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$214+ 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 4/28. Fares are subject to change and may not be available on all flights or dates of travel.
STS — YYZ
Apr 18 — Apr 251
Sat 4/18
Sat 4/25
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 March 19, 2026.

This Alaska Airlines deal was found by Cheapflights users on 3/14. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/307:00 am
STS
-
YYZ
2 stops29h 45m
Alaska Airlines
Tue 5/54:55 pm
YYZ
-
STS
2 stops29h 11m
Alaska Airlines
Deal found 3/14$479
This flugladen.de deal was found by Cheapflights users on 3/15. 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/297:00 am
STS
-
YYZ
1 stop11h 22m
Multiple Airlines
Wed 5/69:40 am
YYZ
-
STS
1 stop17h 19m
Multiple Airlines
Deal found 3/15$487
This Billigflug deal was found by Cheapflights users on 3/15. 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 Billigflug is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/297:23 am
STS
-
YYZ
2 stops29h 22m
Alaska Airlines
Wed 5/64:55 pm
YYZ
-
STS
2 stops33h 32m
Alaska Airlines
Deal found 3/15$494
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.
Thu 4/307:00 am
STS
-
YYZ
2 stops29h 45m
Alaska Airlines
Thu 5/74:55 pm
YYZ
-
STS
2 stops33h 32m
Alaska Airlines
Deal found 3/16$500
This Alaska Airlines deal was found by Cheapflights users on 3/14. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/307:00 am
STS
-
YYZ
2 stops29h 45m
Alaska Airlines
Mon 5/44:55 pm
YYZ
-
STS
1 stop9h 02m
Alaska Airlines
Deal found 3/14$536
This Alaska Airlines deal was found by Cheapflights users on 3/14. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/291:13 pm
STS
-
YYZ
1 stop23h 32m
Alaska Airlines
Mon 5/44:55 pm
YYZ
-
STS
1 stop9h 02m
Alaska Airlines
Deal found 3/14$537
This Alaska Airlines deal was found by Cheapflights users on 3/14. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/307:00 am
STS
-
YYZ
2 stops29h 45m
Alaska Airlines
Wed 5/64:55 pm
YYZ
-
STS
2 stops33h 06m
Alaska Airlines
Deal found 3/14$543
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.
Thu 6/254:20 pm
STS
-
YUL
2 stops16h 24m
American Airlines
Sat 7/45:31 pm
YUL
-
STS
2 stops21h 32m
American Airlines
Deal found 3/18$810
This American Airlines deal was found by Cheapflights users on 3/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/3012:56 pm
STS
-
YUL
2 stops19h 48m
American Airlines
Thu 5/77:29 am
YUL
-
STS
2 stops11h 24m
American Airlines
Deal found 3/15$825
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 6/812:45 pm
STS
-
YUL
2 stops25h 08m
American Airlines
Fri 6/123:48 pm
YUL
-
STS
1 stop23h 17m
American Airlines
Deal found 3/16$852
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.
Tue 9/1512:35 pm
STS
-
YUL
1 stop23h 09m
American Airlines
Wed 9/166:00 pm
YUL
-
STS
2 stops21h 25m
American Airlines
Deal found 3/19$853
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.
Tue 9/1512:35 pm
STS
-
YUL
1 stop23h 09m
American Airlines
Thu 9/173:45 pm
YUL
-
STS
1 stop23h 27m
American Airlines
Deal found 3/19$874

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 March 19, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$479
(Alaska Airlines)

One-way from

$214
(Alaska Airlines)

Popular in

December

Cheapest in

January

Average price

$456
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. 8% potential increase in price ($42 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($17 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 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 March 19, 2026.
Use the filters below to find and compare flights from Santa Rosa to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Fri 5/1

1:13 pm-3:45 pm

1 stop23h 32m

Toronto Pearson Intl

Tue 5/5

4:55 pm-7:06 pm

2 stops29h 11m

$494

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Wed 4/29

7:23 am-3:45 pm

2 stops29h 22m

Toronto Pearson Intl

Wed 5/6

4:55 pm-11:27 pm

2 stops33h 32m

$494

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Wed 4/29

7:00 am-12:09 am

1 stop14h 09m

Toronto Pearson Intl

Wed 5/6

6:15 am-11:59 pm

2 stops20h 44m

$495

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Wed 4/29

1:13 pm-3:45 pm

1 stop23h 32m

Toronto Pearson Intl

Sun 5/3

4:55 pm-10:57 pm

1 stop9h 02m

$537

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Wed 4/29

1:13 pm-3:45 pm

1 stop23h 32m

Toronto Pearson Intl

Mon 5/4

4:55 pm-10:57 pm

1 stop9h 02m

$537

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Fri 5/1

7:46 pm-3:45 pm

1 stop16h 59m

Toronto Pearson Intl

Wed 5/6

4:55 pm-11:01 pm

2 stops33h 06m

$558

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Thu 4/30

7:46 pm-3:45 pm

1 stop16h 59m

Toronto Pearson Intl

Wed 5/6

4:55 pm-12:21 pm

1 stop22h 26m

$568

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Thu 4/30

7:00 am-3:45 pm

2 stops29h 45m

Toronto Pearson Intl

Thu 5/7

4:55 pm-11:27 pm

2 stops33h 32m

$571

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Fri 4/17

6:53 pm-3:45 pm

1 stop17h 52m

Toronto Pearson Intl

Tue 4/21

4:55 pm-12:21 pm

1 stop22h 26m

$628

Santa RosaToronto

STS - YYZ

STSYYZ

Santa Rosa Sonoma County

Mon 4/6

7:02 pm-3:45 pm

2 stops17h 43m

Toronto Pearson Intl

Wed 4/8

4:55 pm-10:30 am

1 stop20h 35m

$628

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/14

Showing 1-10 of 23 resultsSorted by cheapest first
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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 $126). 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 $810, Alaska Airlines can have you in Region of Ontario from Santa Rosa in 16h 24m. Airlines will cover a distance of 2523 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 Region of Waterloo 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, February is the cheapest month in which you can book a flight from Santa Rosa to Region of Ontario (average of $126). 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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