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Cheap flights from Ontario to Seattle from C$ 216

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 14/12. 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

Cheap round-trip flights

Enter your travel dates to find the best prices.
WestJet Logo
3:45 p.m. - 8:28 p.m.YOW-SEA
7h 43m1 stop
WestJet Logo
7:05 a.m. - 6:25 p.m.SEA-YOW
8h 20m1 stop
C$ 275WestJet
Find Deal
sex, 15 mai - sáb, 23 mai
WestJet Logo
12:00 p.m. - 8:28 p.m.YYZ-SEA
11h 28m2 stops
WestJet Logo
7:05 a.m. - 9:00 p.m.SEA-YYZ
10h 55m2 stops
C$ 297WestJet
Find Deal
qui, 7 mai - seg, 11 mai
WestJet Logo
8:00 a.m. - 2:38 p.m.YYZ-SEA
9h 38m2 stops
WestJet Logo
3:10 p.m. - 5:23 p.m.SEA-YYZ
23h 13m2 stops
C$ 303WestJet
Find Deal
sáb, 10 jan - ter, 10 fev
WestJet Logo
7:45 a.m. - 2:20 p.m.YYZ-SEA
9h 35m1 stop
WestJet Logo
3:10 p.m. - 5:23 p.m.SEA-YYZ
23h 13m2 stops
C$ 304WestJet
Find Deal
dom, 25 jan - qui, 29 jan
Air Canada Logo
7:50 p.m. - 10:16 p.m.YYZ-SEA
5h 26mdirect
Air Canada Logo
8:10 a.m. - 3:53 p.m.SEA-YYZ
4h 43mdirect
C$ 310Air Canada
Find Deal
sex, 9 jan - sáb, 17 jan
Multiple Airlines Logo
8:00 a.m. - 2:38 p.m.YYZ-SEA
9h 38m2 stops
Multiple Airlines Logo
7:55 a.m. - 3:35 p.m.SEA-YYZ
4h 40mdirect
C$ 317Multiple Airlines
Find Deal
sáb, 10 jan - sáb, 17 jan
Air Canada Logo
5:10 a.m. - 2:31 p.m.YXU-SEA
12h 21m2 stops
Air Canada Logo
8:00 p.m. - 8:46 a.m.SEA-YXU
9h 46m2 stops
C$ 346Air Canada
Find Deal
ter, 20 jan - qua, 21 jan
United Airlines Logo
2:13 p.m. - 8:54 p.m.YUL-SEA
9h 41m1 stop
United Airlines Logo
8:10 a.m. - 7:48 p.m.SEA-YUL
8h 38m1 stop
C$ 412United Airlines
Find Deal
sáb, 6 dez - ter, 9 dez
United Airlines Logo
6:00 a.m. - 11:15 p.m.YUL-SEA
20h 15m2 stops
United Airlines Logo
3:25 p.m. - 2:00 p.m.SEA-YUL
19h 35m2 stops
C$ 417United Airlines
Find Deal
sex, 12 dez - seg, 15 dez
Multiple Airlines Logo
7:00 p.m. - 10:23 a.m.YKF-SEA
18h 23m2 stops
Multiple Airlines Logo
3:40 p.m. - 5:28 a.m.SEA-YKF
34h 48m3 stops
C$ 548Multiple Airlines
Find Deal
sáb, 10 jan - sáb, 17 jan

Air Canada flights from Region of Ontario to Seattle

Our best Air Canada deals on Region of Ontario to Seattle flight tickets
Air Canada
9 Jan
YYZ7:50 p.m.Toronto Pearson Intl
5h 26m
SEA10:16 p.m.Seattle/Tacoma Intl
17 Jan
SEA8:10 a.m.Seattle/Tacoma Intl
4h 43m
YYZ3:53 p.m.Toronto Pearson Intl
C$ 310
Find similar
Air Canada
10 Jan
YYZ7:50 p.m.Toronto Pearson Intl
5h 26m
SEA10:16 p.m.Seattle/Tacoma Intl
17 Jan
SEA8:10 a.m.Seattle/Tacoma Intl
4h 43m
YYZ3:53 p.m.Toronto Pearson Intl
C$ 327
Find similar
Air Canada
9 Jan
YYZ12:00 p.m.Toronto Pearson Intl
13h 06m
2 stops
SEA10:06 p.m.Seattle/Tacoma Intl
17 Jan
SEA8:00 p.m.Seattle/Tacoma Intl
7h 19m
1 stop
YYZ6:19 a.m.Toronto Pearson Intl
C$ 331
Find similar

