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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 10/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — STS
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
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 September 17, 2025.

Round-trip from

$257
(American Airlines)

One-way from

$139
(American Airlines)

Popular in

October

Cheapest in

December

Average price

$369
From Ontario to Santa Rosa Sonoma County
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One-way flight from Ontario to Santa Rosa Sonoma County
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Highest demand for flights based on searches. 34% potential increase in price ($134 potential increase over avg. RT price).
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Cheapest flight prices on average. 13% potential price decrease ($31 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 17, 2025.

This American Airlines deal was found by Cheapflights users on 9/15. 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.
Wed 10/16:10 amONT - STS
1 stop6h 19mAmerican Airlines
Mon 10/612:53 pmSTS - ONT
1 stop6h 06mAmerican Airlines
Deal found 9/15$257
This American Airlines deal was found by Cheapflights users on 9/16. 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.
Sat 10/46:10 amONT - STS
1 stop6h 19mAmerican Airlines
Mon 10/612:53 pmSTS - ONT
1 stop6h 06mAmerican Airlines
Deal found 9/16$277
This American Airlines deal was found by Cheapflights users on 9/16. 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.
Thu 10/2310:09 amONT - STS
1 stop5h 38mAmerican Airlines
Mon 10/274:17 pmSTS - ONT
1 stop5h 32mAmerican Airlines
Deal found 9/16$278
This Cheapflightsfares deal was found by Cheapflights users on 9/17. 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 11/84:11 pmONT - STS
1 stop5h 54mAlaska Airlines
Tue 11/112:22 pmSTS - ONT
1 stop6h 31mAlaska Airlines
Deal found 9/17$291
This American Airlines deal was found by Cheapflights users on 9/17. 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 10/216:15 amONT - STS
1 stop6h 06mAmerican Airlines
Thu 10/234:17 pmSTS - ONT
1 stop5h 32mAmerican Airlines
Deal found 9/17$297
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/256:00 amONT - STS
1 stop7h 36mAlaska Airlines
Sat 11/12:22 pmSTS - ONT
1 stop6h 31mAlaska Airlines
Deal found 9/15$302
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/276:11 pmONT - STS
1 stop19h 15mAlaska Airlines
Sat 11/12:22 pmSTS - ONT
1 stop6h 31mAlaska Airlines
Deal found 9/15$312
This lastminute.com deal was found by Cheapflights users on 9/16. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/111:31 pmONT - STS
1 stop8h 35mHawaiian Airlines
Sat 10/182:30 pmSTS - ONT
1 stop9h 33mHawaiian Airlines
Deal found 9/16$313
This American Airlines deal was found by Cheapflights users on 9/17. 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.
Sat 10/46:10 amONT - STS
1 stop6h 19mAmerican Airlines
Sat 1/1012:45 pmSTS - ONT
1 stop5h 08mAmerican Airlines
Deal found 9/17$317
This Alaska Airlines deal was found by Cheapflights users on 9/16. 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.
Sat 10/256:00 amONT - STS
1 stop7h 36mAlaska Airlines
Fri 10/312:22 pmSTS - ONT
1 stop20h 43mAlaska Airlines
Deal found 9/16$322
This Alaska Airlines deal was found by Cheapflights users on 9/14. 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.
Tue 10/216:00 amONT - STS
1 stop7h 36mAlaska Airlines
Fri 10/246:51 pmSTS - ONT
1 stop18h 10mAlaska Airlines
Deal found 9/14$332
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/156:00 amONT - STS
1 stop7h 36mAlaska Airlines
Fri 10/172:30 pmSTS - ONT
1 stop22h 07mAlaska Airlines
Deal found 9/15$342

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 September 17, 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 10/25

6:00 am-1:36 pm

1 stop7h 36m

Santa Rosa Sonoma County

Sat 11/1

2:22 pm-8:53 pm

1 stop6h 31m

$302

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 11/8

6:00 am-1:26 pm

1 stop7h 26m

Santa Rosa Sonoma County

Tue 11/11

2:22 pm-8:53 pm

1 stop6h 31m

$302

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 10/25

6:00 am-1:36 pm

1 stop7h 36m

Santa Rosa Sonoma County

Tue 10/28

2:22 pm-11:05 am

1 stop20h 43m

$302

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Mon 10/27

6:11 pm-1:26 pm

1 stop19h 15m

Santa Rosa Sonoma County

Sat 11/1

2:22 pm-8:53 pm

1 stop6h 31m

$312

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Tue 10/14

7:10 am-7:13 pm

1 stop12h 03m

Santa Rosa Sonoma County

Tue 10/21

7:05 am-6:33 pm

1 stop11h 28m

$312

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 10/11

1:31 pm-10:06 pm

1 stop8h 35m

Santa Rosa Sonoma County

Sat 10/18

2:30 pm-12:03 am

1 stop9h 33m

$313

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 10/4

6:10 am-12:29 pm

1 stop6h 19m

Santa Rosa Sonoma County

Sat 1/10

12:45 pm-5:53 pm

1 stop5h 08m

$317

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 10/25

6:00 am-1:36 pm

1 stop7h 36m

Santa Rosa Sonoma County

Fri 10/31

2:22 pm-11:05 am

1 stop20h 43m

$322

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Tue 10/21

6:00 am-1:36 pm

1 stop7h 36m

Santa Rosa Sonoma County

Fri 10/24

6:51 pm-1:01 pm

1 stop18h 10m

$332

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Fri 10/10

7:43 pm-10:06 pm

1 stop26h 23m

$167

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 16 results
1
2

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 $202). Flying from Ontario to Santa Rosa in June is currently the most expensive (average of $395). 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 September 17, 2025.

It’s optimal to fly from Ontario to Santa Rosa in the morning. By choosing this option you can save up to 62% 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 September 17, 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

Boarding

7.6

Comfort

7.1

Crew

8.2

Entertainment

5.0

Food

5.1

Overall

7.5

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

Boarding

7.6

Comfort

7.1

Crew

8.2

Entertainment

5.0

Food

5.1

Overall

7.5

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
10,000 reviews
Avelo Airlines
7.5
Good

Boarding

7.6

Comfort

7.1

Crew

8.2

Entertainment

5.0

Food

5.1

Overall

7.5

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 7h 36m. Ontario and Santa Rosa are separated by a distance of 423 mi.

  • 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 73% 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 $202). Flying from Ontario to Santa Rosa in June is currently the most expensive (average of $395). 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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
Avelo AirlinesCheapest$67Average$85FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$222Average$306FlexibilityNo cancel feeOn-time71%

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