ONT - STS

$89 Find Cheap Flights from Ontario to Santa Rosa - Compare and Save

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 10/18. 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

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Everything you should know

Cheapest round-trip
$157
Typical prices: $212-$307
Alaska Airlines
Thu 8/27Mon 8/31
ONT - STS • Non-stop
Cheapest non-stop
$157
Typical prices: $230-$267
Alaska Airlines
Thu 8/27Sat 9/5
ONT - STS • Non-stop
Top airlines
Cheapest • from $157 (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 31m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
When to travel
Cheapest • 100% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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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, Aug 27 - Mon, Aug 31
Alaska Airlines Logo
4:27 pm - 6:07 pm
ONT
-
STS
1h 40mnonstop
Alaska Airlines Logo
2:09 pm - 3:47 pm
STS
-
ONT
1h 38mnonstop
$157Alaska Airlines
Sat, Aug 22 - Mon, Aug 24
Alaska Airlines Logo
4:32 pm - 6:12 pm
ONT
-
STS
1h 40mnonstop
Alaska Airlines Logo
2:09 pm - 3:47 pm
STS
-
ONT
1h 38mnonstop
$161Alaska Airlines
Sat, Aug 22 - Sun, Aug 30
Alaska Airlines Logo
4:32 pm - 6:12 pm
ONT
-
STS
1h 40mnonstop
Alaska Airlines Logo
2:09 pm - 3:47 pm
STS
-
ONT
1h 38mnonstop
$167Alaska Airlines
Thu, Aug 27 - Mon, Aug 31
Alaska Airlines Logo
4:27 pm - 6:07 pm
ONT
-
STS
1h 40mnonstop
Alaska Airlines Logo
2:09 pm - 3:47 pm
STS
-
ONT
1h 38mnonstop
$177Alaska Airlines
Wed, Sep 2 - Wed, Sep 9
Southwest Logo
3:00 pm - 9:25 pm
ONT
-
STS
6h 25m
2 stops
Southwest Logo
6:00 am - 1:35 pm
STS
-
ONT
7h 35m
2 stops
$187Southwest
Sat, Aug 15 - Sat, Aug 22
Alaska Airlines Logo
6:43 pm - 8:14 pm
ONT
-
STS
1h 31mnonstop
Alaska Airlines Logo
2:14 pm - 3:52 pm
STS
-
ONT
1h 38mnonstop
$192Alaska Airlines
Thu, Aug 27 - Sun, Aug 30
Alaska Airlines Logo
4:27 pm - 6:07 pm
ONT
-
STS
1h 40mnonstop
Alaska Airlines Logo
2:09 pm - 3:47 pm
STS
-
ONT
1h 38mnonstop
$197Alaska Airlines
Wed, Aug 26 - Sun, Aug 30
Alaska Airlines Logo
4:27 pm - 6:07 pm
ONT
-
STS
1h 40mnonstop
Alaska Airlines Logo
2:09 pm - 3:47 pm
STS
-
ONT
1h 38mnonstop
$198Alaska Airlines
Thu, Aug 20 - Sun, Aug 23
Alaska Airlines Logo
4:27 pm - 6:07 pm
ONT
-
STS
1h 40mnonstop
Alaska Airlines Logo
2:09 pm - 3:47 pm
STS
-
ONT
1h 38mnonstop
$202Alaska Airlines
Sat, Sep 19 - Sun, Sep 20
Alaska Airlines Logo
4:27 pm - 6:07 pm
ONT
-
STS
1h 40mnonstop
Alaska Airlines Logo
2:09 pm - 3:47 pm
STS
-
ONT
1h 38mnonstop
$204Alaska 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 August.

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 Wednesday, as we generally find the cheapest rates on that day for this route. On the other hand, Sunday is the most expensive day to fly from Ontario to Santa Rosa. For your return ticket, we recommend flying on a Thursday and avoiding Mondays for the best deals.

