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Cheap flights from Seattle to Ontario from $89

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Ontario departing on 1/25. 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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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
6:07 pm - 6:47 amSEA-YYZ
9h 40m1 stop
Multiple Airlines Logo
7:45 am - 2:20 pmYYZ-SEA
9h 35m1 stop
$243Multiple Airlines
Find Deal
jue., ene. 8 - lun., ene. 12
WestJet Logo
3:10 pm - 5:58 amSEA-YYZ
11h 48m2 stops
WestJet Logo
7:45 am - 2:20 pmYYZ-SEA
9h 35m1 stop
$244WestJet
Find Deal
jue., dic. 4 - jue., dic. 11
Multiple Airlines Logo
7:55 am - 3:35 pmSEA-YYZ
4h 40mnonstop
Multiple Airlines Logo
7:45 am - 2:20 pmYYZ-SEA
9h 35m1 stop
$245Multiple Airlines
Find Deal
mar., dic. 9 - mié., dic. 10
WestJet Logo
11:55 am - 11:39 pmSEA-YYZ
8h 44m2 stops
WestJet Logo
6:30 pm - 2:20 pmYYZ-SEA
22h 50m1 stop
$246WestJet
Find Deal
sáb., nov. 29 - sáb., dic. 6
Alaska Airlines Logo
7:55 am - 3:35 pmSEA-YYZ
4h 40mnonstop
Alaska Airlines Logo
4:45 pm - 7:18 pmYYZ-SEA
5h 33mnonstop
$251Alaska Airlines
Find Deal
mar., dic. 9 - mié., dic. 10
Air Canada Logo
10:05 am - 10:41 pmSEA-YYZ
9h 36m2 stops
Air Canada Logo
8:15 am - 2:31 pmYYZ-SEA
9h 16m2 stops
$252Air Canada
Find Deal
sáb., nov. 29 - sáb., dic. 6
Air Canada Logo
10:05 am - 10:41 pmSEA-YYZ
9h 36m2 stops
Air Canada Logo
7:50 pm - 10:16 pmYYZ-SEA
5h 26mnonstop
$253Air Canada
Find Deal
sáb., nov. 29 - sáb., dic. 6
Alaska Airlines Logo
7:55 am - 3:35 pmSEA-YYZ
4h 40mnonstop
Alaska Airlines Logo
4:45 pm - 7:18 pmYYZ-SEA
5h 33mnonstop
$262Alaska Airlines
Find Deal
mar., dic. 9 - jue., dic. 11
United Airlines Logo
5:00 am - 3:02 pmSEA-YYZ
7h 02m1 stop
United Airlines Logo
5:55 pm - 12:50 amYYZ-SEA
9h 55m1 stop
$286United Airlines
Find Deal
mar., dic. 9 - mar., dic. 9
United Airlines Logo
11:20 pm - 11:38 amSEA-YYZ
9h 18m1 stop
United Airlines Logo
3:00 pm - 10:32 pmYYZ-SEA
10h 32m1 stop
$296United Airlines
Find Deal
mar., mar. 10 - mié., mar. 11

WestJet flights from Seattle to Region of Ontario

Our best WestJet deals on Seattle to Region of Ontario flight tickets
WestJet
Dec 4
SEA3:10 pmSeattle/Tacoma Intl
11h 48m
2 stops
YYZ5:58 amToronto Pearson Intl
Dec 11
YYZ7:45 amToronto Pearson Intl
9h 35m
1 stop
SEA2:20 pmSeattle/Tacoma Intl
$244
Find similar
WestJet
Nov 29
SEA11:55 amSeattle/Tacoma Intl
8h 44m
2 stops
YYZ11:39 pmToronto Pearson Intl
Dec 6
YYZ6:30 pmToronto Pearson Intl
22h 50m
1 stop
SEA2:20 pmSeattle/Tacoma Intl
$246
Find similar
WestJet
Dec 6
SEA3:20 pmSeattle/Tacoma Intl
11h 53m
1 stop
YYZ6:13 amToronto Pearson Intl
Dec 9
YYZ7:45 amToronto Pearson Intl
9h 35m
1 stop
SEA2:20 pmSeattle/Tacoma Intl
$248
Find similar

Alaska Airlines flights from Seattle to Region of Ontario

Our best Alaska Airlines deals on Seattle to Region of Ontario flight tickets
Alaska Airlines
Dec 9
SEA7:55 amSeattle/Tacoma Intl
4h 40m
YYZ3:35 pmToronto Pearson Intl
Dec 10
YYZ4:45 pmToronto Pearson Intl
5h 33m
SEA7:18 pmSeattle/Tacoma Intl
$251
Find similar
Alaska Airlines
Dec 9
SEA7:55 amSeattle/Tacoma Intl
4h 40m
YYZ3:35 pmToronto Pearson Intl
Dec 11
YYZ4:45 pmToronto Pearson Intl
5h 33m
SEA7:18 pmSeattle/Tacoma Intl
$262
Find similar
Alaska Airlines
Feb 24
SEA8:00 amSeattle/Tacoma Intl
4h 35m
YYZ3:35 pmToronto Pearson Intl
Feb 28
YYZ4:45 pmToronto Pearson Intl
5h 20m
SEA7:05 pmSeattle/Tacoma Intl
$273
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Region of Ontario 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 832,500 searches. Data last updated noviembre 3, 2025.
Use the filters below to find and compare flights from Seattle to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

