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Santa Rosa

$79+ Cheap flights from Ontario to Santa Rosa (ONT - 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.
ONT — STS
Feb 20 — Feb 271
Fri 2/20
Fri 2/27
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 21, 2026.

This Alaska Airlines deal was found by Cheapflights users on 1/19. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/184:22 pm
ONT
-
STS
Nonstop2h 00m
Alaska Airlines
Sat 3/282:12 pm
STS
-
ONT
Nonstop1h 30m
Alaska Airlines
Deal found 1/19$117
This Alaska Airlines deal was found by Cheapflights users on 1/20. 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 3/194:22 pm
ONT
-
STS
Nonstop2h 00m
Alaska Airlines
Sun 3/222:18 pm
STS
-
ONT
Nonstop1h 30m
Alaska Airlines
Deal found 1/20$127
This Alaska Airlines deal was found by Cheapflights users on 1/21. 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 5/192:58 pm
ONT
-
STS
Nonstop1h 28m
Alaska Airlines
Thu 5/285:06 pm
STS
-
ONT
Nonstop1h 24m
Alaska Airlines
Deal found 1/21$137
This CheapOair deal was found by Cheapflights users on 1/21. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/254:22 pm
ONT
-
STS
Nonstop2h 00m
Alaska Airlines
Sat 3/282:12 pm
STS
-
ONT
Nonstop1h 30m
Alaska Airlines
Deal found 1/21$139
This Alaska Airlines deal was found by Cheapflights users on 1/21. 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 5/212:58 pm
ONT
-
STS
Nonstop1h 28m
Alaska Airlines
Sat 5/235:06 pm
STS
-
ONT
Nonstop1h 24m
Alaska Airlines
Deal found 1/21$157
This Alaska Airlines deal was found by Cheapflights users on 1/20. 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 4/2412:48 pm
ONT
-
STS
Nonstop1h 32m
Alaska Airlines
Mon 4/2710:41 am
STS
-
ONT
Nonstop1h 27m
Alaska Airlines
Deal found 1/20$167
This Alaska Airlines deal was found by Cheapflights users on 1/20. 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.
Sat 3/74:02 pm
ONT
-
STS
1 stop5h 50m
Alaska Airlines
Wed 3/182:12 pm
STS
-
ONT
Nonstop1h 30m
Alaska Airlines
Deal found 1/20$181
This Alaska Airlines deal was found by Cheapflights users on 1/21. 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 5/222:58 pm
ONT
-
STS
Nonstop1h 28m
Alaska Airlines
Wed 5/275:06 pm
STS
-
ONT
Nonstop1h 24m
Alaska Airlines
Deal found 1/21$187
This CheapOair deal was found by Cheapflights users on 1/21. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/264:22 pm
ONT
-
STS
Nonstop2h 00m
Alaska Airlines
Sun 3/292:18 pm
STS
-
ONT
Nonstop1h 30m
Alaska Airlines
Deal found 1/21$189
This Alaska Airlines deal was found by Cheapflights users on 1/20. 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 5/152:58 pm
ONT
-
STS
Nonstop1h 28m
Alaska Airlines
Sat 5/165:06 pm
STS
-
ONT
Nonstop1h 24m
Alaska Airlines
Deal found 1/20$197
This CheapOair deal was found by Cheapflights users on 1/21. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/262:58 pm
ONT
-
STS
Nonstop1h 28m
Alaska Airlines
Thu 5/285:06 pm
STS
-
ONT
Nonstop1h 24m
Alaska Airlines
Deal found 1/21$199

Find flight deals from Ontario to Santa Rosa

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Santa Rosa (STS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$117
(Alaska Airlines)

One-way from

$79
(Alaska Airlines)

Popular in

September

Cheapest in

February

Average price

$277

Good round-trip deal

$157 or less
Provider with most accurate pricing for Ontario-Santa Rosa Sonoma County flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Santa Rosa Sonoma County 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. 40% potential increase in price ($193 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 10% potential price decrease ($29 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip flight from Ontario to Santa Rosa Sonoma County.
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 21, 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

