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Santa Rosa

$260+ 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 4/29. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — STS
Apr 18 — Apr 251
Sat 4/18
Sat 4/25
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 March 19, 2026.

This flugladen.de deal was found by Cheapflights users on 3/18. 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/307:00 am
YYZ
-
STS
2 stops15h 06m
Multiple Airlines
Thu 5/77:23 am
STS
-
YYZ
2 stops19h 22m
Multiple Airlines
Deal found 3/18$623
This Alaska Airlines deal was found by Cheapflights users on 3/16. 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 6/24:55 pm
YYZ
-
STS
2 stops28h 24m
Alaska Airlines
Wed 6/38:26 pm
STS
-
YYZ
1 stop16h 19m
Alaska Airlines
Deal found 3/16$626
This American Airlines deal was found by Cheapflights users on 3/16. 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 6/176:18 pm
YYZ
-
STS
1 stop20h 47m
American Airlines
Sun 6/281:00 pm
STS
-
YYZ
2 stops19h 59m
American Airlines
Deal found 3/16$628
This American Airlines deal was found by Cheapflights users on 3/16. 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 6/227:24 pm
YYZ
-
STS
2 stops19h 41m
American Airlines
Sun 6/281:00 pm
STS
-
YYZ
2 stops22h 30m
American Airlines
Deal found 3/16$643
This Alaska Airlines deal was found by Cheapflights users on 3/18. 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 4/304:55 pm
YYZ
-
STS
2 stops21h 03m
Alaska Airlines
Thu 5/77:46 pm
STS
-
YYZ
1 stop16h 59m
Alaska Airlines
Deal found 3/18$657
This American Airlines deal was found by Cheapflights users on 3/18. 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 9/306:15 am
YYZ
-
STS
2 stops12h 32m
American Airlines
Sun 10/44:21 pm
STS
-
YYZ
2 stops15h 24m
American Airlines
Deal found 3/18$660
This American Airlines deal was found by Cheapflights users on 3/16. 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 6/106:46 am
YYZ
-
STS
1 stop8h 19m
American Airlines
Tue 6/2312:45 pm
STS
-
YYZ
2 stops22h 50m
American Airlines
Deal found 3/16$662
This American Airlines deal was found by Cheapflights users on 3/19. 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.
Sun 12/206:00 am
YYZ
-
STS
2 stops12h 51m
American Airlines
Wed 12/2312:59 pm
STS
-
YYZ
2 stops18h 57m
American Airlines
Deal found 3/19$667
This American Airlines deal was found by Cheapflights users on 3/16. 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 6/106:26 pm
YYZ
-
STS
2 stops20h 39m
American Airlines
Wed 6/2412:45 pm
STS
-
YYZ
2 stops19h 14m
American Airlines
Deal found 3/16$668
This American Airlines deal was found by Cheapflights users on 3/17. 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 8/173:45 pm
YUL
-
STS
1 stop23h 27m
American Airlines
Sat 8/2212:35 pm
STS
-
YUL
1 stop23h 09m
American Airlines
Deal found 3/17$693
This American Airlines deal was found by Cheapflights users on 3/17. 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.
Sat 8/155:29 pm
YUL
-
STS
2 stops22h 06m
American Airlines
Tue 8/254:17 pm
STS
-
YUL
2 stops16h 18m
American Airlines
Deal found 3/17$708
This American Airlines deal was found by Cheapflights users on 3/17. 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.
Sun 8/165:29 pm
YUL
-
STS
2 stops21h 43m
American Airlines
Sat 8/2212:35 pm
STS
-
YUL
1 stop23h 09m
American Airlines
Deal found 3/17$719

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 March 19, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$623
(flugladen.de)

One-way from

$260
(Kiwi.com)

Popular in

December

Cheapest in

April

Average price

$409
Provider with most accurate pricing for Toronto (YTO)-San Francisco flight deals.
Search Deals
Provider most trusted by Cheapflights users for Toronto (YTO)-San Francisco flights.
Search Deals
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. 3% potential increase in price ($13 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 19, 2026.
Use the filters below to find and compare flights from Ontario to Santa Rosa that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

