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Santa Rosa

$139+ 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 12/15. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — STS
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Cheap 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 October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$137
(Alaska Airlines)

Popular in

September

Cheapest in

December

Average price

$536
Provider with most accurate pricing for Ontario-Santa Rosa Sonoma County flight deals.
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Provider most trusted by Cheapflights users for Ontario-Santa Rosa Sonoma County flights.
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From Ontario to Santa Rosa Sonoma County
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Highest demand for flights based on searches. 43% potential increase in price ($211 potential increase over avg. RT price).
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Cheapest flight prices on average. 12% potential price decrease ($30 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find 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 October 30, 2025.

This American Airlines deal was found by Cheapflights users on 10/29. 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 11/136:11 amONT - STS
1 stop6h 37mAmerican Airlines
Mon 11/1712:37 pmSTS - ONT
1 stop5h 43mAmerican Airlines
Deal found 10/29$297
This Cheapflightsfares deal was found by Cheapflights users on 10/29. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/61:26 pmONT - STS
1 stop5h 49mAlaska Airlines
Mon 12/87:50 amSTS - ONT
1 stop4h 56mAlaska Airlines
Deal found 10/29$309
This American Airlines deal was found by Cheapflights users on 10/29. 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 12/89:59 amONT - STS
1 stop5h 57mAmerican Airlines
Wed 12/1012:57 pmSTS - ONT
1 stop5h 22mAmerican Airlines
Deal found 10/29$317
This Alaska Airlines deal was found by Cheapflights users on 10/29. 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 12/41:26 pmONT - STS
2 stops8h 26mAlaska Airlines
Mon 12/86:54 pmSTS - ONT
1 stop17h 52mAlaska Airlines
Deal found 10/29$342
This American Airlines deal was found by Cheapflights users on 10/30. 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 12/49:59 amONT - STS
1 stop5h 57mAmerican Airlines
Sun 12/712:57 pmSTS - ONT
1 stop5h 22mAmerican Airlines
Deal found 10/30$358
This Alaska Airlines deal was found by Cheapflights users on 10/29. 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 12/86:00 amONT - STS
2 stops26h 48mAlaska Airlines
Wed 12/107:50 amSTS - ONT
2 stops10h 43mAlaska Airlines
Deal found 10/29$363
This Alaska Airlines deal was found by Cheapflights users on 10/30. 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 12/244:36 pmONT - STS
1 stop20h 56mAlaska Airlines
Mon 12/298:17 pmSTS - ONT
1 stop20h 54mAlaska Airlines
Deal found 10/30$372
This Alaska Airlines deal was found by Cheapflights users on 10/30. 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 12/256:00 amONT - STS
1 stop7h 32mAlaska Airlines
Mon 12/298:17 pmSTS - ONT
1 stop27h 42mAlaska Airlines
Deal found 10/30$382
This Alaska Airlines deal was found by Cheapflights users on 10/28. 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.
Sun 12/147:10 amONT - STS
1 stop25h 38mAlaska Airlines
Thu 12/1812:03 pmSTS - ONT
1 stop11h 56mAlaska Airlines
Deal found 10/28$402

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 October 30, 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

