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Cheap flights from Washington to Ontario from $100

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 1/19. 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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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
11:55 am - 11:38 pm
SEA
-
YYZ
8h 43m2 stops
Multiple Airlines Logo
4:45 pm - 7:18 pm
YYZ
-
SEA
5h 33mnonstop
$245Multiple Airlines
Fri, Feb 27 - Fri, Mar 6
WestJet Logo
7:05 am - 6:52 pm
SEA
-
YYZ
8h 47m1 stop
WestJet Logo
6:30 am - 1:08 pm
YYZ
-
SEA
9h 38m1 stop
$246WestJet
Mon, May 25 - Fri, May 29
Alaska Airlines Logo
7:55 am - 3:35 pm
SEA
-
YYZ
4h 40mnonstop
Alaska Airlines Logo
4:45 pm - 7:18 pm
YYZ
-
SEA
5h 33mnonstop
$247Alaska Airlines
Sun, Feb 22 - Thu, Mar 5
WestJet Logo
3:10 pm - 5:58 am
SEA
-
YYZ
11h 48m2 stops
WestJet Logo
6:45 am - 1:08 pm
YYZ
-
SEA
9h 23m2 stops
$248WestJet
Fri, Apr 24 - Mon, Apr 27
WestJet Logo
3:35 pm - 5:50 am
SEA
-
YYZ
11h 15m2 stops
WestJet Logo
12:00 pm - 8:28 pm
YYZ
-
SEA
11h 28m2 stops
$249WestJet
Sun, Apr 26 - Fri, May 1
Air Canada Logo
8:10 am - 3:53 pm
SEA
-
YYZ
4h 43mnonstop
Air Canada Logo
7:50 pm - 10:16 pm
YYZ
-
SEA
5h 26mnonstop
$252Air Canada
Wed, Feb 18 - Wed, Feb 18
Air Canada Logo
3:15 pm - 5:38 am
PDX
-
YYZ
11h 23m2 stops
Air Canada Logo
8:15 am - 2:40 pm
YYZ
-
PDX
9h 25m2 stops
$274Air Canada
Sat, Jan 24 - Fri, Jan 30
Alaska Airlines Logo
5:35 pm - 3:35 pm
PDX
-
YYZ
19h 00m1 stop
Alaska Airlines Logo
4:45 pm - 10:46 pm
YYZ
-
PDX
9h 01m1 stop
$309Alaska Airlines
Fri, Jan 9 - Thu, Jan 22
United Airlines Logo
11:10 pm - 11:43 am
PDX
-
YYZ
9h 33m1 stop
United Airlines Logo
2:45 pm - 10:10 pm
YYZ
-
PDX
10h 25m1 stop
$317United Airlines
Tue, Apr 28 - Wed, Apr 29
United Airlines Logo
12:59 pm - 1:28 pm
PDX
-
YUL
21h 29m2 stops
United Airlines Logo
4:45 pm - 9:45 am
YUL
-
PDX
20h 00m2 stops
$387United Airlines
Fri, Jan 16 - Sat, Jan 17

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
May 25
SEA7:05 amSeattle/Tacoma Intl
8h 47m
1 stop
YYZ6:52 pmToronto Pearson Intl
May 29
YYZ6:30 amToronto Pearson Intl
9h 38m
1 stop
SEA1:08 pmSeattle/Tacoma Intl
$246
Find similar
WestJet
Apr 24
SEA3:10 pmSeattle/Tacoma Intl
11h 48m
2 stops
YYZ5:58 amToronto Pearson Intl
Apr 29
YYZ12:00 pmToronto Pearson Intl
11h 28m
2 stops
SEA8:28 pmSeattle/Tacoma Intl
$248
Find similar
WestJet
Apr 26
SEA3:35 pmSeattle/Tacoma Intl
11h 15m
2 stops
YYZ5:50 amToronto Pearson Intl
May 1
YYZ12:00 pmToronto Pearson Intl
11h 28m
2 stops
SEA8:28 pmSeattle/Tacoma Intl
$249
Find similar