TorontoSanta Rosa

YYZ - STS

YYZSTS

Toronto Pearson Intl

Tue 6/2

4:55 pm-6:19 pm

2 stops28h 24m

Santa Rosa Sonoma County

Wed 6/3

8:26 pm-3:45 pm

1 stop16h 19m

$636

TorontoSanta Rosa

YYZ - STS

YYZSTS

Toronto Pearson Intl

Thu 4/30

4:55 pm-10:58 am

2 stops21h 03m

Santa Rosa Sonoma County

Thu 5/7

7:46 pm-3:45 pm

1 stop16h 59m

$657

TorontoSanta Rosa

YYZ - STS

YYZSTS

Toronto Pearson Intl

Sun 5/17

3:45 pm-12:26 pm

2 stops23h 41m

Santa Rosa Sonoma County

Sun 5/24

12:45 pm-1:57 pm

1 stop22h 12m

$683

TorontoSanta Rosa

YYZ - STS

YYZSTS

Toronto Pearson Intl

Sun 5/17

6:20 pm-12:26 pm

2 stops21h 06m

Santa Rosa Sonoma County

Mon 5/25

1:00 pm-10:59 am

2 stops18h 59m

$689

MontrealSanta Rosa

YUL - STS

YULSTS

Montreal Pierre Elliott Trudeau Intl

Fri 8/21

3:45 pm-12:12 pm

1 stop23h 27m

Santa Rosa Sonoma County

Mon 8/24

12:35 pm-2:44 pm

1 stop23h 09m

$693

MontrealSanta Rosa

YUL - STS

YULSTS

Montreal Pierre Elliott Trudeau Intl

Tue 8/18

3:45 pm-12:12 pm

1 stop23h 27m

Santa Rosa Sonoma County

Mon 8/24

12:35 pm-2:44 pm

1 stop23h 09m

$693

MontrealSanta Rosa

YUL - STS

YULSTS

Montreal Pierre Elliott Trudeau Intl

Wed 8/19

5:29 pm-12:35 pm

2 stops22h 06m

Santa Rosa Sonoma County

Thu 8/27

4:17 pm-11:35 am

2 stops16h 18m

$708

MontrealSanta Rosa

YUL - STS

YULSTS

Montreal Pierre Elliott Trudeau Intl

Sat 8/15

5:29 pm-12:35 pm

2 stops22h 06m

Santa Rosa Sonoma County

Tue 8/25

4:17 pm-11:35 am

2 stops16h 18m

$708

MontrealSanta Rosa

YUL - STS

YULSTS

Montreal Pierre Elliott Trudeau Intl

Wed 8/19

5:29 pm-12:35 pm

2 stops22h 06m

Santa Rosa Sonoma County

Wed 8/26

4:17 pm-4:44 pm

2 stops21h 27m

$708

TorontoSanta Rosa

YYZ - STS

YYZSTS

Toronto Pearson Intl

Fri 4/3

4:55 pm-9:03 am

2 stops19h 08m

Santa Rosa Sonoma County

Mon 4/6

6:53 pm-3:45 pm

1 stop17h 52m

$713

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/15

Showing 1-10 of 31 resultsSorted by cheapest first
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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, August is the cheapest month in which you can book a flight from Region of Ontario to Santa Rosa (average of $159). Flying from Region of Ontario to Santa Rosa in March is currently the most expensive (average of $254). 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 $683, Alaska Airlines can have you in Santa Rosa from Region of Ontario in 23h 41m. Airlines will cover a distance of 2250 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 Toronto Pearson Intl - Santa Rosa Sonoma County, Hamilton - Santa Rosa Sonoma County or Montreal Pierre Elliott Trudeau 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, August is the cheapest month in which you can book a flight from Region of Ontario to Santa Rosa (average of $159). Flying from Region of Ontario to Santa Rosa in March is currently the most expensive (average of $254). 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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