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Cheap flights from Washington to Ontario from $121

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington to Ontario departing on 12/16. 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

United Airlines Logo
11:50 pm - 10:26 amSEA-YOW
7h 36m1 stop
United Airlines Logo
2:15 pm - 8:56 pmYOW-SEA
9h 41m1 stop
$237United Airlines
Find Deal
Tue, Mar 3 - Wed, Mar 4
United Airlines Logo
2:14 pm - 10:26 amSEA-YOW
17h 12m2 stops
United Airlines Logo
2:15 pm - 8:56 pmYOW-SEA
9h 41m1 stop
$243United Airlines
Find Deal
Tue, Mar 3 - Wed, Mar 4
Air Canada Logo
2:55 pm - 6:10 amSEA-YYZ
12h 15m2 stops
Air Canada Logo
9:15 am - 6:36 pmYYZ-SEA
12h 21m2 stops
$248Air Canada
Find Deal
Tue, Oct 21 - Wed, Oct 22
WestJet Logo
8:40 am - 9:01 pmSEA-YYZ
9h 21m2 stops
WestJet Logo
7:45 am - 2:20 pmYYZ-SEA
9h 35m1 stop
$249WestJet
Find Deal
Fri, Oct 24 - Tue, Oct 28
WestJet Logo
2:05 pm - 5:51 amSEA-YYZ
12h 46m2 stops
WestJet Logo
10:25 pm - 7:21 pmYYZ-SEA
23h 56m1 stop
$250WestJet
Find Deal
Tue, Oct 14 - Fri, Oct 17
Alaska Airlines Logo
7:18 am - 3:00 pmSEA-YYZ
4h 42mnonstop
Alaska Airlines Logo
4:45 pm - 7:05 pmYYZ-SEA
5h 20mnonstop
$251Alaska Airlines
Find Deal
Sat, Oct 25 - Wed, Oct 29
Air Canada Logo
7:15 pm - 7:00 amSEA-YYZ
8h 45m1 stop
Air Canada Logo
10:25 am - 6:36 pmYYZ-SEA
11h 11m2 stops
$255Air Canada
Find Deal
Mon, Oct 20 - Tue, Oct 21
Alaska Airlines Logo
7:18 am - 3:00 pmSEA-YYZ
4h 42mnonstop
Alaska Airlines Logo
4:45 pm - 7:08 pmYYZ-SEA
5h 23mnonstop
$267Alaska Airlines
Find Deal
Tue, Oct 21 - Sat, Oct 25
Delta Logo
10:58 pm - 11:20 amPDX-YYZ
9h 22m1 stop
Delta Logo
1:20 pm - 10:08 pmYYZ-PDX
11h 48m1 stop
$341Delta
Find Deal
Fri, Oct 17 - Mon, Oct 20
Delta Logo
12:40 am - 11:47 amPDX-YYZ
8h 07m1 stop
Delta Logo
11:52 am - 10:08 pmYYZ-PDX
13h 16m1 stop
$357Delta
Find Deal
Sat, Oct 11 - Tue, Oct 14

WestJet flights from State of Washington to Region of Ontario

Our best WestJet deals on State of Washington to Region of Ontario flight tickets
WestJet
Oct 24
SEA8:40 amSeattle/Tacoma Intl
9h 21m
2 stops
YYZ9:01 pmToronto Pearson Intl
Oct 28
YYZ7:45 amToronto Pearson Intl
9h 35m
1 stop
SEA2:20 pmSeattle/Tacoma Intl
$249
Find similar
WestJet
Oct 14
SEA2:05 pmSeattle/Tacoma Intl
12h 46m
2 stops
YYZ5:51 amToronto Pearson Intl
Oct 17
YYZ10:25 pmToronto Pearson Intl
23h 56m
1 stop
SEA7:21 pmSeattle/Tacoma Intl
$250
Find similar
WestJet
Oct 17
SEA8:40 amSeattle/Tacoma Intl
9h 21m
2 stops
YYZ9:01 pmToronto Pearson Intl
Oct 26
YYZ7:45 amToronto Pearson Intl
9h 35m
1 stop
SEA2:20 pmSeattle/Tacoma Intl
$252
Find similar

Air Canada flights from State of Washington to Region of Ontario

Our best Air Canada deals on State of Washington to Region of Ontario flight tickets
Air Canada
Oct 21
SEA2:55 pmSeattle/Tacoma Intl
12h 15m
2 stops
YYZ6:10 amToronto Pearson Intl
Oct 22
YYZ9:15 amToronto Pearson Intl
12h 21m
2 stops
SEA6:36 pmSeattle/Tacoma Intl
$248
Find similar
Air Canada
Oct 20
SEA7:15 pmSeattle/Tacoma Intl
8h 45m
1 stop
YYZ7:00 amToronto Pearson Intl
Oct 21
YYZ10:25 amToronto Pearson Intl
11h 11m
2 stops
SEA6:36 pmSeattle/Tacoma Intl
$255
Find similar
Air Canada
Oct 18
SEA2:55 pmSeattle/Tacoma Intl
12h 35m
2 stops
YYZ6:30 amToronto Pearson Intl
Oct 22
YYZ10:25 amToronto Pearson Intl
11h 11m
2 stops
SEA6:36 pmSeattle/Tacoma Intl
$262
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from State of Washington 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 September 22, 2025.
Use the filters below to find and compare flights from Washington to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

