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$189+ Cheap flights from Santa Rosa (STS) 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 11/19. Fares are subject to change and may not be available on all flights or dates of travel.
STS — YYZ
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Cheap flight deals from Santa Rosa to Ontario

Keep the following information in mind while searching for Santa Rosa to Ontario flight deals. Data was last updated October 30, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$482
(Alaska Airlines)

One-way from

$189
(Alaska Airlines)

Popular in

December

Cheapest in

April

Average price

$421
Provider with most accurate pricing for San Francisco-Toronto (YTO) flight deals.
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Provider most trusted by Cheapflights users for San Francisco-Toronto (YTO) flights.
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From Santa Rosa Sonoma County to Ontario
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One-way flight from Santa Rosa Sonoma County to Ontario
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Highest demand for flights based on searches. 10% potential increase in price ($50 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($16 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from Santa Rosa to Ontario

Cheapest flights from Santa Rosa to Ontario
Explore the most affordable flight options available from Santa Rosa to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2025.

This Alaska Airlines deal was found by Cheapflights users on 10/28. 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.
Tue 11/184:51 pmSTS - YYZ
2 stops19h 44mAlaska Airlines
Wed 11/264:45 pmYYZ - STS
1 stop24h 04mAlaska Airlines
Deal found 10/28$482
This Alaska Airlines deal was found by Cheapflights users on 10/29. 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.
Wed 11/1912:00 pmSTS - YYZ
2 stops24h 35mAlaska Airlines
Sat 11/224:45 pmYYZ - STS
1 stop28h 05mAlaska Airlines
Deal found 10/29$492
This Alaska Airlines deal was found by Cheapflights users on 10/28. 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.
Tue 12/167:50 amSTS - YYZ
2 stops28h 45mAlaska Airlines
Wed 12/244:45 pmYYZ - STS
1 stop8h 32mAlaska Airlines
Deal found 10/28$537
This Alaska Airlines deal was found by Cheapflights users on 10/28. 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.
Tue 11/1812:00 pmSTS - YYZ
2 stops24h 35mAlaska Airlines
Sun 11/234:45 pmYYZ - STS
1 stop28h 05mAlaska Airlines
Deal found 10/28$542
This Alaska Airlines deal was found by Cheapflights users on 10/28. 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.
Mon 12/152:21 pmSTS - YYZ
1 stop22h 14mAlaska Airlines
Wed 12/244:45 pmYYZ - STS
1 stop8h 32mAlaska Airlines
Deal found 10/28$547
This Alaska Airlines deal was found by Cheapflights users on 10/29. 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.
Wed 11/198:03 pmSTS - YYZ
2 stops16h 32mAlaska Airlines
Fri 11/214:45 pmYYZ - STS
1 stop24h 04mAlaska Airlines
Deal found 10/29$553
This Alaska Airlines deal was found by Cheapflights users on 10/30. 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.
Thu 11/202:22 pmSTS - YYZ
1 stop22h 13mAlaska Airlines
Wed 11/264:45 pmYYZ - STS
1 stop24h 04mAlaska Airlines
Deal found 10/30$557
This Alaska Airlines deal was found by Cheapflights users on 10/28. 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.
Wed 11/192:22 pmSTS - YYZ
1 stop22h 13mAlaska Airlines
Sun 11/234:45 pmYYZ - STS
1 stop28h 05mAlaska Airlines
Deal found 10/28$564
This Alaska Airlines deal was found by Cheapflights users on 10/28. 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.
Tue 12/167:50 amSTS - YYZ
2 stops28h 45mAlaska Airlines
Thu 12/254:45 pmYYZ - STS
1 stop8h 32mAlaska Airlines
Deal found 10/28$574

Cheapflights Fare Finder

 
Customize your flight search to find flights from Santa Rosa 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 October 30, 2025.
Use the filters below to find and compare flights from Santa Rosa to Ontario that are best for you.

Fly from

Santa Rosa

Fly to

Ontario

Route

Depart

Return

Price

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Wed 11/19

12:00 pm-3:35 pm

2 stops24h 35m

Toronto Pearson Intl

Sat 11/22

4:45 pm-5:50 pm

1 stop28h 05m

$492

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Tue 11/18

12:00 pm-3:35 pm

2 stops24h 35m

Toronto Pearson Intl

Sun 11/23

4:45 pm-5:50 pm

1 stop28h 05m

$542

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Tue 12/16

7:55 pm-3:35 pm

1 stop16h 40m

Toronto Pearson Intl

Wed 12/24

4:45 pm-10:17 pm

1 stop8h 32m

$547

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Mon 12/15

2:21 pm-3:35 pm

1 stop22h 14m

Toronto Pearson Intl

Wed 12/24

4:45 pm-10:17 pm

1 stop8h 32m

$547

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Wed 11/19

8:03 pm-3:35 pm

2 stops16h 32m

Toronto Pearson Intl

Fri 11/21

4:45 pm-1:49 pm

1 stop24h 04m

$553

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Wed 11/19

7:00 am-3:35 pm

1 stop29h 35m

Toronto Pearson Intl

Wed 11/26

4:45 pm-1:49 pm

1 stop24h 04m

$553

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Thu 11/20

2:22 pm-3:35 pm

1 stop22h 13m

Toronto Pearson Intl

Sat 11/22

4:45 pm-5:50 pm

1 stop28h 05m

$557

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Thu 11/20

2:22 pm-3:35 pm

1 stop22h 13m

Toronto Pearson Intl

Wed 11/26

4:45 pm-1:49 pm

1 stop24h 04m

$557

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Wed 11/19

2:22 pm-3:35 pm

1 stop22h 13m

Toronto Pearson Intl

Sun 11/23

4:45 pm-5:50 pm

1 stop28h 05m

$564

Santa RosaMontreal

STS - YUL

STSYUL

Santa Rosa Sonoma County

Thu 1/15

4:23 pm-3:08 pm

2 stops19h 45m

Montreal Pierre Elliott Trudeau Intl

Tue 1/20

3:52 pm-12:25 pm

2 stops23h 33m

$655

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

Showing 1-10 of 20 results
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Best time to book a flight from Santa Rosa to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Santa Rosa 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 Santa Rosa to Ontario

What is the cheapest month to book a flight from Santa Rosa to Region of Ontario?

Currently, February is the cheapest month in which you can book a flight from Santa Rosa to Region of Ontario (average of $127). Flying from Santa Rosa to Region of Ontario in August is currently the most expensive (average of $203). 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.

Related info for your journey

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

  • What airport do you fly from for flights from Santa Rosa to Ontario?

    Santa Rosa Sonoma County (STS), located 7.2 mi from the city center, is the airport you fly out of when you book flights from Santa Rosa to Ontario.

  • How long is the flight from Santa Rosa to Region of Ontario?

    For as low as $655, Alaska Airlines can have you in Region of Ontario from Santa Rosa in 19h 45m. Airlines will cover a distance of 2523 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the most popular routes from Santa Rosa to Region of Ontario?

    While some choose either Santa Rosa Sonoma County - Toronto Region of Waterloo Intl or Santa Rosa Sonoma County - Ottawa, Santa Rosa Sonoma County - Toronto Pearson Intl is the most popular route from Santa Rosa to Region of Ontario.

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

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

  • How can I find direct flights from Santa Rosa to Ontario?

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

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

    Yes. Cheapflights offers flight deals from Santa Rosa 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 Santa Rosa to Region of Ontario?

    Currently, February is the cheapest month in which you can book a flight from Santa Rosa to Region of Ontario (average of $127). Flying from Santa Rosa to Region of Ontario in August is currently the most expensive (average of $203). 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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