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Santa Rosa

$70+ 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 8/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — STS
Jul 19 — Jul 261
Sun 7/19
Sun 7/26
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 June 19, 2026.

This Delta deal was found by Cheapflights users on 6/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/36:00 am
ONT
-
STS
1 stop4h 39m
Delta
Wed 11/1111:25 am
STS
-
ONT
1 stop4h 47m
Delta
Deal found 6/18$157
This Alaska Airlines deal was found by Cheapflights users on 6/18. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/36:31 pm
ONT
-
STS
Nonstop1h 36m
Alaska Airlines
Tue 11/103:02 pm
STS
-
ONT
Nonstop1h 30m
Alaska Airlines
Deal found 6/18$167
This Alaska Airlines deal was found by Cheapflights users on 6/15. 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.
Fri 10/165:48 pm
ONT
-
STS
Nonstop1h 31m
Alaska Airlines
Mon 10/193:40 pm
STS
-
ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/15$177
This Alaska Airlines deal was found by Cheapflights users on 6/15. 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 9/94:27 pm
ONT
-
STS
Nonstop1h 40m
Alaska Airlines
Sun 9/132:09 pm
STS
-
ONT
Nonstop1h 38m
Alaska Airlines
Deal found 6/15$187
This Alaska Airlines deal was found by Cheapflights users on 6/18. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/16:31 pm
ONT
-
STS
Nonstop1h 36m
Alaska Airlines
Tue 11/103:02 pm
STS
-
ONT
Nonstop1h 30m
Alaska Airlines
Deal found 6/18$192
This Alaska Airlines deal was found by Cheapflights users on 6/15. 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.
Thu 9/104:27 pm
ONT
-
STS
Nonstop1h 40m
Alaska Airlines
Sun 9/132:09 pm
STS
-
ONT
Nonstop1h 38m
Alaska Airlines
Deal found 6/15$197
This Southwest deal was found by Cheapflights users on 6/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/162:40 pm
ONT
-
STS
2 stops6h 45m
Southwest
Sun 9/207:05 am
STS
-
ONT
2 stops6h 05m
Southwest
Deal found 6/16$198
This CheapOair deal was found by Cheapflights users on 6/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/214:27 pm
ONT
-
STS
Nonstop1h 40m
Alaska Airlines
Wed 8/262:09 pm
STS
-
ONT
Nonstop1h 38m
Alaska Airlines
Deal found 6/15$199
This Delta deal was found by Cheapflights users on 6/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/26:00 am
ONT
-
STS
1 stop4h 39m
Delta
Wed 11/114:55 pm
STS
-
ONT
1 stop6h 53m
Delta
Deal found 6/18$202
This Alaska Airlines deal was found by Cheapflights users on 6/14. 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.
Thu 11/56:31 pm
ONT
-
STS
Nonstop1h 36m
Alaska Airlines
Sun 11/83:02 pm
STS
-
ONT
Nonstop1h 30m
Alaska Airlines
Deal found 6/14$212
This Southwest deal was found by Cheapflights users on 6/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/153:30 pm
ONT
-
STS
2 stops7h 20m
Southwest
Wed 7/226:00 am
STS
-
ONT
2 stops6h 55m
Southwest
Deal found 6/15$215
This Southwest deal was found by Cheapflights users on 6/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/215:30 am
ONT
-
STS
1 stop5h 35m
Southwest
Thu 7/233:55 pm
STS
-
ONT
1 stop4h 15m
Southwest
Deal found 6/17$218

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 June 19, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$157
(Priceline)

One-way from

$70
(Southwest)

Popular in

October

Cheapest in

November

Average price

$187

Good round-trip deal

$227 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. 21% potential increase in price ($76 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease ($25 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 June 19, 2026.
Use the filters below to find and compare flights from Ontario to Santa Rosa that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 9/10

