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 35% 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, Air Canada, 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 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 02m on average. On the other hand, flying from Ottawa to Seattle takes 8h 17m 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 week?

The number of flights available between Region of Ontario and Seattle is 26 per week as of January 2026. The most frequent departure day is Wed, with 23% of weekly flights leaving on this day.

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

As of January 2026, 3 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 58% 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 January 2026.

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.

$125 Cheap Flights from Ontario to Seattle in 2026

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One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

7:45 am - 2:19 pm

YYZ

SEA

9h 34m1 stop

3:10 pm - 12:28 pm

SEA

YYZ

18h 18m1 stop

$185WestJet

Tue, Feb 3 - Tue, Feb 10

4:45 pm - 7:17 pm

YYZ

SEA

5h 32mnonstop

7:55 am - 3:35 pm

SEA

YYZ

4h 40mnonstop

$186Alaska Airlines

Tue, Feb 3 - Sun, Feb 8

4:45 pm - 7:17 pm

YYZ

SEA

5h 32mnonstop

3:10 pm - 5:58 am

SEA

YYZ

11h 48m2 stops

$187Multiple Airlines

Thu, Jan 22 - Mon, Jan 26

4:55 pm - 7:23 pm

YYZ

SEA

5h 28mnonstop

7:05 am - 6:52 pm

SEA

YYZ

8h 47m1 stop

$189Multiple Airlines

Thu, Apr 23 - Mon, Apr 27

7:30 am - 2:19 pm

YXU

SEA

9h 49m1 stop

7:05 am - 7:07 pm

SEA

YXU

9h 02m1 stop

$190WestJet

Fri, Apr 10 - Mon, Apr 27

7:45 am - 2:19 pm

YYZ

SEA

9h 34m1 stop

7:55 am - 3:35 pm

SEA

YYZ

4h 40mnonstop

$190Multiple Airlines

Tue, Feb 3 - Wed, Feb 11

9:00 am - 2:31 pm

YYZ

SEA

8h 31m1 stop

8:10 am - 3:53 pm

SEA

YYZ

4h 43mnonstop

$191Air Canada

Tue, Feb 3 - Tue, Feb 10

7:45 am - 2:19 pm

YYZ

SEA

9h 34m1 stop

3:10 pm - 12:23 pm

SEA

YYZ

18h 13m2 stops

$192WestJet

Tue, Feb 3 - Tue, Feb 10

4:45 pm - 7:17 pm

YYZ

SEA

5h 32mnonstop

8:10 am - 3:53 pm

SEA

YYZ

4h 43mnonstop

$193Multiple Airlines

Thu, Jan 22 - Wed, Jan 28

5:40 pm - 10:16 pm

YXU

SEA

7h 36m1 stop

8:00 pm - 8:46 am

SEA

YXU

9h 46m2 stops

$223Air Canada

Fri, Feb 27 - Thu, Mar 5

United Airlines flights from Region of Ontario to Seattle

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

United Airlines

Feb 13

YYZ8:45 amToronto Pearson Intl

13h 18m

1 stop

SEA7:03 pmSeattle/Tacoma Intl

Feb 25

SEA11:59 pmSeattle/Tacoma Intl

13h 03m

1 stop

YYZ4:02 pmToronto Pearson Intl

$211

United Airlines

Jan 26

YYZ2:45 pmToronto Pearson Intl

10h 58m

2 stops

SEA10:43 pmSeattle/Tacoma Intl

Jan 30

SEA7:00 amSeattle/Tacoma Intl

9h 45m

1 stop

YYZ7:45 pmToronto Pearson Intl

$220

United Airlines

Jan 20

YYZ3:45 pmToronto Pearson Intl

10h 14m

1 stop

SEA10:59 pmSeattle/Tacoma Intl

Jan 24

SEA5:00 amSeattle/Tacoma Intl

13h 24m

2 stops

YYZ9:24 pmToronto Pearson Intl

$221

WestJet flights from Region of Ontario to Seattle

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

WestJet

Feb 3

YYZ7:45 amToronto Pearson Intl

9h 34m

1 stop

SEA2:19 pmSeattle/Tacoma Intl

Feb 10

SEA3:10 pmSeattle/Tacoma Intl

18h 18m

1 stop

YYZ12:28 pmToronto Pearson Intl

$185

WestJet

Apr 10

YXU7:30 amLondon

9h 49m

1 stop

SEA2:19 pmSeattle/Tacoma Intl

Apr 27

SEA7:05 amSeattle/Tacoma Intl

9h 02m

1 stop

YXU7:07 pmLondon

$190

WestJet

Feb 3

YYZ7:45 amToronto Pearson Intl

9h 34m

1 stop

SEA2:19 pmSeattle/Tacoma Intl

Feb 10

SEA3:10 pmSeattle/Tacoma Intl

18h 13m

2 stops

YYZ12:23 pmToronto Pearson Intl

$192

Fly from

Fly to

Route

Depart

Return

Price

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 2/3

7:45 am-2:19 pm

1 stop9h 34m

Seattle/Tacoma Intl

Tue 2/10

3:10 pm-12:28 pm

1 stop18h 18m

$185

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 2/3

4:45 pm-7:17 pm

Nonstop5h 32m

Seattle/Tacoma Intl

Sun 2/8

7:55 am-3:35 pm

Nonstop4h 40m

$186

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 1/22

4:45 pm-7:17 pm

Nonstop5h 32m

Seattle/Tacoma Intl

Mon 1/26

3:10 pm-5:58 am

2 stops11h 48m

$187

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 4/23

4:55 pm-7:23 pm

Nonstop5h 28m

Seattle/Tacoma Intl

Mon 4/27

7:05 am-6:52 pm

1 stop8h 47m

$189

LondonSeattle