Mon 12/8

9:59 am-3:56 pm

1 stop5h 57m

Santa Rosa Sonoma County

Wed 12/10

12:57 pm-6:19 pm

1 stop5h 22m

$317

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Fri 12/5

1:26 pm-8:48 am

1 stop19h 22m

Santa Rosa Sonoma County

Sun 12/7

7:50 am-8:03 pm

1 stop12h 13m

$322

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Tue 11/18

6:03 pm-8:44 am

1 stop14h 41m

Santa Rosa Sonoma County

Fri 11/21

8:15 pm-11:59 pm

1 stop27h 44m

$332

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 1/24

11:53 am-8:58 am

2 stops21h 05m

Santa Rosa Sonoma County

Tue 1/27

11:15 am-1:06 pm

2 stops25h 51m

$353

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 12/4

9:59 am-3:56 pm

1 stop5h 57m

Santa Rosa Sonoma County

Sun 12/7

12:57 pm-6:19 pm

1 stop5h 22m

$358

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Wed 12/24

4:36 pm-1:32 pm

1 stop20h 56m

Santa Rosa Sonoma County

Mon 12/29

8:17 pm-5:11 pm

1 stop20h 54m

$372

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 12/25

6:00 am-1:32 pm

1 stop7h 32m

Santa Rosa Sonoma County

Mon 12/29

8:17 pm-11:59 pm

1 stop27h 42m

$382

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 12/4

1:26 pm-7:15 pm

1 stop5h 49m

Santa Rosa Sonoma County

Sat 12/6

7:50 am-12:46 pm

1 stop4h 56m

$392

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sun 12/14

7:10 am-1:29 pm

2 stops30h 19m

Santa Rosa Sonoma County

Thu 12/18

7:00 am-11:59 pm

2 stops16h 59m

$423

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Mon 12/15

9:59 am-3:56 pm

1 stop5h 57m

$139

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

Showing 1-10 of 19 results
1
2

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 October.
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, December is the cheapest month in which you can book a flight from Ontario to Santa Rosa (average of $17). 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 October 30, 2025.

It’s optimal to fly from Ontario to Santa Rosa at noon. By choosing this option you can save up to 74% 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 October 30, 2025.
Read through reviews of airlines operating flights from Ontario to Santa Rosa, such as Avelo Airlines and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Avelo Airlines
7.5
Good

Comfort

7.1

Food

5.0

Entertainment

5.0

Boarding

7.7

Overall

7.5

Crew

8.2

Reviews

1 / 6
2.0
Mediocre

Cindy,Sep 2023

MCO - DAY

I was emailed and told that if I check my luggage early I get a 10 dollar discount, also on the website, if it's under 50 lbs. it would be $40.00 I was charged $65.00 on first flight and $60.00 on second flight (second flight I checked in early, did not receive the discount, both flights my luggage was under 40 lbs.). Avelo destroyed my luggage, wheels were tore off, and plastic was ripped off.
Avelo Airlines
7.5
Good
Avelo Airlines
7.5
Good

Comfort

7.1

Food

5.0

Entertainment

5.0

Boarding

7.7

Overall

7.5

Crew

8.2

Reviews

1 / 6
2.0
Mediocre

Cindy,Sep 2023

MCO - DAY

I was emailed and told that if I check my luggage early I get a 10 dollar discount, also on the website, if it's under 50 lbs. it would be $40.00 I was charged $65.00 on first flight and $60.00 on second flight (second flight I checked in early, did not receive the discount, both flights my luggage was under 40 lbs.). Avelo destroyed my luggage, wheels were tore off, and plastic was ripped off.
American Airlines
7.2
Good
11,034 reviews
Avelo Airlines
7.5
Good

Comfort

7.1

Food

5.0

Entertainment

5.0

Boarding

7.7

Overall

7.5

Crew

8.2

Reviews

1 / 6
2.0
Mediocre

Cindy,Sep 2023

MCO - DAY

I was emailed and told that if I check my luggage early I get a 10 dollar discount, also on the website, if it's under 50 lbs. it would be $40.00 I was charged $65.00 on first flight and $60.00 on second flight (second flight I checked in early, did not receive the discount, both flights my luggage was under 40 lbs.). Avelo destroyed my luggage, wheels were tore off, and plastic was ripped off.

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 5h 57m. Ontario and Santa Rosa are separated by a distance of 423 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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 $67. Another airline that can offer you cheap pricing is American Airlines. Avelo Airlines is currently priced 75% 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, December is the cheapest month in which you can book a flight from Ontario to Santa Rosa (average of $17). 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Avelo AirlinesCheapest$67Average$86FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$222Average$307FlexibilityNo cancel feeOn-time71%

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