Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from Ontario to Seattle from C$ 173

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 19/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

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

Trusted and free

Trusted and free

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

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Ontario to Seattle

Cheap round-trip flights

Enter your travel dates to find the best prices.
WestJet Logo
7:45 a.m. - 2:19 p.m.
YYZ
-
SEA
9h 34m1 stop
WestJet Logo
3:10 p.m. - 12:28 p.m.
SEA
-
YYZ
18h 18m1 stop
C$ 256WestJet
Tue, 3 Feb - Tue, 10 Feb
Alaska Airlines Logo
4:45 p.m. - 7:17 p.m.
YYZ
-
SEA
5h 32mdirect
Alaska Airlines Logo
7:55 a.m. - 3:35 p.m.
SEA
-
YYZ
4h 40mdirect
C$ 257Alaska Airlines
Tue, 3 Feb - Sun, 8 Feb
Multiple Airlines Logo
4:45 p.m. - 7:17 p.m.
YYZ
-
SEA
5h 32mdirect
Multiple Airlines Logo
3:10 p.m. - 5:58 a.m.
SEA
-
YYZ
11h 48m2 stops
C$ 258Multiple Airlines
Thu, 22 Jan - Mon, 26 Jan
Multiple Airlines Logo
4:55 p.m. - 7:23 p.m.
YYZ
-
SEA
5h 28mdirect
Multiple Airlines Logo
7:05 a.m. - 6:52 p.m.
SEA
-
YYZ
8h 47m1 stop
C$ 261Multiple Airlines
Thu, 23 Apr - Mon, 27 Apr
WestJet Logo
7:30 a.m. - 2:19 p.m.
YXU
-
SEA
9h 49m1 stop
WestJet Logo
7:05 a.m. - 7:07 p.m.
SEA
-
YXU
9h 02m1 stop
C$ 263WestJet
Fri, 10 Apr - Mon, 27 Apr
Multiple Airlines Logo
7:45 a.m. - 2:19 p.m.
YYZ
-
SEA
9h 34m1 stop
Multiple Airlines Logo
7:55 a.m. - 3:35 p.m.
SEA
-
YYZ
4h 40mdirect
C$ 263Multiple Airlines
Tue, 3 Feb - Wed, 11 Feb
Air Canada Logo
9:00 a.m. - 2:31 p.m.
YYZ
-
SEA
8h 31m1 stop
Air Canada Logo
8:10 a.m. - 3:53 p.m.
SEA
-
YYZ
4h 43mdirect
C$ 264Air Canada
Tue, 3 Feb - Tue, 10 Feb
WestJet Logo
7:45 a.m. - 2:19 p.m.
YYZ
-
SEA
9h 34m1 stop
WestJet Logo
3:10 p.m. - 12:23 p.m.
SEA
-
YYZ
18h 13m2 stops
C$ 265WestJet
Tue, 3 Feb - Tue, 10 Feb
Multiple Airlines Logo
4:45 p.m. - 7:17 p.m.
YYZ
-
SEA
5h 32mdirect
Multiple Airlines Logo
8:10 a.m. - 3:53 p.m.
SEA
-
YYZ
4h 43mdirect
C$ 267Multiple Airlines
Thu, 22 Jan - Wed, 28 Jan
Air Canada Logo
5:40 p.m. - 10:16 p.m.
YXU
-
SEA
7h 36m1 stop
Air Canada Logo
8:00 p.m. - 8:46 a.m.
SEA
-
YXU
9h 46m2 stops
C$ 308Air Canada
Fri, 27 Feb - Thu, 5 Mar

United Airlines flights from Region of Ontario to Seattle

Our best United Airlines deals on Region of Ontario to Seattle flight tickets
United Airlines
13 Feb
YYZ8:45 a.m.Toronto Pearson Intl
13h 18m
1 stop
SEA7:03 p.m.Seattle/Tacoma Intl
25 Feb
SEA11:59 p.m.Seattle/Tacoma Intl
13h 03m
1 stop
YYZ4:02 p.m.Toronto Pearson Intl
C$ 292
United Airlines
26 Jan
YYZ2:45 p.m.Toronto Pearson Intl
10h 58m
2 stops
SEA10:43 p.m.Seattle/Tacoma Intl
30 Jan
SEA5:00 a.m.Seattle/Tacoma Intl
11h 17m
2 stops
YYZ7:17 p.m.Toronto Pearson Intl
C$ 304
United Airlines
18 Feb
YYZ3:45 p.m.Toronto Pearson Intl
10h 15m
1 stop
SEA11:00 p.m.Seattle/Tacoma Intl
24 Feb
SEA9:00 a.m.Seattle/Tacoma Intl
11h 46m
2 stops
YYZ11:46 p.m.Toronto Pearson Intl
C$ 305