What is the cheapest month to fly from Ontario to Santa Rosa?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Santa Rosa, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Ontario to Santa Rosa is February, where tickets cost $0 (return) on average. On the other hand, the most expensive months are October and September, where the average cost of round-trip tickets is $536 and $432 respectively.

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 $252, prices are generally cheapest when you fly direct.

Good to know

Low seasonNovember
Cheapest flight$89
Best time to beat the crowds with an average 56% drop in price.
Most popular time to fly and prices are also 36% 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 5 days, the lowest price for a flight from Ontario to Santa Rosa was $89 for a one-way ticket and $157 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, Delta, and American Airlines 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 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 $227 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 $506 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 $227 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 12607 reviews
7.1Food
8.1Boarding
7.8Comfort
8.5Crew
7.0Entertainment
Airline reviews

We showed up to our gate less than 15 minutes after boarding started and they wouldn’t let us in. It was still 15 minutes even before take off so we’re weren’t even late to the flight.

4.0 OkayAnonymous, Jun 2026
PDX - STS
Read more Alaska Airlines reviews

We showed up to our gate less than 15 minutes after boarding started and they wouldn’t let us in. It was still 15 minutes even before take off so we’re weren’t even late to the flight.

The flight itself was great. But we had to wait over an hour to deplane so I missed my train. Not the crews fault. They were wonderful!

Wish there were more complimentary drinks available - only had water and apple juice. Also - no snacks were provided during the flight, but we were offered some items as we exited the plane.

On this flight there wer only 25 people on board. So no one in 5 rows ahead of me and noone in 7 rows behind me. So very chill.

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.

You need a n/a category. Too short a flight for food. I love flying on Alaska from Santa Rosa Airport!

Online check in didn't work. Somehow ended up with 2 Alaska rewards numbers and 1 for Hawaiian. No one at check in could figure out what to do. No one at check in could help me confirm an upcoming flight on Hawaiian Airlines.

Was flying out of a small airport so that I could avoid long lines. However, Alaska Airlines wanted me to check in two hours in advance. I was there fifty minutes ahead of time, but because I didn't check in the Alaska Air app deleted the trip all together. By the time I was able to speak with someone and get a new boarding pass twenty minutes had passed and they wouldn't let me board the flight. Poor communication through the app, gate agents were unhelpful, and overall felt like Alaska Airlines doesn't care whether they do a good job or not. Will avoid as much as possible. Southwest Air seems like a better airline.

It was cancelled due to crew. I missed a special family graduation due to this

don't take off if you can't land at the destination

The flight attendant was very polite and attentive. The food was good.

Flight cancelled. Twice. And no communication. No gate agent. Went past boarding time and had to go and see email from AA. Airport communication was bad

Ontario airport boarding was very easy to park and access, is clean and TSA took 10 minutes total. Check-in was a breeze and cruise was very nice.

Good flight, seated and had a water within 5 minutes. Crew was hospitable.

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.

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

The chair cushions may need an upgrade. I have been noticing they are so worn out, thin so you’d sit in a dip 😄. Other than that, all was an enjoyable trip. Thanks AA!

VERY disappointed at the agent checking in my luggage. I know that the weight limit is 23 kg, a little over 50 pounds (50.71 pounds). Yet the agent kept repeating "50 pounds". So I said, the limit is 23 kg, and she had the audacity to say 'no, it is 22 kg!" Imagine my surprise. Was she ignorant or was she poorly trained? Not sure. The boarding process was pretty good. The speakers were loud enough so I still could hear them despite inconsiderate passengers continuing to speak while the announcements were going on. During the flight, the teenage girl sitting behind me kept pressing her feet to the back of my chair. I turned around several times, yet she did not get the hint. I did not make a fuss since I sense I had a bad streak that night with AA, so I just did the best I can to lean forward and not let that bother me.

It was wonderful upgrading to first. Plane was so cold thou. Crew was great. Wish there was a food option in first for such a long flight. Doesnt matter the time of day. Chintzy.

The flight landed at LAX we were then bussed to collect our bags. That process took nearly as long as the flight. Luckily we weren't in a hurry!

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

Information on your arrival and departure airports