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$100+ 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 1/19. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — YYZ
ene. 14 — ene. 211
mié. 1/14
mié. 1/21
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 diciembre 15, 2025.

This Air Canada deal was found by Cheapflights users on 12/13. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/318:10 amSEA - YYZ
Nonstop4h 43mAir Canada
mié. 1/77:50 pmYYZ - SEA
Nonstop5h 26mAir Canada
Deal found 12/13$408
This Alaska Airlines deal was found by Cheapflights users on 12/13. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/315:10 amPDX - YYZ
1 stop7h 25mAlaska Airlines
mié. 1/74:45 pmYYZ - PDX
1 stop9h 01mAlaska Airlines
Deal found 12/13$416
This oojo deal was found by Cheapflights users on 12/13. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/313:10 pmSEA - YYZ
2 stops11h 48mWestJet
mié. 1/710:15 pmYYZ - SEA
1 stop19h 05mWestJet
Deal found 12/13$426
This United Airlines deal was found by Cheapflights users on 12/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/317:00 amSEA - YYZ
1 stop11h 21mUnited Airlines
mié. 1/76:50 amYYZ - SEA
1 stop7h 42mUnited Airlines
Deal found 12/13$433
This Air Canada deal was found by Cheapflights users on 12/13. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 12/278:00 pmSEA - YYZ
1 stop7h 47mAir Canada
mar. 1/68:55 pmYYZ - SEA
2 stops15h 20mAir Canada
Deal found 12/13$451
This Air Canada deal was found by Cheapflights users on 12/15. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/313:15 pmPDX - YYZ
2 stops11h 23mAir Canada
mié. 1/79:50 pmYYZ - PDX
2 stops14h 25mAir Canada
Deal found 12/15$478
This United Airlines deal was found by Cheapflights users on 12/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 12/277:00 amSEA - YYZ
1 stop11h 21mUnited Airlines
mar. 1/66:50 amYYZ - SEA
1 stop14h 24mUnited Airlines
Deal found 12/13$486
This Kiwi.com deal was found by Cheapflights users on 12/13. 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.
mié. 12/317:55 pmSEA - YYZ
1 stop8h 55mMultiple Airlines
dom. 1/410:15 pmYYZ - SEA
2 stops36h 42mMultiple Airlines
Deal found 12/13$501
This Kiwi.com deal was found by Cheapflights users on 12/13. 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.
mar. 12/168:18 pmSEA - YYZ
2 stops20h 18mMultiple Airlines
lun. 1/127:55 pmYYZ - SEA
1 stop16h 58mMultiple Airlines
Deal found 12/13$544
This Kiwi.com deal was found by Cheapflights users on 12/15. 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. 12/285:45 pmSEA - YYZ
1 stop9h 55mMultiple Airlines
dom. 1/410:15 pmYYZ - SEA
2 stops36h 42mMultiple Airlines
Deal found 12/15$578
This Kiwi.com deal was found by Cheapflights users on 12/12. 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.
sáb. 12/2711:10 pmSEA - YYZ
1 stop29h 40mMultiple Airlines
dom. 1/410:15 pmYYZ - SEA
2 stops36h 42mMultiple Airlines
Deal found 12/12$593
This United Airlines deal was found by Cheapflights users on 12/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 12/2811:55 pmPDX - YYZ
1 stop13h 07mUnited Airlines
mié. 12/316:10 amYYZ - PDX
1 stop16h 33mUnited Airlines
Deal found 12/15$599

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 diciembre 15, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$250
(Kiwi.com)

One-way from

$100
(Kiwi.com)

Popular in

December

Cheapest in

November

Average price

$553

Good round-trip deal

$382 or less

Good one-way deal

$154 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
High demand for flights, 6% potential price rise
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 diciembre 15, 2025.
Use the filters below to find and compare flights from Washington to Ontario that are best for you.

