HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$158+ 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 10/8. Fares are subject to change and may not be available on all flights or dates of travel.
STS — YYZ
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Santa Rosa to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 September 15, 2025.

Round-trip from

$357
(Kiwi.com)

One-way from

$158
(Kiwi.com)

Popular in

December

Cheapest in

April

Average price

$450
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. 11% potential increase in price ($58 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 September 2025
Search Deals

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 September 15, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/1512:41 pmSTS - YYZ
1 stop15h 18mMultiple Airlines
Wed 10/2210:40 amYYZ - STS
1 stop9h 14mMultiple Airlines
Deal found 9/15$357
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/297:45 amSTS - YYZ
1 stop10h 37mMultiple Airlines
Wed 11/510:00 amYYZ - STS
1 stop10h 54mMultiple Airlines
Deal found 9/13$376
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/87:00 amSTS - YYZ
1 stop11h 50mMultiple Airlines
Wed 10/1510:40 amYYZ - STS
1 stop9h 14mMultiple Airlines
Deal found 9/14$387
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/97:00 amSTS - YYZ
1 stop11h 50mMultiple Airlines
Wed 10/1510:40 amYYZ - STS
1 stop9h 14mMultiple Airlines
Deal found 9/14$389
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/77:00 amSTS - YYZ
2 stops14h 43mMultiple Airlines
Wed 10/157:45 pmYYZ - STS
1 stop30h 48mMultiple Airlines
Deal found 9/14$399
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/97:00 amSTS - YYZ
1 stop11h 50mMultiple Airlines
Mon 10/1310:40 amYYZ - STS
1 stop15h 53mMultiple Airlines
Deal found 9/13$405
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/87:00 amSTS - YYZ
1 stop11h 50mMultiple Airlines
Tue 10/146:30 amYYZ - STS
2 stops32h 31mMultiple Airlines
Deal found 9/14$413
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/97:00 amSTS - YYZ
1 stop11h 50mMultiple Airlines
Tue 10/146:30 amYYZ - STS
2 stops32h 31mMultiple Airlines
Deal found 9/14$414
This Trip.com deal was found by Cheapflights users on 9/12. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/227:00 amSTS - YUL
2 stops14h 37mMultiple Airlines
Wed 11/196:45 amYUL - STS
2 stops14h 09mMultiple Airlines
Deal found 9/12$451
This American Airlines deal was found by Cheapflights users on 9/13. 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 11/224:23 pmSTS - YUL
2 stops16h 52mAmerican Airlines
Tue 12/27:30 amYUL - STS
2 stops31h 57mAmerican Airlines
Deal found 9/13$882
This American Airlines deal was found by Cheapflights users on 9/12. 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 10/2212:31 pmSTS - YUL
1 stop23h 18mAmerican Airlines
Wed 11/192:29 pmYUL - STS
2 stops24h 37mAmerican Airlines
Deal found 9/12$893
This American Airlines deal was found by Cheapflights users on 9/13. 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 11/214:23 pmSTS - YUL
2 stops40h 52mAmerican Airlines
Tue 12/24:00 pmYUL - STS
2 stops23h 27mAmerican Airlines
Deal found 9/13$927

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 September 15, 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 10/15

