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Santa Rosa

$294+ Cheap flights from Ontario to Santa Rosa (STS)

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 5/20. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — STS
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap flight deals from Ontario to Santa Rosa

Cheapest flights from Ontario to Santa Rosa
Explore the most affordable flight options available from Ontario to Santa Rosa. 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.
Fri 2/274:45 pm
YYZ
-
STS
2 stops20h 26m
Alaska Airlines
Mon 3/23:12 pm
STS
-
YYZ
2 stops21h 23m
Alaska Airlines
Deal found 1/27$420
This Alaska Airlines deal was found by Cheapflights users on 1/29. 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.
Mon 3/164:45 pm
YYZ
-
STS
2 stops29h 32m
Alaska Airlines
Tue 3/247:05 am
STS
-
YYZ
2 stops29h 30m
Alaska Airlines
Deal found 1/29$429
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/24:45 pm
YYZ
-
STS
2 stops29h 32m
Alaska Airlines
Mon 3/167:57 pm
STS
-
YYZ
1 stop16h 38m
Alaska Airlines
Deal found 1/28$448
This American Airlines deal was found by Cheapflights users on 1/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/196:00 am
YYZ
-
STS
2 stops12h 53m
American Airlines
Wed 2/254:23 pm
STS
-
YYZ
2 stops15h 35m
American Airlines
Deal found 1/29$503
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/137:30 am
YUL
-
STS
2 stops11h 23m
American Airlines
Fri 3/204:23 pm
STS
-
YUL
2 stops16h 59m
American Airlines
Deal found 1/27$745
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/297:30 am
YYZ
-
STS
2 stops11h 23m
American Airlines
Tue 2/34:23 pm
STS
-
YYZ
2 stops16h 36m
American Airlines
Deal found 1/27$878

Find flight deals from Ontario to Santa Rosa

Keep the following information in mind while searching for Ontario to Santa Rosa flight deals. Data was last updated January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$420
(Alaska Airlines)

One-way from

$294
(Alaska Airlines)

Popular in

December

Cheapest in

March

Average price

$373
Provider with most accurate pricing for Toronto (YTO)-San Francisco flight deals.
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Provider most trusted by Cheapflights users for Toronto (YTO)-San Francisco flights.
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From Ontario to Santa Rosa Sonoma County
Search Deals
One-way flight from Ontario to Santa Rosa Sonoma County
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($27 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 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 Ontario to Santa Rosa 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 Ontario to Santa Rosa that are best for you.

Fly from

Ontario

Fly to

Santa Rosa

Route

Depart

Return

Price

TorontoSanta Rosa

YYZ - STS

YYZSTS

Toronto Pearson Intl

Fri 2/27

4:45 pm-10:11 am

2 stops20h 26m

Santa Rosa Sonoma County

Mon 3/2

7:57 pm-3:35 pm

1 stop16h 38m

$420

TorontoSanta Rosa

YYZ - STS

YYZSTS

Toronto Pearson Intl

Mon 3/16

4:45 pm-7:17 pm

2 stops29h 32m

Santa Rosa Sonoma County

Tue 3/24

7:05 am-3:35 pm

2 stops29h 30m

$429

TorontoSanta Rosa

YYZ - STS

YYZSTS

Toronto Pearson Intl

Mon 3/2

4:45 pm-10:32 am

1 stop20h 47m

Santa Rosa Sonoma County

Mon 3/16

7:57 pm-3:35 pm

1 stop16h 38m

$454

TorontoSanta Rosa

YYZ - STS

YYZSTS

Toronto Pearson Intl

Thu 2/19

6:00 am-3:53 pm

2 stops12h 53m

Santa Rosa Sonoma County

Wed 2/25

4:23 pm-10:58 am

2 stops15h 35m

$503

MontrealSanta Rosa

YUL - STS

YULSTS

Montreal Pierre Elliott Trudeau Intl

Fri 3/13

7:30 am-3:53 pm

2 stops11h 23m

Santa Rosa Sonoma County

Fri 3/20

4:23 pm-12:22 pm

2 stops16h 59m

$745

TorontoSanta Rosa

YYZ - STS

YYZSTS

Toronto Pearson Intl

Wed 5/20

4:55 pm-12:13 pm

1 stop22h 18m

$294

TorontoSanta Rosa

YYZ - STS

YYZSTS

Toronto Pearson Intl

Wed 5/20

3:14 pm-12:25 pm

2 stops24h 11m

$304

TorontoSanta Rosa

YYZ - STS

YYZSTS

Toronto Pearson Intl

Fri 3/13

4:45 pm-11:50 pm

1 stop10h 05m

$305

TorontoSanta Rosa

YYZ - STS

YYZSTS

Toronto Pearson Intl

Fri 5/22

6:22 pm-12:25 pm

1 stop21h 03m

$350

TorontoSanta Rosa

YYZ - STS

YYZSTS

Toronto Pearson Intl

Thu 5/21

2:55 pm-12:25 pm

1 stop24h 30m

$350

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

Showing 1-10 of 23 results
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Best time to book a flight from Ontario to Santa Rosa

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

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

Currently, April is the cheapest month in which you can book a flight from Region of Ontario to Santa Rosa (average of $144). Flying from Region of Ontario to Santa Rosa in January is currently the most expensive (average of $243). 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 Ontario to Santa Rosa. 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 into for flights to Santa Rosa from Ontario?

    Located just 7.2 mi from the city center, Santa Rosa Sonoma County (STS) is the airport most travelers will use when flying to Santa Rosa from Ontario.

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

    For as low as $745, Alaska Airlines can have you in Santa Rosa from Region of Ontario in 11h 23m. Airlines will cover a distance of 2523 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    When deciding which route to take from Region of Ontario to Santa Rosa consider Hamilton - Santa Rosa Sonoma County, Montreal Pierre Elliott Trudeau Intl - Santa Rosa Sonoma County or Toronto Pearson Intl - Santa Rosa Sonoma County as they are the most popular.

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

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

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

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

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

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

    Currently, April is the cheapest month in which you can book a flight from Region of Ontario to Santa Rosa (average of $144). Flying from Region of Ontario to Santa Rosa in January is currently the most expensive (average of $243). 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

Traveling to a place near Santa Rosa?

Book flights to Santa Rosa if you plan to visit one of these locations
Fort Bragg
Ukiah

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