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$98+ Cheap flights from Washington to Ontario

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/23. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YYZ
mai 30 — jun 61
sáb 5/30
sáb 6/6
1 adult, Economy
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Cheap flight deals from Washington to Ontario

Cheapest flights from Washington to Ontario
Explore the most affordable flight options available from Washington to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on abril 30, 2026.

This Trip.com deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qui 8/272:30 pm
PDX
-
YYZ
1 stop7h 35m
WestJet
seg 8/318:00 am
YYZ
-
PDX
1 stop8h 50m
WestJet
Deal found 4/26$222
This Kiwi.com deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qua 8/52:30 pm
PDX
-
YYZ
1 stop7h 35m
WestJet
sex 8/79:00 am
YYZ
-
PDX
1 stop7h 50m
WestJet
Deal found 4/26$229
This FlightHub deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
seg 8/32:30 pm
PDX
-
YYZ
2 stops11h 40m
WestJet
sex 8/77:00 am
YYZ
-
PDX
1 stop9h 50m
WestJet
Deal found 4/26$243
This FlightHub deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qua 7/152:30 pm
PDX
-
YYZ
1 stop7h 35m
WestJet
ter 8/119:00 am
YYZ
-
PDX
1 stop7h 50m
WestJet
Deal found 4/26$247
This FlightHub deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qua 8/52:30 pm
PDX
-
YYZ
2 stops11h 40m
WestJet
dom 8/96:10 am
YYZ
-
PDX
2 stops10h 40m
WestJet
Deal found 4/26$254
This Kiwi.com deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
seg 8/32:30 pm
PDX
-
YYZ
1 stop12h 15m
WestJet
ter 8/119:00 am
YYZ
-
PDX
1 stop7h 50m
WestJet
Deal found 4/26$259
This Kiwi.com deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom 8/22:30 pm
PDX
-
YYZ
1 stop7h 35m
WestJet
seg 8/109:00 am
YYZ
-
PDX
1 stop7h 50m
WestJet
Deal found 4/26$260
This Trip.com deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qui 5/282:30 pm
PDX
-
YYZ
1 stop7h 35m
WestJet
seg 6/16:10 am
YYZ
-
PDX
2 stops10h 40m
WestJet
Deal found 4/27$269
This Justfly.com deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom 8/27:00 am
SEA
-
YYZ
2 stops11h 10m
WestJet
seg 8/1012:00 pm
YYZ
-
SEA
2 stops12h 00m
WestJet
Deal found 4/25$273
This FlightHub deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
seg 8/32:30 pm
PDX
-
YYZ
2 stops11h 40m
WestJet
sáb 8/810:25 pm
YYZ
-
PDX
1 stop18h 25m
WestJet
Deal found 4/26$274
This Trip.com deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qui 7/237:35 pm
SEA
-
YYZ
1 stop8h 20m
WestJet
sáb 8/18:00 pm
YYZ
-
SEA
1 stop16h 40m
WestJet
Deal found 4/26$274
This Kiwi.com deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
qui 5/1410:30 am
SEA
-
YYZ
1 stop9h 15m
WestJet
dom 5/176:10 am
YYZ
-
SEA
2 stops15h 35m
WestJet
Deal found 4/26$275

Find flight deals from Washington to Ontario

Keep the following information in mind while searching for Washington to Ontario flight deals. Data was last updated abril 30, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$222
(Trip.com)

One-way from

$98
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$379

Good round-trip deal

$486 or less

Good one-way deal

$298 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Toronto (YTO) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Toronto (YTO) flights.
Search Deals
From Washington to Ontario
Search Deals
One-way flight from Washington to Ontario
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($80 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals
Price to beat on a round-trip flight from Washington to Ontario.
Search Deals
Price to beat on a one-way flight from Washington to Ontario.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington to 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, Cheapflights users made 2,558,603 searches. Data last updated abril 30, 2026.
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