Alaska Airlines flights from State of Washington to Region of Ontario

Our best Alaska Airlines deals on State of Washington to Region of Ontario flight tickets
Alaska Airlines
Feb 22
SEA7:55 amSeattle/Tacoma Intl
4h 40m
YYZ3:35 pmToronto Pearson Intl
Mar 5
YYZ4:45 pmToronto Pearson Intl
5h 33m
SEA7:18 pmSeattle/Tacoma Intl
$247
Find similar
Alaska Airlines
Apr 25
SEA7:55 amSeattle/Tacoma Intl
4h 40m
YYZ3:35 pmToronto Pearson Intl
Apr 29
YYZ4:45 pmToronto Pearson Intl
5h 20m
SEA7:05 pmSeattle/Tacoma Intl
$296
Find similar
Alaska Airlines
Jan 9
PDX5:35 pmPortland
19h 00m
1 stop
YYZ3:35 pmToronto Pearson Intl
Jan 22
YYZ4:45 pmToronto Pearson Intl
9h 01m
1 stop
PDX10:46 pmPortland
$309
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 December 18, 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

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 2/27

11:55 am-11:38 pm

2 stops8h 43m

Toronto Pearson Intl

Fri 3/6

4:45 pm-7:18 pm

Nonstop5h 33m

$245

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Mon 5/25

7:05 am-6:52 pm

1 stop8h 47m

Toronto Pearson Intl

Fri 5/29

6:30 am-1:08 pm

1 stop9h 38m

$246

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sun 2/22

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

Thu 3/5

4:45 pm-7:18 pm

Nonstop5h 33m

$247

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Fri 4/24

3:10 pm-5:58 am

2 stops11h 48m

Toronto Pearson Intl

Mon 4/27

6:45 am-1:08 pm

2 stops9h 23m

$248

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Sun 4/26

3:35 pm-5:50 am

2 stops11h 15m

Toronto Pearson Intl

Fri 5/1

12:00 pm-8:28 pm

2 stops11h 28m

$249

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

Wed 2/18

8:10 am-3:53 pm

Nonstop4h 43m

Toronto Pearson Intl

Wed 2/18

7:50 pm-10:16 pm

Nonstop5h 26m

$252

PortlandToronto

PDX - YYZ

PDXYYZ

Portland

Sat 1/24

3:15 pm-5:38 am

2 stops11h 23m

Toronto Pearson Intl

Fri 1/30

8:15 am-2:40 pm

2 stops9h 25m

$274

PortlandToronto

PDX - YYZ

PDXYYZ

Portland

Fri 1/9

5:35 pm-3:35 pm

1 stop19h 00m

Toronto Pearson Intl

Thu 1/22

4:45 pm-10:46 pm

1 stop9h 01m

$309

PortlandToronto

PDX - YYZ

PDXYYZ

Portland

Tue 4/28

11:10 pm-11:43 am

1 stop9h 33m

Toronto Pearson Intl

Wed 4/29

2:45 pm-10:10 pm

1 stop10h 25m

$317

PortlandMontreal

PDX - YUL

PDXYUL

Portland

Fri 1/16

12:59 pm-1:28 pm

2 stops21h 29m

Montreal Pierre Elliott Trudeau Intl

Sat 1/17

4:45 pm-9:45 am

2 stops20h 00m

$387

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 November is, on average, the cheapest month to fly to Region of Ontario from State of Washington, with most prices found around $274. If you aren’t able to travel during the month of November, then book flights to Region of Ontario from State of Washington during January instead. Flights to Region of Ontario in January, while not as cheap as those in November, still average around $283.

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 $539. 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 $712. 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 morning are often more expensive with an average ticket price of $615.

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 $413 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?

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

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

$154

Fastest flight time

4h 35m

Direct flights

Every day

Airports in Region of Ontario

123 airports
The best one-way flight to Region of Ontario from State of Washington in the past 72 hours is $154. The best round-trip flight deal from State of Washington to Region of Ontario found on momondo in the last 72 hours is $382.
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 123 airports in Region of Ontario. From State of Washington there are direct flights to 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
DeltaPriceFrom $142Free CancellationRating
7.9
8,009 reviews
Search Delta flights
Air CanadaPriceFrom $151Free CancellationRating
7.1
10,534 reviews
Search Air Canada flights
United AirlinesPriceFrom $173Free CancellationRating
7.4
9,093 reviews
Search United Airlines flights
WestJetPriceFrom $226Free CancellationRating
7.2
3,204 reviews
Search WestJet flights
Alaska AirlinesPriceFrom $253Free CancellationRating
8.0
11,478 reviews
Search Alaska 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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