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.

What 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 34% of people opting to fly with this airline when traveling 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 long does it take to fly to Seattle?

Flight times vary depending on what airport in Region of Ontario you fly out of and what airport in Seattle you fly into. For example, flying from Toronto to Seattle takes 8h 06m on average. On the other hand, flying from Ottawa to Seattle takes 8h 12m on average. Keep in mind that it’s always quicker to opt for a non-stop flight, so be sure to check momondo if there are any available for your route.

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

As of October 2025, 7 flights take off from Region of Ontario and land in Seattle each day. The most common flight departure time for this route is 4:00PM, with 56% of daily flights taking off 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 refresh 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 6 as of October 2025.

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

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 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 required for your trip to Seattle/Tacoma Intl Airport 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 Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$133 Cheap Flights from Ontario to Seattle in 2025/26

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Cheap round-trip flights

Enter your travel dates to find the best prices.

8:00 pm - 2:20 pmYYZ-SEA

21h 20m1 stop

3:20 pm - 5:58 amSEA-YYZ

11h 38m2 stops

$210WestJet

Find Deal

Sat, Oct 25 - Sat, Nov 1

6:30 am - 12:59 pmYYZ-SEA

9h 29m1 stop

1:50 pm - 12:22 amSEA-YYZ

7h 32m1 stop

$212WestJet

Find Deal

Thu, Oct 16 - Wed, Oct 22

8:00 am - 12:59 pmYYZ-SEA

7h 59m1 stop

1:50 pm - 12:22 amSEA-YYZ

7h 32m1 stop

$214WestJet

Find Deal

Tue, Oct 21 - Wed, Oct 22

6:20 am - 4:01 pmYOW-SEA

12h 41m1 stop

8:00 pm - 6:43 amSEA-YOW

7h 43m1 stop

$221Multiple Airlines

Find Deal

Thu, Feb 5 - Mon, Feb 9

7:27 pm - 1:57 pmYOW-SEA

21h 30m2 stops

5:50 am - 3:45 pmSEA-YOW

6h 55m1 stop

$231Multiple Airlines

Find Deal

Thu, Feb 5 - Mon, Feb 9

6:20 am - 9:15 pmYOW-SEA

17h 55m2 stops

3:30 pm - 5:12 pmSEA-YOW

22h 42m2 stops

$234United Airlines

Find Deal

Wed, Jan 28 - Sun, Feb 1

4:45 pm - 7:17 pmYYZ-SEA

5h 32mnonstop

7:57 am - 3:35 pmSEA-YYZ

4h 38mnonstop

$259Alaska Airlines

Find Deal

Tue, Nov 25 - Fri, Nov 28

11:10 am - 6:52 pmYOW-SEA

10h 42m1 stop

11:59 pm - 4:32 pmSEA-YOW

13h 33m2 stops

$301United Airlines

Find Deal

Thu, Oct 30 - Tue, Nov 4

4:10 pm - 10:16 pmYOW-SEA

9h 06m1 stop

5:50 am - 3:45 pmSEA-YOW

6h 55m1 stop

$302Air Canada

Find Deal

Mon, Nov 17 - Thu, Nov 20

12:05 pm - 10:16 pmYOW-SEA

13h 11m1 stop

5:50 am - 3:45 pmSEA-YOW

6h 55m1 stop

$313Air Canada

Find Deal

Fri, Nov 7 - Mon, Nov 10

WestJet flights from Region of Ontario to Seattle

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

WestJet

Oct 25

YYZ8:00 pmToronto Pearson Intl

21h 20m

1 stop

SEA2:20 pmSeattle/Tacoma Intl

Nov 1

SEA3:20 pmSeattle/Tacoma Intl

11h 38m

2 stops

YYZ5:58 amToronto Pearson Intl

$210

Find similar

WestJet

Oct 16

YYZ6:30 amToronto Pearson Intl

9h 29m

1 stop

SEA12:59 pmSeattle/Tacoma Intl

Oct 22

SEA1:50 pmSeattle/Tacoma Intl

7h 32m

1 stop

YYZ12:22 amToronto Pearson Intl

$212

Find similar

WestJet

Oct 21

YYZ8:00 amToronto Pearson Intl

7h 59m

1 stop

SEA12:59 pmSeattle/Tacoma Intl

Oct 22

SEA1:50 pmSeattle/Tacoma Intl

7h 32m

1 stop

YYZ12:22 amToronto Pearson Intl

$214

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

Jan 28

YOW6:20 amOttawa

17h 55m

2 stops

SEA9:15 pmSeattle/Tacoma Intl

Feb 1

SEA3:30 pmSeattle/Tacoma Intl

22h 42m

2 stops

YOW5:12 pmOttawa

$234

Find similar

United Airlines

Oct 30

YOW11:10 amOttawa

10h 42m

1 stop

SEA6:52 pmSeattle/Tacoma Intl

Nov 4

SEA11:59 pmSeattle/Tacoma Intl

13h 33m

2 stops

YOW4:32 pmOttawa

$301

Find similar

United Airlines

Nov 7

YOW12:05 pmOttawa

14h 05m

2 stops

SEA11:10 pmSeattle/Tacoma Intl

Nov 10

SEA7:28 pmSeattle/Tacoma Intl

11h 58m

2 stops

YOW10:26 amOttawa

$361

Find similar

Fly from

Fly to

Route

Depart

Return

Price

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Sat 10/25

8:00 pm-2:20 pm

1 stop21h 20m

Seattle/Tacoma Intl

Sat 11/1

3:20 pm-5:58 am

2 stops11h 38m

$210

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 10/16

6:30 am-12:59 pm

1 stop9h 29m

Seattle/Tacoma Intl

Wed 10/22

1:50 pm-12:22 am

1 stop7h 32m

$212

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 10/21

8:00 am-12:59 pm

1 stop7h 59m

Seattle/Tacoma Intl

Wed 10/22

1:50 pm-12:22 am

1 stop7h 32m

$214

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 2/5

6:20 am-4:01 pm

1 stop12h 41m

Seattle/Tacoma Intl

Mon 2/9

8:00 pm-6:43 am

1 stop7h 43m

$221

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 2/5

7:27 pm-1:57 pm

2 stops21h 30m

Seattle/Tacoma Intl

Mon 2/9

5:50 am-3:45 pm

1 stop6h 55m

$231

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Wed 1/28

6:20 am-9:15 pm

2 stops17h 55m

Seattle/Tacoma Intl

Sun 2/1

3:30 pm-5:12 pm

2 stops22h 42m

$234

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 11/25

4:45 pm-7:17 pm

Nonstop5h 32m

Seattle/Tacoma Intl

Fri 11/28