Cheapest round-trip

PortlandToronto

PDX - YYZ

PDXYYZ

Portland

qua 8/19

2:30 pm-12:55 pm

1 stop19h 25m

Toronto Pearson Intl

sex 8/21

6:10 am-1:50 pm

2 stops10h 40m

$299

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

qui 6/18

7:00 am-7:50 pm

1 stop9h 50m

Toronto Region of Waterloo Intl

ter 6/23

8:40 pm-9:40 am

1 stop16h 00m

$322

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

qui 6/18

7:00 am-7:50 pm

1 stop9h 50m

Toronto Region of Waterloo Intl

seg 6/22

8:40 pm-9:40 am

1 stop16h 00m

$322

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

ter 6/9

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

ter 6/16

8:40 pm-6:45 pm

1 stop25h 05m

$325

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

dom 6/7

11:52 pm-9:54 am

1 stop7h 02m

Toronto Pearson Intl

ter 6/9

5:15 pm-11:59 pm

1 stop9h 44m

$336

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

sáb 5/23

11:05 pm-1:30 pm

1 stop11h 25m

Toronto Pearson Intl

seg 6/1

5:45 pm-12:10 am

1 stop9h 25m

$336

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

qua 6/3

7:05 am-10:44 pm

1 stop12h 39m

Toronto Pearson Intl

qui 6/4

2:45 pm-10:39 pm

1 stop10h 54m

$336

SeattleHamilton

SEA - YHM

SEAYHM

Seattle/Tacoma Intl

qua 6/24

7:00 am-5:15 pm

1 stop7h 15m

Hamilton

dom 6/28

6:10 pm-9:40 am

1 stop18h 30m

$341

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

sex 6/5

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

sex 6/12

8:40 pm-6:45 pm

1 stop25h 05m

$341

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

sex 6/12

7:35 pm-7:50 pm

1 stop21h 15m

Toronto Region of Waterloo Intl

sex 6/19

8:40 pm-9:40 am

1 stop16h 00m

$341

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Washington to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Washington with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington to Ontario

How far ahead should I book a flight from State of Washington to Region of Ontario?

Booking 64 days in advance of your planned departure date is, on average, the best time to get cheap flights from State of Washington to Region of Ontario. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from State of Washington to Region of Ontario?

Currently, November is the cheapest month in which you can book a flight from State of Washington to Region of Ontario (average of $88). Flying from State of Washington to Region of Ontario in June is currently the most expensive (average of $165). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from WA to ON?

Find hourly flight availability from Washington to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated abril 30, 2026.

When flying from State of Washington to Region of Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from State of Washington to Region of Ontario

Explore weekly flight availability from Washington to Ontario. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated abril 30, 2026.

The most flights from USWA to CAON are scheduled on a Thursday (4 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 on average).

How much does it cost to fly round-trip from State of Washington to Region of Ontario?

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated abril 30, 2026.
Peruse reviews from past customers who have flown with Alaska Airlines,Delta, andUnited Airlines from Washington to Ontario to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
7.9
Good
12,319 reviews

Comfort

7.8

Boarding

8.1

Crew

8.5

Food

7.1

Entertainment

7.0

Overall

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Alaska Airlines
7.9
Good
12,319 reviews
Alaska Airlines
7.9
Good
12,319 reviews

Comfort

7.8

Boarding

8.1

Crew

8.5

Food

7.1

Entertainment

7.0

Overall

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Delta
7.9
Good
8,466 reviews
Alaska Airlines
7.9
Good
12,319 reviews

Comfort

7.8

Boarding

8.1

Crew

8.5

Food

7.1

Entertainment

7.0

Overall

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
United Airlines
7.4
Good
9,677 reviews
Alaska Airlines
7.9
Good
12,319 reviews

Comfort

7.8

Boarding

8.1

Crew

8.5

Food

7.1

Entertainment

7.0

Overall

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
WestJet
7.2
Good
3,328 reviews
Alaska Airlines
7.9
Good
12,319 reviews

Comfort

7.8

Boarding

8.1

Crew

8.5

Food

7.1

Entertainment

7.0

Overall

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Air Canada
7.1
Good
10,982 reviews
Alaska Airlines
7.9
Good
12,319 reviews

Comfort

7.8

Boarding

8.1

Crew

8.5

Food

7.1

Entertainment

7.0

Overall

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.

Related info for your journey

Find useful and relevant information for your journey from Washington to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from State of Washington to Region of Ontario?

    Departing from State of Washington to Region of Ontario will take you 7h 02m. State of Washington and Region of Ontario are separated by a distance of 2054 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from State of Washington to Region of Ontario one-way?

    To fly one-way, consider booking your trip with Alaska Airlines, which is currently one of the cheapest options available, starting at $80. WestJet flights start at $83 while deals on Air Canada start at $99 one-way.

  • Can I find deals for flights from Washington to Ontario that include hotel bookings?

    Yes. In addition to deals on Washington to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington to Ontario.

  • Can I find deals for business class flights from Washington to Ontario?

    Yes. Cheapflights offers flight deals from Washington to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from State of Washington to Region of Ontario?

    Currently, November is the cheapest month in which you can book a flight from State of Washington to Region of Ontario (average of $88). Flying from State of Washington to Region of Ontario in June is currently the most expensive (average of $165). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Alternative routes for Washington to Ontario

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Top 5 airlines flying from Washington to Ontario

Discover the top 5 airlines that operate flights from Washington to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated abril 30, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$138Average$412FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$150Average$547FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$167Average$500FlexibilityNo cancel feeOn-time69%
WestJetCheapest$222Average$347FlexibilityNo cancel feeOn-time60%
Alaska AirlinesCheapest$251Average$445FlexibilityNo cancel feeOn-time75%

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