Fly from

Washington

Fly to

Ontario

Route

Depart

Return

Price

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

mié. 3/18

3:10 pm-5:29 am

1 stop11h 19m

Toronto Region of Waterloo Intl

mar. 3/24

6:20 am-2:19 pm

1 stop10h 59m

$251

SeattleToronto

SEA - YKF

SEAYKF

Seattle/Tacoma Intl

mié. 3/11

3:10 pm-5:29 am

1 stop11h 19m

Toronto Region of Waterloo Intl

sáb. 3/14

7:00 pm-2:19 pm

1 stop22h 19m

$251

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

vie. 1/30

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

dom. 2/1

4:45 pm-7:17 pm

Nonstop5h 32m

$254

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

jue. 3/5

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

sáb. 3/7

4:45 pm-7:18 pm

Nonstop5h 33m

$262

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

mié. 1/14

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

jue. 1/22

4:45 pm-7:17 pm

Nonstop5h 32m

$262

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

mié. 1/7

11:45 pm-11:48 am

1 stop9h 03m

Toronto Pearson Intl

jue. 1/8

3:45 pm-10:59 pm

1 stop10h 14m

$264

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

lun. 1/5

11:15 pm-6:57 pm

1 stop16h 42m

Toronto Pearson Intl

mar. 1/6

9:00 pm-4:29 pm

2 stops22h 29m

$273

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

jue. 3/5

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

lun. 3/9

4:45 pm-7:18 pm

Nonstop5h 33m

$273

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

vie. 3/6

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

lun. 3/9

4:45 pm-7:18 pm

Nonstop5h 33m

$273

SeattleToronto

SEA - YYZ

SEAYYZ

Seattle/Tacoma Intl

vie. 1/9

7:55 am-3:35 pm

Nonstop4h 40m

Toronto Pearson Intl

vie. 1/16

4:45 pm-7:17 pm

Nonstop5h 32m

$273

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

Showing 1-10 of 60 results
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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

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

Currently, March is the cheapest month in which you can book a flight from State of Washington to Region of Ontario (average of $121). Flying from State of Washington to Region of Ontario in December is currently the most expensive (average of $261). 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 diciembre 15, 2025.

It’s typically best to fly out from State of Washington to Region of Ontario in the afternoon. Doing so could potentially save you 51% on the flight price compared to flying in the morning, which is usually more expensive.

What is the cheapest day to fly from State of Washington to Region of Ontario?

Use this chart to determine the cheapest time to fly round-trip from Washington to Ontario. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their State of Washington to Region of Ontario flight should consider departing on Wednesday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 diciembre 15, 2025.

The most flights from USWA to CAON are scheduled on a Monday (6 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (2 on average).

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 diciembre 15, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Delta, and United 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
8.0
Very good
11,452 reviews

Overall

8.0

Comfort

7.8

Entertainment

7.0

Food

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Alaska Airlines
8.0
Very good
11,452 reviews
Alaska Airlines
8.0
Very good
11,452 reviews

Overall

8.0

Comfort

7.8

Entertainment

7.0

Food

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Delta
7.9
Good
8,008 reviews
Alaska Airlines
8.0
Very good
11,452 reviews

Overall

8.0

Comfort

7.8

Entertainment

7.0

Food

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
United Airlines
7.4
Good
9,092 reviews
Alaska Airlines
8.0
Very good
11,452 reviews

Overall

8.0

Comfort

7.8

Entertainment

7.0

Food

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
WestJet
7.2
Good
3,202 reviews
Alaska Airlines
8.0
Very good
11,452 reviews

Overall

8.0

Comfort

7.8

Entertainment

7.0

Food

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Air Canada
7.1
Good
10,525 reviews
Alaska Airlines
8.0
Very good
11,452 reviews

Overall

8.0

Comfort

7.8

Entertainment

7.0

Food

7.1

Boarding

8.1

Crew

8.5

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.

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 4h 40m. 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 WestJet, which is currently one of the cheapest options available, starting at $83. Alaska Airlines flights start at $100 while deals on Air Canada start at $111 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, March is the cheapest month in which you can book a flight from State of Washington to Region of Ontario (average of $121). Flying from State of Washington to Region of Ontario in December is currently the most expensive (average of $261). 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.

See more FAQs

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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 diciembre 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$142Average$398FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$151Average$609FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$173Average$534FlexibilityNo cancel feeOn-time69%
WestJetCheapest$226Average$347FlexibilityNo cancel feeOn-time60%
Alaska AirlinesCheapest$253Average$478FlexibilityNo cancel feeOn-time75%

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