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Santa Rosa

$177+ 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 9/26. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — STS
Aug 23 — Aug 301
Sat 8/23
Sat 8/30
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 August 18, 2025.

Round-trip from

$237
(American Airlines)

One-way from

$177
(Alaska Airlines)

Popular in

October

Cheapest in

December

Average price

$96
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. 39% potential increase in price ($157 potential increase over avg. RT price).
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Cheapest flight prices on average. 15% potential price decrease ($32 potential savings vs. average RT price).
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Average for round-trip flights in August 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 August 18, 2025.

This American Airlines deal was found by Cheapflights users on 8/16. 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 9/186:10 amONT - STS
1 stop6h 19mAmerican Airlines
Tue 9/231:00 pmSTS - ONT
1 stop5h 16mAmerican Airlines
Deal found 8/16$237
This American Airlines deal was found by Cheapflights users on 8/17. 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 9/66:10 amONT - STS
1 stop6h 19mAmerican Airlines
Tue 9/91:00 pmSTS - ONT
1 stop5h 16mAmerican Airlines
Deal found 8/17$257
This American Airlines deal was found by Cheapflights users on 8/16. 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.
Sun 8/319:00 amONT - STS
1 stop6h 47mAmerican Airlines
Thu 9/41:00 pmSTS - ONT
1 stop5h 16mAmerican Airlines
Deal found 8/16$258
This American Airlines deal was found by Cheapflights users on 8/15. 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.
Fri 8/296:17 amONT - STS
1 stop6h 12mAmerican Airlines
Sun 8/3112:59 pmSTS - ONT
1 stop5h 42mAmerican Airlines
Deal found 8/15$277
This American Airlines deal was found by Cheapflights users on 8/16. 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.
Wed 10/16:10 amONT - STS
1 stop6h 19mAmerican Airlines
Sat 10/41:00 pmSTS - ONT
1 stop5h 16mAmerican Airlines
Deal found 8/16$287
This American Airlines deal was found by Cheapflights users on 8/18. 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 9/26:17 amONT - STS
1 stop6h 12mAmerican Airlines
Sat 9/61:00 pmSTS - ONT
1 stop5h 16mAmerican Airlines
Deal found 8/18$307
This American Airlines deal was found by Cheapflights users on 8/17. 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.
Mon 9/16:17 amONT - STS
1 stop6h 12mAmerican Airlines
Mon 9/84:19 pmSTS - ONT
1 stop5h 29mAmerican Airlines
Deal found 8/17$309
This American Airlines deal was found by Cheapflights users on 8/18. 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 9/276:10 amONT - STS
1 stop6h 19mAmerican Airlines
Mon 9/294:19 pmSTS - ONT
1 stop5h 29mAmerican Airlines
Deal found 8/18$319
This Alaska Airlines deal was found by Cheapflights users on 8/17. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/166:00 amONT - STS
1 stop14h 23mAlaska Airlines
Tue 9/237:00 amSTS - ONT
1 stop27h 44mAlaska Airlines
Deal found 8/17$322
This Alaska Airlines deal was found by Cheapflights users on 8/17. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/87:47 pmONT - STS
1 stop24h 36mAlaska Airlines
Fri 9/127:00 amSTS - ONT
1 stop27h 44mAlaska Airlines
Deal found 8/17$342
This lastminute.com deal was found by Cheapflights users on 8/16. 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 9/67:10 amONT - STS
2 stops13h 13mAlaska Airlines
Mon 9/87:00 amSTS - ONT
1 stop27h 44mAlaska Airlines
Deal found 8/16$348
This Alaska Airlines deal was found by Cheapflights users on 8/16. 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.
Fri 9/267:40 pmONT - STS
1 stop24h 43mAlaska Airlines
Sun 9/287:00 amSTS - ONT
1 stop27h 44mAlaska Airlines
Deal found 8/16$352

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 August 18, 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

Thu 9/18

6:10 am-12:29 pm

1 stop6h 19m

Santa Rosa Sonoma County

Tue 9/23

1:00 pm-6:16 pm

1 stop5h 16m

$237

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 9/6

6:10 am-12:29 pm

1 stop6h 19m

Santa Rosa Sonoma County

Tue 9/9

1:00 pm-6:16 pm

1 stop5h 16m

$257

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sun 8/31

9:00 am-3:47 pm

1 stop6h 47m

Santa Rosa Sonoma County

Thu 9/4

1:00 pm-6:16 pm

1 stop5h 16m

$258

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Mon 12/8

10:34 am-3:54 pm

1 stop5h 20m

Santa Rosa Sonoma County

Wed 12/10

4:16 pm-9:37 pm

1 stop5h 21m

$277

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Fri 8/29

6:17 am-12:29 pm

1 stop6h 12m

Santa Rosa Sonoma County

Sun 8/31

12:59 pm-6:41 pm

1 stop5h 42m

$277

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Wed 10/1

6:10 am-12:29 pm

1 stop6h 19m

Santa Rosa Sonoma County

Sat 10/4

1:00 pm-6:16 pm

1 stop5h 16m

$287

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Sat 9/6

6:00 am-1:36 pm

1 stop7h 36m

Santa Rosa Sonoma County

Mon 9/8

7:00 am-10:44 am

1 stop27h 44m

$307

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Mon 9/1

6:17 am-12:29 pm

1 stop6h 12m

Santa Rosa Sonoma County

Mon 9/8

4:19 pm-9:48 pm

1 stop5h 29m

$309

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Tue 9/16

6:00 am-8:23 pm

1 stop14h 23m

Santa Rosa Sonoma County

Tue 9/23

7:00 am-10:44 am

1 stop27h 44m

$322

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Mon 9/8

7:47 pm-8:23 pm

1 stop24h 36m

Santa Rosa Sonoma County

Fri 9/12

7:00 am-10:44 am

1 stop27h 44m

$342

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/16

Showing 1-10 of 20 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 August 18, 2025.

It’s optimal to fly from Ontario to Santa Rosa in the morning. By choosing this option you can save up to 61% 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 August 18, 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

Crew

8.2

Boarding

7.6

Overall

7.5

Entertainment

5.0

Comfort

7.1

Food

5.1

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

Crew

8.2

Boarding

7.6

Overall

7.5

Entertainment

5.0

Comfort

7.1

Food

5.1

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

Crew

8.2

Boarding

7.6

Overall

7.5

Entertainment

5.0

Comfort

7.1

Food

5.1

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 6h 19m. 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 71% 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 August 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
Avelo AirlinesCheapest$67Average$86FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$222Average$282FlexibilityNo cancel feeOn-time71%

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