WestJet flights from Region of Ontario to Seattle

Our best WestJet deals on Region of Ontario to Seattle flight tickets
WestJet
3 Feb
YYZ7:45 a.m.Toronto Pearson Intl
9h 34m
1 stop
SEA2:19 p.m.Seattle/Tacoma Intl
10 Feb
SEA3:10 p.m.Seattle/Tacoma Intl
18h 18m
1 stop
YYZ12:28 p.m.Toronto Pearson Intl
C$ 256
WestJet
10 Apr
YXU7:30 a.m.London
9h 49m
1 stop
SEA2:19 p.m.Seattle/Tacoma Intl
27 Apr
SEA7:05 a.m.Seattle/Tacoma Intl
9h 02m
1 stop
YXU7:07 p.m.London
C$ 263
WestJet
3 Feb
YYZ7:45 a.m.Toronto Pearson Intl
9h 34m
1 stop
SEA2:19 p.m.Seattle/Tacoma Intl
10 Feb
SEA3:10 p.m.Seattle/Tacoma Intl
18h 13m
2 stops
YYZ12:23 p.m.Toronto Pearson Intl
C$ 265

momondo Fare Finder

 
Customize your flight search to find flights from Region of Ontario to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 96,600 searches. Data last updated 8 January 2026.
Use the filters below to find and compare flights from Ontario to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 3/2

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

1 stop9h 34m

Seattle/Tacoma Intl

Tue 10/2

3:10 p.m.-12:28 p.m.

1 stop18h 18m

C$ 256

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 3/2

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

Nonstop5h 32m

Seattle/Tacoma Intl

Sun 8/2

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

Nonstop4h 40m

C$ 257

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 22/1

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

Nonstop5h 32m

Seattle/Tacoma Intl

Mon 26/1

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

2 stops11h 48m

C$ 258

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 23/4

4:55 p.m.-7:23 p.m.

Nonstop5h 28m

Seattle/Tacoma Intl

Mon 27/4

7:05 a.m.-6:52 p.m.

1 stop8h 47m

C$ 261

LondonSeattle

YXU - SEA

YXUSEA

London

Fri 10/4

7:30 a.m.-2:19 p.m.

1 stop9h 49m

Seattle/Tacoma Intl

Mon 27/4

7:05 a.m.-7:07 p.m.

1 stop9h 02m

C$ 263

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 3/2

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

1 stop9h 34m

Seattle/Tacoma Intl

Wed 11/2

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

Nonstop4h 40m

C$ 263

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 3/2

9:00 a.m.-2:31 p.m.

1 stop8h 31m

Seattle/Tacoma Intl

Tue 10/2

8:10 a.m.-3:53 p.m.

Nonstop4h 43m

C$ 264

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Tue 3/2

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

1 stop9h 34m

Seattle/Tacoma Intl

Tue 10/2

3:10 p.m.-12:23 p.m.

2 stops18h 13m

C$ 265

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

Thu 22/1

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

Nonstop5h 32m

Seattle/Tacoma Intl

Wed 28/1

8:10 a.m.-3:53 p.m.

Nonstop4h 43m

C$ 267

LondonSeattle

YXU - SEA

YXUSEA

London

Fri 27/2

5:40 p.m.-10:16 p.m.

1 stop7h 36m

Seattle/Tacoma Intl

Thu 5/3

8:00 p.m.-8:46 a.m.

2 stops9h 46m

C$ 308

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 November is also cheap. Prices for this month can be found on momondo for an average of C$ 424.

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$ 795. 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$ 440. Flights in the morning are often more expensive with an average ticket price of C$ 855.

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$ 487 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?

You could potentially save up to 2% 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$ 250

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 C$ 250. The best round-trip flight deal from Region of Ontario to Seattle found on momondo in the last 72 hours is C$ 312.
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 are updated daily.

  • 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?

    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?

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
WestJetPriceFrom C$ 183Free CancellationRating
7.2
3,235 reviews
Search WestJet flights
United AirlinesPriceFrom C$ 278Free CancellationRating
7.4
9,142 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom C$ 278Free CancellationRating
8.0
11,672 reviews
Search Alaska Airlines flights
Air CanadaPriceFrom C$ 337Free CancellationRating
7.1
10,603 reviews
Search Air Canada flights
DeltaPriceFrom C$ 343Free CancellationRating
7.9
8,032 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom C$ 411Free CancellationRating
7.8
2,824 reviews
Search Hawaiian Airlines flights

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Lynnwood
Leavenworth
Tacoma
Marysville
SeaTac
Redmond
Kirkland
Tukwila
Olympia
Ocean Shores
Bainbridge Island
Ellensburg
Gig Harbor
Renton
Mukilteo
Cle Elum
Centralia
Puyallup
Federal Way
Kent

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
Sat 7/2
Sat 14/2
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States