 35m

2 stops

7:20 p.m. - 8:10 a.m.

SEA

YYZ

9h 50m

2 stops

C$ 321Air Canada

Thu, 21 May - Fri, 29 May

1:30 p.m. - 6:45 p.m.

YYZ

SEA

8h 15m

1 stop

10:30 a.m. - 9:15 p.m.

SEA

YYZ

7h 45m

1 stop

C$ 328WestJet

Tue, 28 Apr - Sat, 2 May

6:55 p.m. - 2:20 p.m.

YTZ

SEA

22h 25m

2 stops

7:20 p.m. - 10:12 a.m.

SEA

YTZ

11h 52m

2 stops

C$ 403Air Canada

Fri, 22 May - Fri, 29 May

6:55 p.m. - 10:05 a.m.

YTZ

SEA

18h 10m

2 stops

7:20 p.m. - 10:12 a.m.

SEA

YTZ

11h 52m

2 stops

C$ 433Air Canada

Fri, 22 May - Fri, 29 May

7:20 p.m. - 9:40 a.m.

YTZ

SEA

17h 20m

1 stop

1:36 p.m. - 10:06 a.m.

SEA

YTZ

17h 30m

1 stop

C$ 450United Airlines

Tue, 2 Jun - Wed, 3 Jun

7:20 p.m. - 9:40 a.m.

YTZ

SEA

17h 20m

1 stop

1:36 p.m. - 10:06 a.m.

SEA

YTZ

17h 30m

1 stop

C$ 451United Airlines

Tue, 2 Jun - Wed, 3 Jun

12:15 p.m. - 2:36 p.m.

YTZ

SEA

29h 21m

2 stops

10:40 p.m. - 10:06 a.m.

SEA

YTZ

8h 26m

1 stop

C$ 458United Airlines

Tue, 2 Jun - Wed, 3 Jun

Air Canada flights from Region of Ontario to Seattle

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

Air Canada

21 May

YYZ12:30 a.m.Toronto Pearson Intl

12h 35m

2 stops

SEA10:05 a.m.Seattle/Tacoma Intl

29 May

SEA7:20 p.m.Seattle/Tacoma Intl

9h 50m

2 stops

YYZ8:10 a.m.Toronto Pearson Intl

C$ 321

Air Canada

1 May

YYZ12:30 a.m.Toronto Pearson Intl

12h 35m

2 stops

SEA10:05 a.m.Seattle/Tacoma Intl

9 May

SEA8:00 a.m.Seattle/Tacoma Intl

4h 54m

YYZ3:54 p.m.Toronto Pearson Intl

C$ 371

Air Canada

1 May

YYZ12:30 a.m.Toronto Pearson Intl

12h 35m

2 stops

SEA10:05 a.m.Seattle/Tacoma Intl

13 May

SEA5:50 a.m.Seattle/Tacoma Intl

10h 37m

2 stops

YYZ7:27 p.m.Toronto Pearson Intl

C$ 386

WestJet flights from Region of Ontario to Seattle

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

WestJet

7 May

YYZ1:30 p.m.Toronto Pearson Intl

8h 15m

1 stop

SEA6:45 p.m.Seattle/Tacoma Intl

13 May

SEA7:35 p.m.Seattle/Tacoma Intl

7h 10m

1 stop

YYZ5:45 a.m.Toronto Pearson Intl

C$ 304

WestJet

4 Jun

YYZ12:00 p.m.Toronto Pearson Intl

9h 45m

1 stop

SEA6:45 p.m.Seattle/Tacoma Intl

23 Jun

SEA10:30 a.m.Seattle/Tacoma Intl

7h 45m

1 stop

YYZ9:15 p.m.Toronto Pearson Intl

C$ 306

WestJet

7 May

YYZ1:30 p.m.Toronto Pearson Intl

8h 15m

1 stop

SEA6:45 p.m.Seattle/Tacoma Intl

16 May

SEA7:35 p.m.Seattle/Tacoma Intl

8h 20m

1 stop

YYZ6:55 a.m.Toronto Pearson Intl

C$ 307

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 7/5

1:30 p.m.-6:45 p.m.

1 stop8h 15m

Seattle/Tacoma Intl

Wed 13/5

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

1 stop7h 10m

C$ 304

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 4/6

12:00 p.m.-6:45 p.m.

1 stop9h 45m

Seattle/Tacoma Intl

Tue 23/6

10:30 a.m.-9:15 p.m.

1 stop7h 45m

C$ 306

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 7/5

1:30 p.m.-6:45 p.m.

