ONT - STS

$79 Find Cheap Flights from Ontario to Santa Rosa

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Santa Rosa departing on 3/25. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Santa Rosa

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Santa Rosa, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Santa Rosa, as well as popular online travel agencies
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41,299,237 searches in the past 7 days on KAYAK

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Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$117
Typical prices: $247-$366
Alaska Airlines
Thu 3/19Mon 3/23
ONT - STS • Non-stop
Cheapest one-way
$79
Typical prices: $148-$184
Alaska Airlines
Wed 3/25
ONT - STS • Non-stop
Top airlines
Alaska Airlines
Cheapest • from $117 (round-trip)
Alaska Airlines
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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We hope you love your trip to Santa Rosa!
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Booking Insights
Flight Deals

Cheap Flights from Ontario to Santa Rosa (ONT-STS)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Santa Rosa that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Santa Rosa

Thu, Mar 19 - Mon, Mar 23
Alaska Airlines Logo
4:22 pm - 6:22 pm
ONT
-
STS
2h 00mnonstop
Alaska Airlines Logo
2:12 pm - 3:42 pm
STS
-
ONT
1h 30mnonstop
$117Alaska Airlines
Thu, Mar 19 - Sun, Mar 22
Alaska Airlines Logo
4:22 pm - 6:22 pm
ONT
-
STS
2h 00mnonstop
Alaska Airlines Logo
2:18 pm - 3:48 pm
STS
-
ONT
1h 30mnonstop
$127Alaska Airlines
Fri, Apr 17 - Mon, Apr 20
Alaska Airlines Logo
4:22 pm - 6:22 pm
ONT
-
STS
2h 00mnonstop
Alaska Airlines Logo
2:12 pm - 3:42 pm
STS
-
ONT
1h 30mnonstop
$137Alaska Airlines
Fri, Apr 3 - Sun, Apr 5
Alaska Airlines Logo
4:22 pm - 6:22 pm
ONT
-
STS
2h 00mnonstop
Alaska Airlines Logo
2:18 pm - 3:48 pm
STS
-
ONT
1h 30mnonstop
$147Alaska Airlines
Thu, May 21 - Tue, May 26
Alaska Airlines Logo
2:58 pm - 4:26 pm
ONT
-
STS
1h 28mnonstop
Alaska Airlines Logo
5:06 pm - 6:30 pm
STS
-
ONT
1h 24mnonstop
$157Alaska Airlines
Thu, Mar 26 - Mon, Mar 30
Alaska Airlines Logo
4:22 pm - 6:22 pm
ONT
-
STS
2h 00mnonstop
Alaska Airlines Logo
2:12 pm - 3:42 pm
STS
-
ONT
1h 30mnonstop
$167Alaska Airlines
Thu, Apr 30 - Mon, May 4
Alaska Airlines Logo
12:48 pm - 2:20 pm
ONT
-
STS
1h 32mnonstop
Alaska Airlines Logo
10:41 am - 12:08 pm
STS
-
ONT
1h 27mnonstop
$187Alaska Airlines
Tue, May 19 - Mon, May 25
Alaska Airlines Logo
2:58 pm - 4:26 pm
ONT
-
STS
1h 28mnonstop
Alaska Airlines Logo
5:06 pm - 6:30 pm
STS
-
ONT
1h 24mnonstop
$197Alaska Airlines
Fri, Mar 20 - Sun, Mar 22
Alaska Airlines Logo
4:22 pm - 6:22 pm
ONT
-
STS
2h 00mnonstop
Alaska Airlines Logo
2:18 pm - 3:48 pm
STS
-
ONT
1h 30mnonstop
$207Alaska Airlines
Fri, Apr 17 - Mon, Apr 20
Alaska Airlines Logo
7:00 am - 11:15 pm
ONT
-
STS
16h 15m
1 stop
Alaska Airlines Logo
2:12 pm - 3:42 pm
STS
-
ONT
1h 30mnonstop
$210Alaska Airlines
Booking Insights

KAYAK's insights & trends for Ontario to Santa Rosa flights

Get data-powered insights and trends into flights from Ontario to Santa Rosa to help you find the cheapest flights, the best time to fly and much more.

Can I save money by flying with a layover from Ontario to Santa Rosa?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of $167, prices are generally cheapest when you fly direct.

Good to know

Low seasonNovember
Cheapest flight$79
Best time to beat the crowds with an average 59% drop in price.
Most popular time to fly and prices are also 1% lower on average.
Flight from Ontario to Santa Rosa

When to book flights from Ontario to Santa Rosa

Are your dates flexible? Find out the best times to travel from Ontario to Santa Rosa based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Ontario to Santa Rosa

  • What is the cheapest flight from Ontario to Santa Rosa?

    In the last 3 days, the lowest price for a flight from Ontario to Santa Rosa was $79 for a one-way ticket and $117 for a round-trip.

  • Do I need a passport to fly between Ontario and Santa Rosa?

    No

  • Which airlines offer Wi-Fi service onboard planes from Ontario to Santa Rosa?

    Alaska Airlines, and Delta offer inflight Wi-Fi service on the Ontario to Santa Rosa flight route.

  • Which aircraft models fly most regularly from Ontario to Santa Rosa?

    The Airbus A320neo is the aircraft model that flies most regularly on the Ontario to Santa Rosa flight route.

  • Which airline alliances offer flights from Ontario to Santa Rosa?

    oneworld is the only airline alliance operating flights between Ontario and Santa Rosa.

  • On which days can I fly direct from Ontario to Santa Rosa?

    You can catch a nonstop flight from Ontario to Santa Rosa on on Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday.