WestJet flights from Region of Ontario to Seattle

Our best WestJet deals on Region of Ontario to Seattle flight tickets
WestJet
15 May
YOW3:45 p.m.Ottawa
7h 43m
1 stop
SEA8:28 p.m.Seattle/Tacoma Intl
23 May
SEA7:05 a.m.Seattle/Tacoma Intl
8h 20m
1 stop
YOW6:25 p.m.Ottawa
C$ 275
Find similar
WestJet
15 May
YOW3:45 p.m.Ottawa
7h 43m
1 stop
SEA8:28 p.m.Seattle/Tacoma Intl
23 May
SEA7:05 a.m.Seattle/Tacoma Intl
8h 20m
1 stop
YOW6:25 p.m.Ottawa
C$ 276
Find similar
WestJet
7 May
YYZ12:00 p.m.Toronto Pearson Intl
11h 28m
2 stops
SEA8:28 p.m.Seattle/Tacoma Intl
11 May
SEA7:05 a.m.Seattle/Tacoma Intl
10h 55m
2 stops
YYZ9:00 p.m.Toronto Pearson Intl
C$ 297
Find similar

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 17 novembro 2025.
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

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

sex 15/5

3:45 p.m.-8:28 p.m.

1 stop7h 43m

Seattle/Tacoma Intl

sáb 23/5

7:05 a.m.-6:25 p.m.

1 stop8h 20m

C$ 275

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

qui 7/5

12:00 p.m.-8:28 p.m.

2 stops11h 28m

Seattle/Tacoma Intl

seg 11/5

7:05 a.m.-9:00 p.m.

2 stops10h 55m

C$ 297

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

sáb 10/1

8:00 a.m.-2:38 p.m.

2 stops9h 38m

Seattle/Tacoma Intl

ter 10/2

3:10 p.m.-5:23 p.m.

2 stops23h 13m

C$ 303

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

dom 25/1

7:45 a.m.-2:20 p.m.

1 stop9h 35m

Seattle/Tacoma Intl

qui 29/1

3:10 p.m.-5:23 p.m.

2 stops23h 13m

C$ 304

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

sex 9/1

7:50 p.m.-10:16 p.m.

Nonstop5h 26m

Seattle/Tacoma Intl

sáb 17/1

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

Nonstop4h 43m

C$ 310

TorontoSeattle

YYZ - SEA

YYZSEA

Toronto Pearson Intl

sáb 10/1

8:00 a.m.-2:38 p.m.

2 stops9h 38m

Seattle/Tacoma Intl

sáb 17/1

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

Nonstop4h 40m

C$ 317

LondonSeattle

YXU - SEA

YXUSEA

London

ter 20/1

5:10 a.m.-2:31 p.m.

2 stops12h 21m

Seattle/Tacoma Intl

qua 21/1

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

2 stops9h 46m

C$ 346

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

sáb 6/12

2:13 p.m.-8:54 p.m.

1 stop9h 41m

Seattle/Tacoma Intl

ter 9/12

8:10 a.m.-7:48 p.m.

1 stop8h 38m

C$ 412

MontrealSeattle

YUL - SEA

YULSEA

Montreal Pierre Elliott Trudeau Intl

sex 12/12

6:00 a.m.-11:15 p.m.

2 stops20h 15m

Seattle/Tacoma Intl

seg 15/12

3:25 p.m.-2:00 p.m.

2 stops19h 35m

C$ 417

TorontoSeattle

YKF - SEA

YKFSEA

Toronto Region of Waterloo Intl

sáb 10/1

7:00 p.m.-10:23 a.m.

2 stops18h 23m

Seattle/Tacoma Intl

sáb 17/1

3:40 p.m.-5:28 a.m.

3 stops34h 48m

C$ 548

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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$ 373.

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$ 562. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around C$ 802. 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$ 435. Flights in the morning are often more expensive with an average ticket price of C$ 849.

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$ 502 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$ 418 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 12% 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$ 285

Fastest flight time

5h 26m

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$ 285. The best round-trip flight deal from Region of Ontario to Seattle found on momondo in the last 72 hours is C$ 394.
The fastest flight from Region of Ontario to Seattle takes 5h 26m
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?

  • 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$ 185Free CancellationRating
7.2
3,163 reviews
Search WestJet flights
United AirlinesPriceFrom C$ 282Free CancellationRating
7.4
9,015 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom C$ 306Free CancellationRating
8.0
11,314 reviews
Search Alaska Airlines flights
Air CanadaPriceFrom C$ 346Free CancellationRating
7.1
10,459 reviews
Search Air Canada flights
DeltaPriceFrom C$ 380Free CancellationRating
7.9
8,007 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom C$ 417Free CancellationRating
7.8
2,809 reviews
Search Hawaiian Airlines flights

Travelling to a place near Seattle?

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

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