HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
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 3/25. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — STS
Mar 13 — Mar 201
Fri 3/13
Fri 3/20
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Santa Rosa 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 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 February 11, 2026.

This CheapOair deal was found by Cheapflights users on 2/7. 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 3/194:22 pm
ONT
-
STS
Nonstop2h 00m
Alaska Airlines
Mon 3/232:12 pm
STS
-
ONT
Nonstop1h 30m
Alaska Airlines
Deal found 2/7$117
This Alaska Airlines deal was found by Cheapflights users on 2/9. 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 2/9$127
This Alaska Airlines deal was found by Cheapflights users on 2/7. 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 4/174:22 pm
ONT
-
STS
Nonstop2h 00m
Alaska Airlines
Mon 4/202:12 pm
STS
-
ONT
Nonstop1h 30m
Alaska Airlines
Deal found 2/7$137
This CheapOair deal was found by Cheapflights users on 2/9. 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.
Fri 4/34:22 pm
ONT
-
STS
Nonstop2h 00m
Alaska Airlines
Sun 4/52:18 pm
STS
-
ONT
Nonstop1h 30m
Alaska Airlines
Deal found 2/9$147
This Alaska Airlines deal was found by Cheapflights users on 2/9. 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
Tue 5/265:06 pm
STS
-
ONT
Nonstop1h 24m
Alaska Airlines
Deal found 2/9$157
This Alaska Airlines deal was found by Cheapflights users on 2/8. 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 3/264:22 pm
ONT
-
STS
Nonstop2h 00m
Alaska Airlines
Mon 3/302:12 pm
STS
-
ONT
Nonstop1h 30m
Alaska Airlines
Deal found 2/8$167
This Alaska Airlines deal was found by Cheapflights users on 2/11. 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 4/3012:48 pm
ONT
-
STS
Nonstop1h 32m
Alaska Airlines
Mon 5/410:41 am
STS
-
ONT
Nonstop1h 27m
Alaska Airlines
Deal found 2/11$187
This Alaska Airlines deal was found by Cheapflights users on 2/9. 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
Mon 5/255:06 pm
STS
-
ONT
Nonstop1h 24m
Alaska Airlines
Deal found 2/9$197
This Alaska Airlines deal was found by Cheapflights users on 2/9. 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 3/204:22 pm
ONT
-
STS
Nonstop2h 00m
Alaska Airlines
Sun 3/222:18 pm
STS
-
ONT
Nonstop1h 30m
Alaska Airlines
Deal found 2/9$207
This Trip.com deal was found by Cheapflights users on 2/10. 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 11/251:30 pm
ONT
-
STS
Nonstop1h 31m
Alaska Airlines
Tue 12/13:45 pm
STS
-
ONT
Nonstop1h 27m
Alaska Airlines
Deal found 2/10$212
This Alaska Airlines deal was found by Cheapflights users on 2/9. 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 5/182:58 pm
ONT
-
STS
Nonstop1h 28m
Alaska Airlines
Thu 5/285:06 pm
STS
-
ONT
Nonstop1h 24m
Alaska Airlines
Deal found 2/9$217

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 February 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$117
(CheapOair)

One-way from

$79
(Alaska Airlines)

Popular in

September

Cheapest in

November

Average price

$188

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. 36% potential increase in price ($174 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 10% potential price decrease ($30 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 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 February 11, 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

