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Santa Rosa

$99+ 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 3/23. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — STS
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
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 December 12, 2025.

This American Airlines deal was found by Cheapflights users on 12/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/216:20 amONT - STS
1 stop6h 09mAmerican Airlines
Thu 1/14:21 pmSTS - ONT
1 stop5h 31mAmerican Airlines
Deal found 12/11$493
This American Airlines deal was found by Cheapflights users on 12/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/216:20 amONT - STS
1 stop6h 09mAmerican Airlines
Wed 12/3112:59 pmSTS - ONT
1 stop5h 29mAmerican Airlines
Deal found 12/11$503
This American Airlines deal was found by Cheapflights users on 12/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/119:59 amONT - STS
1 stop5h 57mAmerican Airlines
Thu 12/184:21 pmSTS - ONT
1 stop5h 35mAmerican Airlines
Deal found 12/10$506
This American Airlines deal was found by Cheapflights users on 12/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/216:20 amONT - STS
1 stop6h 09mAmerican Airlines
Sun 1/412:59 pmSTS - ONT
1 stop6h 08mAmerican Airlines
Deal found 12/11$533
This Alaska Airlines deal was found by Cheapflights users on 12/11. 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 12/257:00 amONT - STS
1 stop12h 10mAlaska Airlines
Thu 1/18:17 pmSTS - ONT
1 stop27h 42mAlaska Airlines
Deal found 12/11$542
This American Airlines deal was found by Cheapflights users on 12/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/2512:55 pmONT - STS
1 stop26h 56mAmerican Airlines
Wed 12/3112:59 pmSTS - ONT
1 stop5h 29mAmerican Airlines
Deal found 12/11$558
This American Airlines deal was found by Cheapflights users on 12/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/216:20 amONT - STS
1 stop6h 09mAmerican Airlines
Fri 1/24:21 pmSTS - ONT
1 stop5h 31mAmerican Airlines
Deal found 12/11$563
This American Airlines deal was found by Cheapflights users on 12/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/236:20 amONT - STS
1 stop6h 09mAmerican Airlines
Thu 1/14:21 pmSTS - ONT
1 stop5h 31mAmerican Airlines
Deal found 12/11$569
This American Airlines deal was found by Cheapflights users on 12/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/236:20 amONT - STS
1 stop6h 09mAmerican Airlines
Wed 12/3112:59 pmSTS - ONT
1 stop5h 29mAmerican Airlines
Deal found 12/11$579
This Alaska Airlines deal was found by Cheapflights users on 12/11. 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 12/257:00 amONT - STS
1 stop12h 10mAlaska Airlines
Fri 1/26:00 amSTS - ONT
1 stop28h 00mAlaska Airlines
Deal found 12/11$583
This American Airlines deal was found by Cheapflights users on 12/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/2512:55 pmONT - STS
1 stop26h 56mAmerican Airlines
Sun 1/412:59 pmSTS - ONT
1 stop6h 08mAmerican Airlines
Deal found 12/11$588
This American Airlines deal was found by Cheapflights users on 12/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/236:20 amONT - STS
1 stop6h 09mAmerican Airlines
Sun 1/412:59 pmSTS - ONT
1 stop6h 08mAmerican Airlines
Deal found 12/11$609

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 December 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$157
(Alaska Airlines)

One-way from

$99
(Alaska Airlines)

Popular in

September

Cheapest in

December

Average price

$86
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. 44% potential increase in price ($216 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 13% potential price decrease ($32 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 12, 2025.
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

Sat 5/9

1:30 pm-3:01 pm

Nonstop1h 31m

Santa Rosa Sonoma County

Wed 5/13

3:45 pm-5:12 pm

Nonstop1h 27m

$157

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 3/26

1:30 pm-3:01 pm

Nonstop1h 31m

Santa Rosa Sonoma County

Sat 3/28

3:45 pm-5:12 pm

Nonstop1h 27m

$157

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Fri 1/9

4:03 pm-11:59 pm

1 stop7h 56m

Santa Rosa Sonoma County

Fri 1/16

9:33 pm-8:36 pm

1 stop23h 03m

$204

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Mon 2/2

6:00 am-11:59 pm

1 stop17h 59m

Santa Rosa Sonoma County

Sun 2/8

9:33 pm-10:59 am

1 stop13h 26m

$204

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Fri 1/30

11:53 am-11:59 pm

1 stop12h 06m

Santa Rosa Sonoma County

Mon 2/2

9:33 pm-8:36 pm

1 stop23h 03m

$204

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 1/29

4:03 pm-11:59 pm

1 stop7h 56m

Santa Rosa Sonoma County

Sun 2/1

9:33 pm-3:08 pm

1 stop17h 35m

$204

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 1/29

4:03 pm-11:59 pm

1 stop7h 56m

Santa Rosa Sonoma County

Mon 2/2

9:33 pm-8:36 pm

1 stop23h 03m

$204

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 1/31

4:03 pm-10:35 am

1 stop18h 32m

Santa Rosa Sonoma County

Mon 2/2

9:33 pm-8:36 pm

1 stop23h 03m

$219

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Tue 2/3

4:03 pm-10:35 am

1 stop18h 32m

Santa Rosa Sonoma County

Mon 2/9

9:33 pm-8:36 pm

1 stop23h 03m

$219

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 1/24

11:53 am-10:35 am

1 stop22h 42m

Santa Rosa Sonoma County

Sun 1/25

9:33 pm-11:56 pm

1 stop26h 23m

$219

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Ontario-Santa Rosa flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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 $18). 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 December 12, 2025.

It’s optimal to fly from Ontario to Santa Rosa in the morning. By choosing this option you can save up to 60% on the cost of your flight, compared to a flight at noon.

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 December 12, 2025.
Read through reviews of airlines operating flights from Ontario to Santa Rosa, such as Alaska Airlines, Avelo 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
11,432 reviews

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Food

7.1

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
11,432 reviews
Alaska Airlines
8.0
Very good
11,432 reviews

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Food

7.1

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Avelo Airlines
7.5
Good
Alaska Airlines
8.0
Very good
11,432 reviews

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Food

7.1

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
American Airlines
7.2
Good
11,049 reviews
Alaska Airlines
8.0
Very good
11,432 reviews

Boarding

8.1

Overall

8.0

Comfort

7.8

Crew

8.5

Food

7.1

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

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 1h 31m. 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 $72. Other airlines that can offer you cheap pricing are Alaska Airlines, from $117, and American Airlines, from $222. Avelo Airlines is currently priced 72% below the average price you’ll pay for this route.

  • 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 $18). 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 3 airlines flying from Ontario to Santa Rosa

Discover the top 3 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 December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Avelo AirlinesCheapest$72Average$93FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$117Average$332FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$222Average$346FlexibilityNo cancel feeOn-time71%

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