ONT - STS

$77 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 4/28. 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: $255-$217
Alaska Airlines
Sat 5/9Tue 5/12
ONT - STS • Non-stop
Cheapest one-way
$77
Typical prices: $98-$138
Alaska Airlines
Tue 4/28
ONT - STS • Non-stop
Top airlines
Cheapest • from $117 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with Alaska Airlines. Average duration is 1h 32m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $348 (round-trip)
Shortest trip • 5h 38m (one-way)
Insights
Insights
Insights
Insights
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Santa Rosa!
Flight Deals
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

Sat, May 9 - Tue, May 12
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
$117Alaska Airlines
Sat, Apr 25 - Wed, Apr 29
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
$137Alaska Airlines
Thu, Apr 23 - Tue, Apr 28
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
$147Alaska Airlines
Sat, Apr 25 - Tue, Apr 28
Southwest Logo
5:30 am - 11:25 am
ONT
-
STS
5h 55m
1 stop
Southwest Logo
4:35 pm - 10:10 pm
STS
-
ONT
5h 35m
1 stop
$151Southwest
Sat, Apr 25 - Tue, Apr 28
Southwest Logo
12:50 pm - 8:30 pm
ONT
-
STS
7h 40m
2 stops
Southwest Logo
4:35 pm - 10:10 pm
STS
-
ONT
5h 35m
1 stop
$156Southwest
Thu, Apr 23 - Tue, Apr 28
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
$157Alaska Airlines
Sat, Apr 25 - Tue, Apr 28
Southwest Logo
12:50 pm - 8:30 pm
ONT
-
STS
7h 40m
2 stops
Southwest Logo
6:00 am - 1:45 pm
STS
-
ONT
7h 45m
2 stops
$161Southwest
Mon, Apr 20 - Tue, Apr 28
Alaska Airlines Logo
4:22 pm - 6:22 pm
ONT
-
STS
2h 00mnonstop
Alaska Airlines Logo
10:41 am - 12:08 pm
STS
-
ONT
1h 27mnonstop
$167Alaska Airlines
Thu, Apr 23 - Mon, Apr 27
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
$177Alaska Airlines
Tue, Apr 21 - Fri, Apr 24
Alaska Airlines Logo
4:22 pm - 6:22 pm
ONT
-
STS
2h 00mnonstop
Alaska Airlines Logo
10:41 am - 12:08 pm
STS
-
ONT
1h 27mnonstop
$187Alaska 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.

How much is a round-trip flight from Ontario to Santa Rosa?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Ontario to Santa Rosa departing in May.

What’s the cheapest day of the week to fly from Ontario to Santa Rosa?

The average price of all round-trip flights from Ontario to Santa Rosa clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to Santa Rosa on a Thursday, as we generally find the cheapest rates on that day for this route. On the other hand, Saturday is the most expensive day to fly from Ontario to Santa Rosa. For your return ticket, we recommend flying on a Wednesday and avoiding Fridays for the best deals.

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 $187, prices are generally cheapest when you fly direct.

Good to know

Low seasonNovember
Cheapest flight$77
Best time to beat the crowds with an average 59% drop in price.
Most popular time to fly and prices are also 42% 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 $77 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?

    Only Alaska Airlines offers inflight Wi-Fi service on the Ontario to Santa Rosa flight route.

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

    The Embraer 175 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?

    There are nonstop flights from Ontario to Santa Rosa on a daily basis.

  • 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 $187 and an overall rating of 7.9, Alaska Airlines is the most popular choice. American Airlines is also a great choice for the route, with an average price of $416 and an overall rating of 7.1.

  • 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 $88 or less one-way and $137 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.
7.9
Alaska AirlinesOverall score based on 12144 reviews
8.1Boarding
7.8Comfort
7.0Food
8.5Crew
7.0Entertainment
Airline reviews

The ticketing counter in SD was a mess. The lady handling the First-Class check-in seemed overwhelmed until a supervisor replaced her. It took almost 20 minutes to get once couple checked in, and then she started walking around the counters while 7 people just stood in line. Once her supervisor arrived, she announced she was going on break, never to engage with customers again.

6.0 GoodJim, Mar 2026
SAN - SMF
Read more Alaska Airlines reviews

The ticketing counter in SD was a mess. The lady handling the First-Class check-in seemed overwhelmed until a supervisor replaced her. It took almost 20 minutes to get once couple checked in, and then she started walking around the counters while 7 people just stood in line. Once her supervisor arrived, she announced she was going on break, never to engage with customers again.

It was ok! Not fond of sitting in middle seat. Tried to upgrade with my Atmos card but it was a new account and they weren’t able to look up my account details.

Four hour delay. Missed our event. And they offered me $75. Absolutely shameful.

I have been flying commercial for decades. I was in one of the ladder boarding groups, had my bag tagged because they thought there was not going to be enough space for it in the overhead bins. I politely asked one of the attendance if I could try to find a space- she said I could and I did. I then took the bag tag off and gave it to one of the other attendants as I was told to do by the first one. He, in a curt, anal, and disrespectful manner, told me that I needed to take my bag down from the overhead bin and check it. This was a situation I’ve never encountered before. The attendant’s attitude was confrontational and belittling in front of other onlooking passengers as if daring me to challenge him. I am a physician who takes care of patients day in and day out. Not wanting to make a scene, I calmly told him, “do what you need to do.” he took my bag down from the overhead bin, put the back tag back on it, and checked it only to make room for another bag that was also supposed to be technically checked by a following passenger. The same male attendant later came up to me and said “you shouldn’t have showed me the bag tag,” as if conveying that he was just following protocol was a justification for treating me like a kid out of line. I cared about this because it took 15 minutes from my life to then retrieve the bag at baggage claim and it also felt like really poor customer service. I understand the need for protocols. This is also a service industry, and we the passengers are the clients. We should be made to feel welcome and respected and our life in transit made as easy as it can be within reason. This attendant clearly needs to be reminded of that. Of note, an older female fellow passenger sitting next to me agreed with this assessment.

Departing flight for our weekend trip was cancelled due to weather which meant our return flight was useless. The whole thing was difficult to get support through but Alaska did recover and was able to reimburse us for the flights yesterday. For some reason, Kayak was not kept in the loop, adding to the confusion.

You sent me an email saying boarding was at 9:29 and AA sent one that was 8:29 on Sunday morning. I had to call AA to get that it was indeed 8:29.

Not bad. Due to not buying a seat, on the way back, my seat was not assigned till 2 hrs before the flight left. Got me worried I wouldn’t have a seat.

The airport crew and on board experience was fine. The problem with Alaska air is that there is zero customer service over the phone when you’re trying to buy your ticket or change anything.

There is no entertainment on the plane. The snack is minimal. The crew was nice and professional.

Good as usual. Just wished my seat was assigned at online check in. Thanks anyways

Delayed for mechanical and no updates on what was happening and how long the delay might be.

A first class seat should fit a fat person, and this doesn't. The trays in the armrest are less functional than an ordinary tray in the back of the seat.

The experience at checkin for my American Airlines flight from Sacramento to LAX was very good including the assistance I received in getting my bags checked in and boarding passes printed. Was pleasantly surprised the my bags were checked through all the way to my destination at Clark International Airport in Angeles, Philippines.

Smooth flight. From the early boarding and all were on board before departure time and arrived early in ONT. Great crew. Thank you!!!!

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.

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

Information on your arrival and departure airports