jue. 1/8

6:07 pm-6:47 am

1 stop9h 40m

Toronto Pearson Intl

lun. 1/12

7:45 am-2:20 pm

1 stop9h 35m

$243

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

jue. 12/4

3:10 pm-5:58 am

2 stops11h 48m

Toronto Pearson Intl

jue. 12/11

7:45 am-2:20 pm

1 stop9h 35m

$244

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

mar. 12/9

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

mié. 12/10

7:45 am-2:20 pm

1 stop9h 35m

$245

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

sáb. 11/29

11:55 am-11:39 pm

2 stops8h 44m

Toronto Pearson Intl

sáb. 12/6

6:30 pm-2:20 pm

1 stop22h 50m

$246

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

mar. 12/9

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

mié. 12/10

4:45 pm-7:18 pm

Nonstop5h 33m

$251

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

sáb. 11/29

10:05 am-10:41 pm

2 stops9h 36m

Toronto Pearson Intl

sáb. 12/6

8:15 am-2:31 pm

2 stops9h 16m

$252

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

sáb. 11/29

10:05 am-10:41 pm

2 stops9h 36m

Toronto Pearson Intl

sáb. 12/6

7:50 pm-10:16 pm

Nonstop5h 26m

$253

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

mar. 12/9

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

jue. 12/11

4:45 pm-7:18 pm

Nonstop5h 33m

$262

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

mar. 12/9

5:00 am-3:02 pm

1 stop7h 02m

Toronto Pearson Intl

mar. 12/9

5:55 pm-12:50 am

1 stop9h 55m

$286

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

mar. 3/10

11:20 pm-11:38 am

1 stop9h 18m

Toronto Pearson Intl

mié. 3/11

3:00 pm-10:32 pm

1 stop10h 32m

$296

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 Ontario from

How to get the cheapest flight ticket from Seattle to Region of Ontario

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 Region of Ontario?

The month of January is, on average, the cheapest month to fly to Region of Ontario from Seattle, with most prices found around $284. If you aren’t able to travel during the month of January, then book flights to Region of Ontario from Seattle during February instead. Flights to Region of Ontario in February, while not as cheap as those in January, still average around $286.

What is the cheapest day to depart on your flight to Region of Ontario?

According to our data, Tuesday is the cheapest day to fly to Region of Ontario from Seattle. The lowest ticket price found for a Tuesday departure recently was $549. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from Seattle to Region of Ontario on a Saturday will generally be more expensive and average around $715. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

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

According to our data, the cheapest time of day to fly to Region of Ontario is in the afternoon. momondo users have found flights departing from Seattle to Region of Ontario in the afternoon for as low as $283. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the evening are often more expensive with an average ticket price of $1,067.

What is the cheapest Seattle/Tacoma Intl to Ontario flight route?

Fly from Seattle/Tacoma Intl to Toronto Pearson Intl for the best Seattle/Tacoma Intl - Ontario flight prices

How far in advance should I book a flight to Region of Ontario?

You are more likely to see cheaper flights to Region of Ontario from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Region of Ontario for around $412 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Region of Ontario from Seattle for as low as $292 on momondo.

What cabin class options are available on Seattle/Tacoma Intl to Ontario flights?

There are 4 cabin classes available to choose from on Seattle/Tacoma Intl to Ontario 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 Seattle to Region of Ontario flights?

No. A direct flight is the cheapest option for a flight between Seattle to Region of Ontario.

Cheap Seattle to Region of Ontario flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Region of Ontario

Best Price Found

$262

Fastest flight time

4h 35m

Direct flights

Every day

Airports in Region of Ontario

1 airport
The best one-way flight to Region of Ontario from Seattle in the past 72 hours is $262. The best round-trip flight deal from Seattle to Region of Ontario found on momondo in the last 72 hours is $331.
The fastest flight from Seattle to Region of Ontario takes 4h 35m
Direct flights go from Seattle to Region of Ontario every day.
There is 1 airport near Region of Ontario: Toronto Pearson Intl (YYZ)
Search flight deals

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Ontario?

    Prices for flights from Seattle/Tacoma Intl Airport to Ontario are refreshed on a daily basis.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Ontario?

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

    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 Seattle/Tacoma Intl Airport to Ontario.

  • What documentation or ID do you need to fly to Ontario?

    The travel and health documents you'll need for your trip to Ontario 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 Ontario. 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 Seattle to Region of Ontario?

Best airlines flying from Seattle to Region of Ontario

Compare and see reviews for airlines that fly from Seattle to Region of Ontario with momondo
Airline
Rating
Free Cancellation
Price
Air CanadaPriceFrom $165Free CancellationRating
7.1
10,394 reviews
Search Air Canada flights
DeltaPriceFrom $182Free CancellationRating
7.9
8,001 reviews
Search Delta flights
WestJetPriceFrom $222Free CancellationRating
7.2
3,153 reviews
Search WestJet flights
Alaska AirlinesPriceFrom $253Free CancellationRating
8.0
11,235 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $282Free CancellationRating
7.4
8,997 reviews
Search United Airlines flights

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Seattle to Ontario. Millions of users trust and use momondo every year so you are in good hands.

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

Yes. All flights to Ontario from Seattle on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Seattle to Ontario?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Ontario from Seattle.

I’m not ready to book a flight from Seattle to Ontario right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Seattle to Ontario flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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