Tue 3/3

11:50 pm-10:26 am

1 stop7h 36m

Ottawa

Wed 3/4

2:15 pm-8:56 pm

1 stop9h 41m

$237

SeattleOttawa

SEA - YOW

SEAYOW

Seattle/Tacoma Intl

Tue 3/3

2:14 pm-10:26 am

2 stops17h 12m

Ottawa

Wed 3/4

2:15 pm-8:56 pm

1 stop9h 41m

$243

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 10/21

2:55 pm-6:10 am

2 stops12h 15m

Toronto Pearson Intl

Wed 10/22

9:15 am-6:36 pm

2 stops12h 21m

$248

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 10/24

8:40 am-9:01 pm

2 stops9h 21m

Toronto Pearson Intl

Tue 10/28

7:45 am-2:20 pm

1 stop9h 35m

$249

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 10/14

2:05 pm-5:51 am

2 stops12h 46m

Toronto Pearson Intl

Fri 10/17

10:25 pm-7:21 pm

1 stop23h 56m

$250

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sat 10/25

7:18 am-3:00 pm

Nonstop4h 42m

Toronto Pearson Intl

Wed 10/29

4:45 pm-7:05 pm

Nonstop5h 20m

$251

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Mon 10/20

7:15 pm-7:00 am

1 stop8h 45m

Toronto Pearson Intl

Tue 10/21

10:25 am-6:36 pm

2 stops11h 11m

$255

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Tue 10/21

7:18 am-3:00 pm

Nonstop4h 42m

Toronto Pearson Intl

Sat 10/25

4:45 pm-7:08 pm

Nonstop5h 23m

$267

PortlandToronto

PDX - YYZ

PDXYYZ

Portland

Fri 10/17

10:58 pm-11:20 am

1 stop9h 22m

Toronto Pearson Intl

Mon 10/20

1:20 pm-10:08 pm

1 stop11h 48m

$341

PortlandToronto

PDX - YYZ

PDXYYZ

Portland

Sat 10/11

12:40 am-11:47 am

1 stop8h 07m

Toronto Pearson Intl

Tue 10/14

11:52 am-10:08 pm

1 stop13h 16m

$357

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 State of Washington 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 State of Washington, with most prices found around $282. If you aren’t able to travel during the month of January, then book flights to Region of Ontario from State of Washington 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 State of Washington. The lowest ticket price found for a Tuesday departure recently was $547. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from State of Washington to Region of Ontario on a Saturday will generally be more expensive and average around $705. 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 State of Washington 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 $627.

What is the cheapest Washington to Ontario flight route?

Fly from Seattle/Tacoma Intl to Toronto Pearson Intl for the best Washington - 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 State of Washington when booking weeks ahead of your departure date. In general, you can expect to find flights to Region of Ontario for around $420 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 State of Washington for as low as $292 on momondo.

What cabin class options are available on Washington to Ontario flights?

There are 4 cabin classes available to choose from on Washington 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 State of Washington to Region of Ontario flights?

You could potentially save up to 25% on your flight if you consider stops on a State of Washington to Region of Ontario flight.

Cheap State of Washington to Region of Ontario flight deals and tips

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

Best Price Found

$160

Fastest flight time

4h 35m

Direct flights

Every day

Airports in Region of Ontario

2 airports
The best one-way flight to Region of Ontario from State of Washington in the past 72 hours is $160. The best round-trip flight deal from State of Washington to Region of Ontario found on momondo in the last 72 hours is $365.
The fastest flight from State of Washington to Region of Ontario takes 4h 35m
Direct flights go from State of Washington to Region of Ontario every day.
There are 2 airports near Region of Ontario: Montreal Pierre Elliott Trudeau Intl (YUL), Toronto Pearson Intl (YYZ)
Search flight deals

  • When did momondo last update prices for flights from Washington to Ontario?

    Prices for flights from Washington to Ontario refresh daily.

  • How many operators does momondo search for flights from Washington to Ontario?

  • How old do you have to be to fly from Washington to Ontario?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington to Ontario.

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

    The required travel and health documents for your Ontario trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ontario. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from State of Washington to Region of Ontario?

Best airlines flying from State of Washington to Region of Ontario

Compare and see reviews for airlines that fly from State of Washington to Region of Ontario with momondo
Airline
Rating
Free Cancellation
Price
Air CanadaPriceFrom $128Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
DeltaPriceFrom $170Free CancellationRating
7.9
7,971 reviews
Search Delta flights
WestJetPriceFrom $228Free CancellationRating
7.2
3,102 reviews
Search WestJet flights
Alaska AirlinesPriceFrom $273Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $282Free CancellationRating
7.4
8,922 reviews
Search United Airlines flights

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Ontario from Washington.

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

Flights from Washington to Ontario with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once all potential Washington to Ontario flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

If you are not ready to book a flight from Washington to Ontario now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Ontario and let you know when they change.

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