1 stop8h 15m

Seattle/Tacoma Intl

Sat 16/5

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

1 stop8h 20m

C$ 307

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 21/5

12:30 a.m.-10:05 a.m.

2 stops12h 35m

Seattle/Tacoma Intl

Fri 29/5

7:20 p.m.-8:10 a.m.

2 stops9h 50m

C$ 321

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 28/4

1:30 p.m.-6:45 p.m.

1 stop8h 15m

Seattle/Tacoma Intl

Sat 2/5

10:30 a.m.-9:15 p.m.

1 stop7h 45m

C$ 328

TorontoSeattle

YTZ - SEA

YTZSEA

Toronto Island

Fri 22/5

6:55 p.m.-2:20 p.m.

2 stops22h 25m

Seattle/Tacoma Intl

Fri 29/5

7:20 p.m.-10:12 a.m.

2 stops11h 52m

C$ 403

TorontoSeattle

YTZ - SEA

YTZSEA

Toronto Island

Fri 22/5

6:55 p.m.-10:05 a.m.

2 stops18h 10m

Seattle/Tacoma Intl

Fri 29/5

7:20 p.m.-10:12 a.m.

2 stops11h 52m

C$ 433

TorontoSeattle

YTZ - SEA

YTZSEA

Toronto Island

Tue 2/6

7:20 p.m.-9:40 a.m.

1 stop17h 20m

Seattle/Tacoma Intl

Wed 3/6

1:36 p.m.-10:06 a.m.

1 stop17h 30m

C$ 450

TorontoSeattle

YTZ - SEA

YTZSEA

Toronto Island

Tue 2/6

7:20 p.m.-9:40 a.m.

1 stop17h 20m

Seattle/Tacoma Intl

Wed 3/6

1:36 p.m.-10:06 a.m.

1 stop17h 30m

C$ 451

TorontoSeattle

YTZ - SEA

YTZSEA

Toronto Island

Tue 2/6

12:15 p.m.-2:36 p.m.

2 stops29h 21m

Seattle/Tacoma Intl

Wed 3/6

10:40 p.m.-10:06 a.m.

1 stop8h 26m

C$ 458

Flights are sorted by cheapest round-trip flights first.

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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$ 415.

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

Our data shows that Friday is the least expensive day to fly to Seattle. Tickets to fly out on this day can be as low as C$ 556. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around C$ 853. 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$ 514. Flights in the morning are often more expensive with an average ticket price of C$ 928.

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$ 467 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$ 404 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 40% 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$ 270
Fastest flight time	5h 19m
Direct flights	Tue, Wed, Thu, Fri, Sat and Sun
Airports in Seattle	1 airport

The best one-way flight to Seattle from Region of Ontario in the past 72 hours is C$ 270. The best round-trip flight deal from Region of Ontario to Seattle found on momondo in the last 72 hours is C$ 503.

The fastest flight from Region of Ontario to Seattle takes 5h 19m

Direct flights go from Region of Ontario to Seattle on Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday. There are no airlines offering direct flights.

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

Search flight deals

Frequently asked questions about flying from Ontario to Seattle

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 April 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 61.05% of the total bookings. Other popular models include Airbus A320-100/200 with 9.26%, Boeing 787-9 Dreamliner with 4.74%, and Boeing 777-300ER with 4.11%.

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$ 128	Free Cancellation	Rating 7.2 3,320 reviews	Search WestJet flights
United Airlines	PriceFrom C$ 252	Free Cancellation	Rating 7.4 9,575 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom C$ 273	Free Cancellation	Rating 7.9 12,223 reviews	Search Alaska Airlines flights
Delta	PriceFrom C$ 279	Free Cancellation	Rating 7.9 8,407 reviews	Search Delta flights
Air Canada	PriceFrom C$ 307	Free Cancellation	Rating 7.1 10,917 reviews	Search Air Canada flights
Hawaiian Airlines	PriceFrom C$ 412	Free Cancellation	Rating 7.8 2,839 reviews	Search Hawaiian Airlines flights

Lynnwood

Leavenworth

SeaTac

Marysville

Redmond

Kirkland

Tacoma

Puyallup

Tukwila

Olympia

Ocean Shores

Ellensburg

Bainbridge Island

Gig Harbor

Renton

Centralia

Kent

Edmonds

Federal Way

Shelton

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$ 215

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 19/5. 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 Region of Ontario to Seattle

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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

Frequently asked questions about flying from 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?

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

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Fly your favourite airline to Seattle

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

Cabin classes currently available on flights to Seattle

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

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