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$203+ 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 5/6. Fares are subject to change and may not be available on all flights or dates of travel.
STS — YYZ
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
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 January 29, 2026.

This Alaska Airlines deal was found by Cheapflights users on 1/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/176:50 pm
STS
-
YYZ
2 stops17h 45m
Alaska Airlines
Tue 2/244:45 pm
YYZ
-
STS
1 stop20h 47m
Alaska Airlines
Deal found 1/27$480
This Alaska Airlines deal was found by Cheapflights users on 1/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/176:50 pm
STS
-
YYZ
2 stops17h 45m
Alaska Airlines
Thu 2/264:45 pm
YYZ
-
STS
1 stop10h 05m
Alaska Airlines
Deal found 1/27$485
This Alaska Airlines deal was found by Cheapflights users on 1/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/177:57 pm
STS
-
YYZ
1 stop16h 38m
Alaska Airlines
Mon 2/234:45 pm
YYZ
-
STS
1 stop20h 47m
Alaska Airlines
Deal found 1/27$490
This Alaska Airlines deal was found by Cheapflights users on 1/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/176:50 pm
STS
-
YYZ
2 stops17h 45m
Alaska Airlines
Fri 2/274:45 pm
YYZ
-
STS
2 stops20h 26m
Alaska Airlines
Deal found 1/27$491
This Alaska Airlines deal was found by Cheapflights users on 1/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/176:50 pm
STS
-
YYZ
2 stops17h 45m
Alaska Airlines
Sat 2/214:45 pm
YYZ
-
STS
1 stop20h 47m
Alaska Airlines
Deal found 1/27$505
This Alaska Airlines deal was found by Cheapflights users on 1/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/207:57 pm
STS
-
YYZ
1 stop16h 38m
Alaska Airlines
Fri 2/274:45 pm
YYZ
-
STS
2 stops20h 26m
Alaska Airlines
Deal found 1/27$506
This Alaska Airlines deal was found by Cheapflights users on 1/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/207:57 pm
STS
-
YYZ
1 stop16h 38m
Alaska Airlines
Thu 2/264:45 pm
YYZ
-
STS
2 stops19h 29m
Alaska Airlines
Deal found 1/27$512
This Alaska Airlines deal was found by Cheapflights users on 1/28. 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 3/167:57 pm
STS
-
YYZ
1 stop16h 38m
Alaska Airlines
Fri 3/204:45 pm
YYZ
-
STS
1 stop20h 45m
Alaska Airlines
Deal found 1/28$515
This Alaska Airlines deal was found by Cheapflights users on 1/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/276:53 pm
STS
-
YYZ
1 stop17h 42m
Alaska Airlines
Fri 4/34:55 pm
YYZ
-
STS
1 stop28h 06m
Alaska Airlines
Deal found 1/27$520
This Alaska Airlines deal was found by Cheapflights users on 1/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/187:57 pm
STS
-
YYZ
1 stop16h 38m
Alaska Airlines
Mon 2/234:45 pm
YYZ
-
STS
1 stop20h 47m
Alaska Airlines
Deal found 1/27$524
This American Airlines deal was found by Cheapflights users on 1/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/264:26 pm
STS
-
YUL
2 stops16h 57m
American Airlines
Wed 5/273:45 pm
YUL
-
STS
1 stop23h 40m
American Airlines
Deal found 1/28$800
This American Airlines deal was found by Cheapflights users on 1/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/151:07 pm
STS
-
YUL
2 stops19h 37m
American Airlines
Tue 6/162:30 pm
YUL
-
STS
2 stops28h 23m
American Airlines
Deal found 1/28$805

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 January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$480
(Alaska Airlines)

One-way from

$203
(Alaska Airlines)

Popular in

December

Cheapest in

February

Average price

$392
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
One-way flight from Santa Rosa Sonoma County to Ontario
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($60 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 January 29, 2026.
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 2/20

7:57 pm-3:35 pm

1 stop16h 38m

Toronto Pearson Intl

Tue 2/24

4:45 pm-10:32 am

1 stop20h 47m

$490

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Fri 2/20

7:57 pm-3:35 pm

1 stop16h 38m

Toronto Pearson Intl

Mon 2/23

4:45 pm-10:32 am

1 stop20h 47m

$490

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Fri 3/27

6:53 pm-3:35 pm

1 stop17h 42m

Toronto Pearson Intl

Sun 4/5

4:55 pm-6:01 pm

1 stop28h 06m

$495

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Fri 2/20

7:57 pm-3:35 pm

1 stop16h 38m

Toronto Pearson Intl

Fri 2/27

4:45 pm-10:11 am

2 stops20h 26m

$506

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Tue 2/17

7:57 pm-3:35 pm

1 stop16h 38m

Toronto Pearson Intl

Wed 2/25

4:45 pm-9:14 am

2 stops19h 29m

$512

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Fri 2/20

7:57 pm-3:35 pm

1 stop16h 38m

Toronto Pearson Intl

Thu 2/26

4:45 pm-9:14 am

2 stops19h 29m

$512

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Sat 3/28

6:53 pm-3:45 pm

1 stop17h 52m

Toronto Pearson Intl

Sat 4/4

4:55 pm-6:01 pm

1 stop28h 06m

$512

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Mon 3/16

7:57 pm-3:35 pm

1 stop16h 38m

Toronto Pearson Intl

Fri 3/20

4:45 pm-6:01 pm

1 stop28h 16m

$515

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Tue 2/17

7:57 pm-3:35 pm

1 stop16h 38m

Toronto Pearson Intl

Sat 2/21

4:45 pm-10:32 am

1 stop20h 47m

$515

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Wed 2/18

7:57 pm-3:35 pm

1 stop16h 38m

Toronto Pearson Intl

Mon 2/23

4:45 pm-10:32 am

1 stop20h 47m

$524

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

Showing 1-10 of 35 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 $270). 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 $490, Alaska Airlines can have you in Region of Ontario from Santa Rosa in 16h 38m. 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 - Montreal Pierre Elliott Trudeau Intl or Santa Rosa Sonoma County - Toronto Region of Waterloo Intl, 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 December is currently the most expensive (average of $270). 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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