7:57 am-3:35 pm

Nonstop4h 38m

$259

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 10/30

11:10 am-6:52 pm

1 stop10h 42m

Seattle/Tacoma Intl

Tue 11/4

11:59 pm-4:32 pm

2 stops13h 33m

$301

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Mon 11/17

4:10 pm-10:16 pm

1 stop9h 06m

Seattle/Tacoma Intl

Thu 11/20

5:50 am-3:45 pm

1 stop6h 55m

$302

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Fri 11/7

12:05 pm-10:16 pm

1 stop13h 11m

Seattle/Tacoma Intl

Mon 11/10

5:50 am-3:45 pm

1 stop6h 55m

$313

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?

In general, February is the cheapest month to fly from Region of Ontario to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $263. If you don’t want to visit Seattle in February, then you should wait until January to fly from Region of Ontario, when ticket prices are also cheap, with an average price of $265.

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

On average, the least expensive day to fly to Seattle from Region of Ontario is on a Thursday. momondo users have found tickets for Thursday departures for as low as $431. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from Region of Ontario because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $649.

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

Flying to Seattle from Region of Ontario in the evening is the least expensive time of day to depart. momondo users have found prices as low as $264 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $545. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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 $356 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 $306 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 48% 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	$213
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 $213. The best round-trip flight deal from Region of Ontario to Seattle found on momondo in the last 72 hours is $254.

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 refresh 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 6 as of October 2025.
How old do you have to be to fly from Ontario to Seattle/Tacoma Intl Airport?
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 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 required for your trip to Seattle/Tacoma Intl Airport 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 Seattle/Tacoma Intl Airport. 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 Region of Ontario to Seattle?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Region of Ontario to Seattle is Airbus A220-300 (26.91% of total bookings). The next most popular plane models are Airbus A320-100/200 (23.09%), Boeing 737 MAX 8 (22.98%), and Boeing 737-900 Passenger/BBJ3 (winglets) (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 $193	Free Cancellation	Rating 7.2 3,111 reviews	Search WestJet flights
Alaska Airlines	PriceFrom $225	Free Cancellation	Rating 8.0 10,000 reviews	Search Alaska Airlines flights
Air Canada	PriceFrom $238	Free Cancellation	Rating 7.1 10,000 reviews	Search Air Canada flights
United Airlines	PriceFrom $240	Free Cancellation	Rating 7.4 8,929 reviews	Search United Airlines flights
American Airlines	PriceFrom $277	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Delta	PriceFrom $289	Free Cancellation	Rating 7.9 7,961 reviews	Search Delta flights

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Puyallup

Marysville

Federal Way

Tukwila

Kirkland

Fife

Centralia

Shoreline

Lakewood

Cle Elum

Redmond

Westport

Why use momondo?

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

Finding the right flight to Seattle from Ontario is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Seattle quick and easy, saving you time and money.

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

momondo does allow users to show only those flights to Seattle from Ontario which offer a flexible booking policy as well as other useful filters and features.

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 simply researching potential flights to Seattle, momondo offers a useful price alert feature which will track prices for flights to Seattle from Ontario and alert you 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.

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Cheap flights from Ontario to Seattle from $133

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 10/22. 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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Find the cheapest flights from Ontario to Seattle

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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

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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

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?

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 48% 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

What airlines fly to Seattle?

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

As of October 2025, 7 flights take off from Region of Ontario and land in Seattle each day. The most common flight departure time for this route is 4:00PM, with 56% of daily flights taking off 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

Traveling 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