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$386+ Cheap flights from Santa Rosa (STS) to Ontario

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/23. Fares are subject to change and may not be available on all flights or dates of travel.
STS — YYZ
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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Cheap 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 December 12, 2025.

This Alaska Airlines deal was found by Cheapflights users on 12/9. 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 12/256:00 amSTS - YYZ
1 stop30h 35mAlaska Airlines
Mon 1/124:45 pmYYZ - STS
2 stops22h 37mAlaska Airlines
Deal found 12/9$690
This Alaska Airlines deal was found by Cheapflights users on 12/9. 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 12/256:00 amSTS - YYZ
1 stop30h 35mAlaska Airlines
Thu 1/84:45 pmYYZ - STS
1 stop10h 14mAlaska Airlines
Deal found 12/9$700
This Alaska Airlines deal was found by Cheapflights users on 12/9. 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 12/2512:03 pmSTS - YYZ
2 stops24h 32mAlaska Airlines
Fri 1/94:45 pmYYZ - STS
2 stops19h 13mAlaska Airlines
Deal found 12/9$724
This Alaska Airlines deal was found by Cheapflights users on 12/10. 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 12/256:00 amSTS - YYZ
1 stop30h 35mAlaska Airlines
Sun 1/114:45 pmYYZ - STS
1 stop10h 14mAlaska Airlines
Deal found 12/10$743
This Alaska Airlines deal was found by Cheapflights users on 12/11. 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 12/256:00 amSTS - YYZ
1 stop30h 35mAlaska Airlines
Sat 1/104:45 pmYYZ - STS
1 stop20h 50mAlaska Airlines
Deal found 12/11$758
This Alaska Airlines deal was found by Cheapflights users on 12/10. 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 12/256:00 amSTS - YYZ
1 stop30h 35mAlaska Airlines
Wed 1/74:45 pmYYZ - STS
2 stops30h 56mAlaska Airlines
Deal found 12/10$767
This American Airlines deal was found by Cheapflights users on 12/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1712:57 pmSTS - YUL
2 stops20h 23mAmerican Airlines
Thu 12/257:08 amYUL - STS
2 stops32h 21mAmerican Airlines
Deal found 12/10$1,081
This American Airlines deal was found by Cheapflights users on 12/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1712:57 pmSTS - YUL
2 stops20h 23mAmerican Airlines
Fri 12/263:59 pmYUL - STS
2 stops23h 30mAmerican Airlines
Deal found 12/10$1,189
This American Airlines deal was found by Cheapflights users on 12/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1712:57 pmSTS - YUL
2 stops23h 09mAmerican Airlines
Sat 12/277:30 amYUL - STS
2 stops31h 59mAmerican Airlines
Deal found 12/10$1,296
This American Airlines deal was found by Cheapflights users on 12/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/184:21 pmSTS - YUL
2 stops27h 18mAmerican Airlines
Tue 12/237:30 amYUL - STS
2 stops11h 21mAmerican Airlines
Deal found 12/10$1,404
This American Airlines deal was found by Cheapflights users on 12/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1912:59 pmSTS - YUL
2 stops23h 12mAmerican Airlines
Thu 12/257:08 amYUL - STS
2 stops32h 21mAmerican Airlines
Deal found 12/10$1,436
This American Airlines deal was found by Cheapflights users on 12/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/184:21 pmSTS - YUL
2 stops19h 45mAmerican Airlines
Sat 12/277:30 amYUL - STS
2 stops31h 59mAmerican Airlines
Deal found 12/10$1,511

Find 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 December 12, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$374
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$644
Provider with most accurate pricing for San Francisco-Toronto (YTO) flight deals.
Search Deals
Provider most trusted by Cheapflights users for San Francisco-Toronto (YTO) flights.
Search Deals
From Santa Rosa Sonoma County to Ontario
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($67 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($19 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 12, 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

Fri 1/23

6:30 pm-3:35 pm

2 stops18h 05m

Toronto Pearson Intl

Mon 1/26

4:45 pm-11:59 pm

1 stop10h 14m

$386

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Thu 1/22

6:30 pm-3:35 pm

2 stops18h 05m

Toronto Pearson Intl

Mon 1/26

4:45 pm-11:59 pm

1 stop10h 14m

$394

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Thu 1/8

6:30 pm-3:35 pm

2 stops18h 05m

Toronto Pearson Intl

Mon 1/12

4:45 pm-12:22 pm

2 stops22h 37m

$400

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Wed 1/21

7:00 am-3:35 pm

2 stops29h 35m

Toronto Pearson Intl

Sun 1/25

4:45 pm-11:59 pm

1 stop10h 14m

$409

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Thu 1/22

6:30 pm-3:35 pm

2 stops18h 05m

Toronto Pearson Intl

Sun 1/25

4:45 pm-9:56 am

2 stops20h 11m

$416

Santa RosaMontreal

STS - YUL

STSYUL

Santa Rosa Sonoma County

Sun 1/25

4:23 pm-3:08 pm

2 stops19h 45m

Montreal Pierre Elliott Trudeau Intl

Sun 2/1

3:50 pm-12:25 pm

2 stops23h 35m

$806

Santa RosaMontreal

STS - YUL

STSYUL

Santa Rosa Sonoma County

Fri 3/20

4:23 pm-12:19 pm

2 stops16h 56m

Montreal Pierre Elliott Trudeau Intl

Mon 3/23

4:00 pm-12:26 pm

2 stops23h 26m

$886

Santa RosaMontreal

STS - YUL

STSYUL

Santa Rosa Sonoma County

Wed 3/18

4:23 pm-12:24 pm

2 stops17h 01m

Montreal Pierre Elliott Trudeau Intl

Mon 3/23

7:12 am-3:53 pm

2 stops11h 41m

$886

Santa RosaMontreal

STS - YUL

STSYUL

Santa Rosa Sonoma County

Thu 3/19

4:23 pm-3:08 pm

2 stops19h 45m

Montreal Pierre Elliott Trudeau Intl

Mon 3/23

7:12 am-3:53 pm

2 stops11h 41m

$886

Santa RosaMontreal

STS - YUL

STSYUL

Santa Rosa Sonoma County

Wed 3/18

4:23 pm-3:08 pm

2 stops19h 45m

Montreal Pierre Elliott Trudeau Intl

Sun 3/22

2:25 pm-12:26 pm

2 stops25h 01m

$936

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

Showing 1-10 of 23 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 December is currently the most expensive (average of $217). 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 $386, Alaska Airlines can have you in Region of Ontario from Santa Rosa in 18h 05m. Airlines will cover a distance of 2250 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 Pearson Intl or Santa Rosa Sonoma County - Toronto Region of Waterloo Intl, Santa Rosa Sonoma County - Montreal Pierre Elliott Trudeau 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 December is currently the most expensive (average of $217). 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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