  • Which is the best airline for flights from Ontario to Santa Rosa, Alaska Airlines or American Airlines?

    The two airlines most popular with KAYAK users for flights from Ontario to Santa Rosa are Alaska Airlines and American Airlines. With an average price for the route of $267 and an overall rating of 8.0, Alaska Airlines is the most popular choice. American Airlines is also a great choice for the route, with an average price of $366 and an overall rating of 7.2.

  • How does KAYAK find such low prices on flights from Ontario to Santa Rosa?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Santa Rosa.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Santa Rosa?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Santa Rosa from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Santa Rosa?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Santa Rosa with an airline and back to Ontario with another airline. Booking your flights between Ontario and STS can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Santa Rosa?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Santa Rosa from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Ontario to Santa Rosa

  • Looking for a cheap flight? 25% of our users found flights on this route for $157 or less round-trip.

Prefer to fly direct from Ontario to Santa Rosa?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Ontario to Santa Rosa Sonoma County.
Find which airlines fly direct from Ontario Airport to Santa Rosa Sonoma County Airport, which days they fly and book direct flights.

Direct departures

Ontario to Santa Rosa Sonoma County

Monday

Alaska Airlines

Alaska Airlines

Tuesday

Alaska Airlines

Alaska Airlines

Wednesday

Alaska Airlines

Alaska Airlines

Thursday

Alaska Airlines

Alaska Airlines

Friday

Alaska Airlines

Alaska Airlines

Saturday

Alaska Airlines

Alaska Airlines

Sunday

Alaska Airlines

Alaska Airlines

See more direct flights

Direct returns

Santa Rosa Sonoma County to Ontario

Monday

Alaska Airlines

Alaska Airlines

Tuesday

Alaska Airlines

Alaska Airlines

Wednesday

Alaska Airlines

Alaska Airlines

Thursday

Alaska Airlines

Alaska Airlines

Friday

Alaska Airlines

Alaska Airlines

Saturday

Alaska Airlines

Alaska Airlines

Sunday

Alaska Airlines

Alaska Airlines

See more direct flights

Reviews of the top airlines flying from Ontario to Santa Rosa

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Santa Rosa. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ontario to Santa Rosa? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
Alaska AirlinesOverall score based on 11874 reviews
8.1Boarding
8.5Crew
7.8Comfort
7.0Entertainment
7.1Food
Airline reviews

The he whole flight was very smooth on every aspects.

10.0 ExcellentPhilip, Feb 2026
SFO - SAN
Read more Alaska Airlines reviews

The he whole flight was very smooth on every aspects.

Due to plane delays on both legs of my flight home, I had to be rerouted from Santa Rosa to Las Vegas on Skywest and then to DCA on American. SkyWest airlines sat on runway in Las Vegas for 20 minutes waiting for gate to clear. My boarding pass for American that I was given by Alaska was incomplete and the Las Vegas airport lacked signage and departure boards. I barely made my flight bc it was so confusing. American Airlines has a much better wireless connection. I’ll never fly Alaska again. It clearly has problems.

I paid for wifi and it never worked... it was miserable. I couldn't access my shared files to work on the plane, it didn't work on my phone. I paid for nothing but frustration and continual refreshing, hoping it would work

Again, very smooth and all of the Alaska folks were great. They continue to meet all my needs.

Overall it was fine, however one of my two checked bags did not arrive and I was told it was left in Palm Springs. I don't understand how one of the two bags made it through fine but the other got lost .

The whole experience went smoothly with no hitches along the way.

The flight was excellent and very friendly and helpful staff. Will travel again and recommend to friends. Thank you

Did not have In flight service on my round trip due to turbulence. I did not partake in In flight entertainment. Flight descending into LAX was very turbulent. It would have been nice if the pilot communicated with us during that rough descent into LAX to ease the minds of some of us more nervous flyers.

They canceled my flight with only a couple hours before checking in at the airport and offered no alternatives to get home.

Was notified the departure would be late. Later on it was suddenly on time. Traffic by LAX was horrendous, and I missed the flight.

The flight was significantly delayed for 6.5 hours because of snow. There was no communication once the plane returned to the gate regarding when the flight would resume. Other flights were departing while our flight was being unloaded for reasons unknown. Our flight also seemed out of the queue regarding further deicing, refueling, and waiting to Taxi to the runway.

They are always late and seats was also not having working charger

did not have enough meal for first class passengers so offer us snack

Amazing I love American. I’ll never fly anyone else if I can help it.

The flight was on time and arrived early. The crew were friendly and helpful.

Everything about the flight was lovely. My only suggestion would be to offer a few more options of tv series from Apple TV or HBO.

After the door had been closed, the cockpit makes an announcement that catering is running late and it is not the airline's fault. It is their fault in the sense that we had to sit for 2 hours or more when we could have stayed in the terminal. Poor communications between catering and airline. This caused a young man to lose his temper and he went storming out hitting objects. He had complained to the gate agent that he had already waited at the gate 7 hours and when can the airplane leave? Airilnes do a poor job of explaining delays, maintenance issues, etc. whereas being truthful may gain more sympathy or understanding.

We were told the flight was delayed 5 times, then it was moved to the next day.

The experience with American Airlines was good, although the Philippines Airlines flight was much better (better seats, better food, better entertainment options, overall better). Again, the MIA to LAX flight was fine, but nothing in comparison to the comfort and accommodations of the Philippines Airlines flight from LAX to MNL.

Loved the crew . Absolutely no complaints. Except for luggage lost

Everything you need to know for your flight from Ontario to Santa Rosa

Information on your arrival and departure airports