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

$117

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 5/9

12:48 pm-2:20 pm

Nonstop1h 32m

Santa Rosa Sonoma County

Tue 5/12

10:41 am-12:08 pm

Nonstop1h 27m

$117

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 5/7

12:48 pm-2:20 pm

Nonstop1h 32m

Santa Rosa Sonoma County

Tue 5/12

10:41 am-12:08 pm

Nonstop1h 27m

$117

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Wed 5/6

12:48 pm-2:20 pm

Nonstop1h 32m

Santa Rosa Sonoma County

Tue 5/12

10:41 am-12:08 pm

Nonstop1h 27m

$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

Fri 4/17

4:22 pm-6:22 pm

Nonstop2h 00m

Santa Rosa Sonoma County

Mon 4/20

2:12 pm-3:42 pm

Nonstop1h 30m

$137

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Wed 5/20

2:58 pm-4:26 pm

Nonstop1h 28m

Santa Rosa Sonoma County

Tue 5/26

5:06 pm-6:30 pm

Nonstop1h 24m

$137

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Tue 5/19

2:58 pm-4:26 pm

Nonstop1h 28m

Santa Rosa Sonoma County

Tue 5/26

5:06 pm-6:30 pm

Nonstop1h 24m

$137

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Fri 4/3

4:22 pm-6:22 pm

Nonstop2h 00m

Santa Rosa Sonoma County

Sun 4/5

2:18 pm-3:48 pm

Nonstop1h 30m

$147

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 5/21

2:58 pm-4:26 pm

Nonstop1h 28m

Santa Rosa Sonoma County

Sat 5/23

5:06 pm-6:30 pm

Nonstop1h 24m

$157

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/8

Showing 1-10 of 22 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 February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust 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 FlightHub the most. FlightHub 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, May is the cheapest month in which you can book a flight from Ontario to Santa Rosa (average of $28). Flying from Ontario to Santa Rosa in October is currently the most expensive (average of $58). 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 February 11, 2026.

It’s optimal to fly from Ontario to Santa Rosa in the evening. By choosing this option you can save up to 65% 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 February 11, 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
11,874 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

robert,Feb 2026

LAS - SAN

The good customer service team made you fell welcome on the flight.
Alaska Airlines
8.0
Very good
11,874 reviews
Alaska Airlines
8.0
Very good
11,874 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

robert,Feb 2026

LAS - SAN

The good customer service team made you fell welcome on the flight.
American Airlines
7.2
Good
11,266 reviews
Alaska Airlines
8.0
Very good
11,874 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Entertainment

7.0

Comfort

7.8

Crew

8.5

Reviews

1 / 20
10.0
Excellent

robert,Feb 2026

LAS - SAN

The good customer service team made you fell welcome on the flight.

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 62% 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 $137. 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, May is the cheapest month in which you can book a flight from Ontario to Santa Rosa (average of $28). Flying from Ontario to Santa Rosa in October is currently the most expensive (average of $58). 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

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 Ontario to Santa Rosa

See prices for flight routes from nearby airports that may be better suited for you.
San Francisco to Las Vegas flights
San Francisco to Los Angeles flights
Los Angeles to San Francisco flights
San Jose to Los Angeles flights
Los Angeles to Las Vegas flights
San Francisco to Ontario flights
San Francisco to Santa Ana flights
Burbank to Las Vegas flights
San Francisco to Burbank flights
Los Angeles to San Jose flights
Santa Ana to Las Vegas flights
Ontario to San Francisco flights
San Francisco to San Diego flights
San Jose to Las Vegas flights
Santa Ana to San Francisco flights
Sacramento to Las Vegas flights
Burbank to San Francisco flights
San Francisco to Palm Springs flights
San Diego to Las Vegas flights
Oakland to Las Vegas flights
San Diego to San Francisco flights
Sacramento to Los Angeles flights
Ontario to Las Vegas flights
Los Angeles to Sacramento flights
San Jose to San Diego flights
San Jose to Ontario flights
Ontario to San Jose flights
Los Angeles to Reno flights
Santa Ana to San Jose flights
San Jose to Santa Ana flights
Las Vegas to Los Angeles flights
Sacramento to Ontario flights
Fresno to Las Vegas flights
Burbank to San Jose flights
Sacramento to San Diego flights
Stockton to Las Vegas flights
Las Vegas to San Francisco flights
Long Beach to San Francisco flights
San Diego to San Jose flights
Oakland to San Diego flights
San Jose to Burbank flights
San Francisco to Long Beach flights
Las Vegas to Burbank flights
Ontario to Sacramento flights
Oakland to Los Angeles flights
Burbank to Reno flights
San Diego to Sacramento flights
Las Vegas to Santa Ana flights
Reno to Los Angeles flights
Reno to Las Vegas flights

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 February 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$117Average$267FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$222Average$366FlexibilityNo cancel feeOn-time71%

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.