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 4/16

4:22 pm-6:22 pm

Nonstop2h 00m

Santa Rosa Sonoma County

Sat 4/18

2:12 pm-3:42 pm

Nonstop1h 30m

$117

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 4/4

4:22 pm-6:22 pm

Nonstop2h 00m

Santa Rosa Sonoma County

Sat 4/11

2:12 pm-3:42 pm

Nonstop1h 30m

$117

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Wed 3/18

4:22 pm-6:22 pm

Nonstop2h 00m

Santa Rosa Sonoma County

Sat 3/28

2:12 pm-3:42 pm

Nonstop1h 30m

$117

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 3/19

4:22 pm-6:22 pm

Nonstop2h 00m

Santa Rosa Sonoma County

Sun 3/22

2:18 pm-3:48 pm

Nonstop1h 30m

$127

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Wed 4/8

4:22 pm-6:22 pm

Nonstop2h 00m

Santa Rosa Sonoma County

Sat 4/11

2:12 pm-3:42 pm

Nonstop1h 30m

$137

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Fri 4/17

4:22 pm-6:22 pm

Nonstop2h 00m

Santa Rosa Sonoma County

Sun 4/19

2:18 pm-3:48 pm

Nonstop1h 30m

$157

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 3/7

4:02 pm-9:52 pm

1 stop5h 50m

Santa Rosa Sonoma County

Wed 3/18

2:12 pm-3:42 pm

Nonstop1h 30m

$181

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Fri 3/27

4:22 pm-6:22 pm

Nonstop2h 00m

Santa Rosa Sonoma County

Mon 4/6

2:12 pm-3:42 pm

Nonstop1h 30m

$197

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sun 3/29

4:28 pm-6:28 pm

Nonstop2h 00m

Santa Rosa Sonoma County

Mon 4/6

2:12 pm-3:42 pm

Nonstop1h 30m

$197

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sun 3/22

4:28 pm-6:28 pm

Nonstop2h 00m

Santa Rosa Sonoma County

Mon 3/23

2:12 pm-3:42 pm

Nonstop1h 30m

$207

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/21

Showing 1-10 of 23 results
1
2
3

Compare providers for flights from Ontario to Santa Rosa

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Santa Rosa in January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
PricelinePrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ontario-Santa Rosa flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Santa Rosa flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Santa Rosa flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Santa Rosa flights, Cheapflights users trust Expedia the most. Expedia has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Santa Rosa flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 Ontario to Santa Rosa?

Currently, February is the cheapest month in which you can book a flight from Ontario to Santa Rosa (average of $19). Flying from Ontario to Santa Rosa in July is currently the most expensive (average of $57). 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.

What is the cheapest time of day to fly from ONT to STS?

Find hourly flight availability from Ontario to Santa Rosa. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 21, 2026.

It’s optimal to fly from Ontario to Santa Rosa in the evening. By choosing this option you can save up to 68% on the cost of your flight, compared to a flight in the afternoon.

Reviews of airlines servicing Santa Rosa

Get insights into the airlines that provide service to Santa Rosa. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Santa Rosa. Reviews last updated January 21, 2026.
Read through reviews of airlines operating flights from Ontario to Santa Rosa, such as Alaska Airlines and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,775 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.0

Comfort

7.8

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
Alaska Airlines
8.0
Very good
11,775 reviews
Alaska Airlines
8.0
Very good
11,775 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.0

Comfort

7.8

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading
American Airlines
7.2
Good
11,173 reviews
Alaska Airlines
8.0
Very good
11,775 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.0

Comfort

7.8

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2026

STS - LAX

Enjoyed staff assistance from ticking thru tsa , boarding and in the plane Couldn’t pick a seat except upgrading

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.

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

    Departing from Ontario to Santa Rosa will take you 2h. Ontario and Santa Rosa are separated by a distance of 423 mi. Most flights are nonstop.

  • What are the cheapest airlines flying from Ontario to Santa Rosa round-trip?

    Cheapflights users have booked flights from Ontario to Santa Rosa round-trip from $117. Another airline that can offer you cheap pricing is American Airlines. Alaska Airlines is currently priced 59% below the average price you’ll pay for this route.

  • What are the cheapest flights from Ontario to Santa Rosa?

    Looking at all options, your cheapest flight can be booked for $157. While the most popular route (Ontario - Santa Rosa Sonoma County) can be booked for $117 on average, our data indicates $247 when flying from Ontario to Santa Rosa.

  • 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 Ontario to Santa Rosa?

    Currently, February is the cheapest month in which you can book a flight from Ontario to Santa Rosa (average of $19). Flying from Ontario to Santa Rosa in July is currently the most expensive (average of $57). 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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Top 2 airlines flying from Ontario to Santa Rosa

Discover the top 2 airlines that operate flights from Ontario to Santa Rosa. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$117Average$297FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$222Average$366FlexibilityNo cancel feeOn-time71%

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