YXU - SEA

YXUSEA

London

Fri 4/10

7:30 am-2:19 pm

1 stop9h 49m

Seattle/Tacoma Intl

Mon 4/27

7:05 am-7:07 pm

1 stop9h 02m

$190

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 2/3

7:45 am-2:19 pm

1 stop9h 34m

Seattle/Tacoma Intl

Wed 2/11

7:55 am-3:35 pm

Nonstop4h 40m

$190

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 2/3

9:00 am-2:31 pm

1 stop8h 31m

Seattle/Tacoma Intl

Tue 2/10

8:10 am-3:53 pm

Nonstop4h 43m

$191

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 2/3

7:45 am-2:19 pm

1 stop9h 34m

Seattle/Tacoma Intl

Tue 2/10

3:10 pm-12:23 pm

2 stops18h 13m

$192

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 1/22

4:45 pm-7:17 pm

Nonstop5h 32m

Seattle/Tacoma Intl

Wed 1/28

8:10 am-3:53 pm

Nonstop4h 43m

$193

LondonSeattle

YXU - SEA

YXUSEA

London

Fri 2/27

5:40 pm-10:16 pm

1 stop7h 36m

Seattle/Tacoma Intl

Thu 3/5

8:00 pm-8:46 am

2 stops9h 46m

$223

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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 $261. If you don’t want to visit Seattle in February, then you should wait until November to fly from Region of Ontario, when ticket prices are also cheap, with an average price of $307.

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 Wednesday. momondo users have found tickets for Wednesday departures for as low as $421. 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 $760.

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 $271 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $552. 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 $352 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 $295 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 14% 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	$205
Fastest flight time	5h 20m
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 $205. The best round-trip flight deal from Region of Ontario to Seattle found on momondo in the last 72 hours is $257.

The fastest flight from Region of Ontario to Seattle takes 5h 20m

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 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 January 2026.
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 (61.34% of total bookings). The next most popular plane models are Boeing 737 MAX 8 (7.86%), Embraer 195 E2 (7.47%), and Boeing 737-900 Passenger/BBJ3 (winglets) (3.09%).

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 3,235 reviews	Search WestJet flights
Alaska Airlines	PriceFrom $204	Free Cancellation	Rating 8.0 11,668 reviews	Search Alaska Airlines flights
Air Canada	PriceFrom $237	Free Cancellation	Rating 7.1 10,603 reviews	Search Air Canada flights
United Airlines	PriceFrom $240	Free Cancellation	Rating 7.4 9,141 reviews	Search United Airlines flights
American Airlines	PriceFrom $277	Free Cancellation	Rating 7.2 11,095 reviews	Search American Airlines flights
Delta	PriceFrom $289	Free Cancellation	Rating 7.9 8,030 reviews	Search Delta flights

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SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Marysville

Puyallup

Redmond

Tukwila

Federal Way

Cle Elum

Lakewood

Fife

Westport

Kirkland

Centralia

Shoreline

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

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Cheap flights from Ontario to Seattle from $125

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 4/19. 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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United Airlines flights from Region of Ontario to Seattle

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

WestJet flights from Region of Ontario to Seattle

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

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

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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?

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 14% 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, Air Canada, and Alaska Airlines 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 January 2026, 3 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 58% 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 26 per week as of January 2026. The most frequent departure day is Wed, with 23% 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