9:43 am-6:12 am

2 stops17h 29m

Toronto Pearson Intl

Wed 10/22

9:45 am-6:11 pm

1 stop11h 26m

$369

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Wed 10/8

7:00 am-9:50 pm

1 stop11h 50m

Toronto Pearson Intl

Wed 10/15

10:40 am-4:54 pm

1 stop9h 14m

$387

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Thu 10/9

7:00 am-9:50 pm

1 stop11h 50m

Toronto Pearson Intl

Wed 10/15

10:40 am-4:54 pm

1 stop9h 14m

$389

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Wed 10/29

7:45 am-9:22 pm

1 stop10h 37m

Toronto Pearson Intl

Wed 11/5

1:30 pm-10:37 pm

2 stops36h 07m

$397

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Thu 10/9

7:00 am-9:50 pm

1 stop11h 50m

Toronto Pearson Intl

Mon 10/13

10:40 am-11:33 pm

1 stop15h 53m

$405

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Wed 10/8

7:00 am-9:50 pm

1 stop11h 50m

Toronto Pearson Intl

Tue 10/14

6:30 am-12:01 pm

2 stops32h 31m

$413

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Thu 10/9

7:00 am-9:50 pm

1 stop11h 50m

Toronto Pearson Intl

Tue 10/14

10:40 am-4:54 pm

1 stop9h 14m

$417

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Tue 10/7

7:00 am-9:50 pm

1 stop11h 50m

Toronto Pearson Intl

Wed 10/15

10:40 am-4:54 pm

1 stop9h 14m

$431

Santa RosaMontreal

STS - YUL

STSYUL

Santa Rosa Sonoma County

Wed 10/22

7:00 am-12:37 am

2 stops14h 37m

Montreal Pierre Elliott Trudeau Intl

Wed 11/19

6:45 am-5:54 pm

2 stops14h 09m

$451

Santa RosaMontreal

STS - YUL

STSYUL

Santa Rosa Sonoma County

Wed 10/22

12:31 pm-2:49 pm

1 stop23h 18m

Montreal Pierre Elliott Trudeau Intl

Wed 11/19

2:29 pm-12:06 pm

2 stops24h 37m

$893

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 28 results
1
2
3

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, January is the cheapest month in which you can book a flight from Santa Rosa to Region of Ontario (average of $243). Flying from Santa Rosa to Region of Ontario in August is currently the most expensive (average of $348). 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 $893, American Airlines can have you in Region of Ontario from Santa Rosa in 23h 18m. Airlines will cover a distance of 2523 mi.

  • 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 - 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, January is the cheapest month in which you can book a flight from Santa Rosa to Region of Ontario (average of $243). Flying from Santa Rosa to Region of Ontario in August is currently the most expensive (average of $348). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Santa Rosa to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Pearson Intl flights
Los Angeles to Vancouver Intl flights
San Francisco to Vancouver Intl flights
San Francisco to Pearson Intl flights
Los Angeles to Calgary flights
Los Angeles to Pierre Elliott Trudeau Intl flights
San Francisco to Abbotsford flights
San Diego to Vancouver Intl flights
Los Angeles to Abbotsford flights
Ontario to Vancouver Intl flights
Santa Ana to Vancouver Intl flights
San Francisco to Pierre Elliott Trudeau Intl flights
San Francisco to Calgary flights
San Jose to Vancouver Intl flights
Sacramento to Vancouver Intl flights
Los Angeles to Toronto Island flights
Santa Ana to Pearson Intl flights
San Francisco to Toronto Island flights
Las Vegas to Vancouver Intl flights
San Diego to Pearson Intl flights
San Francisco to Hamilton flights
Las Vegas to Pearson Intl flights
Oakland to Vancouver Intl flights
Ontario to Pearson Intl flights
Los Angeles to Hamilton flights
Palm Springs to Vancouver Intl flights
Sacramento to Pearson Intl flights
San Francisco to Region of Waterloo Intl flights
Ontario to Calgary flights
Los Angeles to Region of Waterloo Intl flights
San Jose to Pearson Intl flights
San Diego to Abbotsford flights
Palm Springs to Calgary flights
Fresno to Vancouver Intl flights
San Diego to Pierre Elliott Trudeau Intl flights
San Diego to Calgary flights
Las Vegas to Calgary flights
Los Angeles to Québec City flights
Santa Ana to Calgary flights
Las Vegas to Abbotsford flights
Fresno to Pearson Intl flights
Los Angeles to Edmonton flights
Oakland to Pearson Intl flights
Santa Ana to Hamilton flights
Burbank to Vancouver Intl flights
San Francisco to Edmonton flights
Los Angeles to Kelowna flights
San Francisco to Québec City flights
San Francisco to Halifax flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.