4:27 pm-6:07 pm

Nonstop1h 40m

Santa Rosa Sonoma County

Sun 9/13

2:09 pm-3:47 pm

Nonstop1h 38m

$197
Quickest round-trip

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Wed 7/8

6:43 pm-8:14 pm

Nonstop1h 31m

Santa Rosa Sonoma County

Sat 7/11

4:35 pm-6:03 pm

Nonstop1h 28m

$227

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Tue 7/7

6:43 pm-8:14 pm

Nonstop1h 31m

Santa Rosa Sonoma County

Wed 7/15

4:35 pm-6:03 pm

Nonstop1h 28m

$227

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 7/9

6:43 pm-8:14 pm

Nonstop1h 31m

Santa Rosa Sonoma County

Tue 7/14

4:35 pm-6:03 pm

Nonstop1h 28m

$227

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Wed 9/16

5:45 am-11:20 am

1 stop5h 35m

Santa Rosa Sonoma County

Sun 9/20

7:05 am-1:10 pm

2 stops6h 05m

$269

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Wed 7/1

6:43 pm-8:14 pm

Nonstop1h 31m

Santa Rosa Sonoma County

Wed 7/8

4:35 pm-6:03 pm

Nonstop1h 28m

$287

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Fri 9/25

4:00 pm-10:35 pm

2 stops6h 35m

Santa Rosa Sonoma County

Mon 9/28

6:05 am-12:10 pm

2 stops6h 05m

$302

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Wed 9/16

12:12 pm-9:59 pm

1 stop9h 47m

Santa Rosa Sonoma County

Sun 9/20

2:09 pm-3:47 pm

Nonstop1h 38m

$330

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 9/3

4:27 pm-6:07 pm

Nonstop1h 40m

Santa Rosa Sonoma County

Mon 9/7

7:03 am-11:16 am

1 stop28h 13m

$350

OntarioSanta Rosa

ONT - STS

ONTSTS

Ontario

Thu 7/23

4:40 pm-11:35 pm

2 stops6h 55m

Santa Rosa Sonoma County

Fri 7/24

3:55 pm-8:10 pm

1 stop4h 15m

$362

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/15

Showing 1-10 of 22 resultsSorted by cheapest first
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 June.
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 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 June 19, 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 at noon.

How much does it cost to fly round-trip from Ontario to Santa Rosa?

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 June 19, 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
7.9
Good
12,538 reviews

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.0

Overall

7.9

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
7.9
Good
12,538 reviews
Alaska Airlines
7.9
Good
12,538 reviews

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.0

Overall

7.9

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
7.1
Good
11,699 reviews
Alaska Airlines
7.9
Good
12,538 reviews

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Food

7.0

Overall

7.9

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.

  • What airports do I use to fly from Ontario to Santa Rosa?

    You will need to book a flight from Ontario to Santa Rosa Sonoma County if you want to fly from Ontario to Santa Rosa. At least 2 different airlines have flights from Ontario (ONT) to Sonoma County (STS) on a regular basis. There is 1 flight to Santa Rosa from the Ontario airport per day. If you manage to book one that is nonstop, then you can expect the flight time from ONT to STS to be around 1h 31m.

  • How long is the flight from Ontario to Santa Rosa?

    Departing from Ontario to Santa Rosa will take you 1h 40m. 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 $107. Another airline that can offer you cheap pricing is Alaska Airlines. American Airlines is currently priced 62% below the average price you’ll pay for this route.

  • What are the most reliable airlines from Ontario to Santa Rosa?

    Before booking your flight to Santa Rosa from Ontario, check out the most reliable airlines to get you to your destination on time: Horizon Air (100%), Alaska Airlines (97%), SkyWest Airlines( 96%).

  • What are the cheapest flights from Ontario to Santa Rosa?

    Looking at all options, your cheapest flight can be booked for $227. While the most popular route (Ontario - Santa Rosa Sonoma County) can be booked for $167 on average, our data indicates $257 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.

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 June 19, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$107Average$506FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$117Average$227FlexibilityNo cancel feeOn-time75%

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