ONT - STS

$139 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 10/22. 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

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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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, Jan 24 - Tue, Jan 27
American Airlines Logo
9:59 am - 3:53 pmONT-STS
5h 54m1 stop
American Airlines Logo
12:55 pm - 6:20 pmSTS-ONT
5h 25m1 stop
$237American Airlines
Find Deal
Thu, Oct 23 - Mon, Oct 27
American Airlines Logo
10:09 am - 3:47 pmONT-STS
5h 38m1 stop
American Airlines Logo
4:17 pm - 9:49 pmSTS-ONT
5h 32m1 stop
$257American Airlines
Find Deal
Thu, Oct 23 - Mon, Oct 27
American Airlines Logo
10:09 am - 3:47 pmONT-STS
5h 38m1 stop
American Airlines Logo
4:17 pm - 9:49 pmSTS-ONT
5h 32m1 stop
$258American Airlines
Find Deal
Fri, Oct 31 - Sun, Nov 2
American Airlines Logo
6:15 am - 12:21 pmONT-STS
6h 06m1 stop
American Airlines Logo
4:23 pm - 9:59 pmSTS-ONT
5h 36m1 stop
$277American Airlines
Find Deal
Wed, Oct 29 - Wed, Nov 5
Alaska Airlines Logo
6:00 am - 10:05 pmONT-STS
16h 05m1 stop
Alaska Airlines Logo
7:00 am - 8:53 pmSTS-ONT
13h 53m1 stop
$283Alaska Airlines
Find Deal
Thu, Jan 29 - Sat, Jan 31
Alaska Airlines Logo
4:03 pm - 10:32 pmONT-STS
6h 29m1 stop
Alaska Airlines Logo
11:15 am - 8:36 pmSTS-ONT
9h 21m1 stop
$284Alaska Airlines
Find Deal
Fri, Jan 9 - Mon, Jan 12
Alaska Airlines Logo
6:00 am - 10:35 amONT-STS
28h 35m1 stop
Alaska Airlines Logo
8:16 pm - 8:36 pmSTS-ONT
24h 20m1 stop
$285Alaska Airlines
Find Deal
Tue, Nov 4 - Wed, Nov 12
Alaska Airlines Logo
4:11 pm - 1:26 pmONT-STS
21h 15m1 stop
Alaska Airlines Logo
2:22 pm - 8:53 pmSTS-ONT
6h 31m1 stop
$302Alaska Airlines
Find Deal
Mon, Nov 3 - Sat, Nov 15
Alaska Airlines Logo
6:11 pm - 1:26 pmONT-STS
19h 15m1 stop
Alaska Airlines Logo
2:22 pm - 8:53 pmSTS-ONT
6h 31m1 stop
$312Alaska Airlines
Find Deal
Thu, Oct 30 - Tue, Nov 4
Alaska Airlines Logo
4:11 pm - 10:05 pmONT-STS
5h 54m1 stop
Alaska Airlines Logo
7:00 am - 8:53 pmSTS-ONT
13h 53m1 stop
$313Alaska Airlines
Find Deal

Everything you should know

Top airlines
American Airlines
Cheapest • from $237 (round-trip)
Avelo Airlines
Best reviews • 7.5 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
December
Cheapest • 72% price drop
March
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$237
Overall average: $256
American Airlines
Sat 1/24Tue 1/27
ONT - STS • 1 stop
Cheapest one-way
$139
American Airlines
Wed 10/22
ONT - STS • 1 stop
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Santa Rosa!
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.

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 Sunday, as we generally find the cheapest rates on that day for this route. On the other hand, Wednesday is the most expensive day to fly from Ontario to Santa Rosa. For your return ticket, we recommend flying on a Friday and avoiding Wednesdays 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 December, where tickets cost $72 (return) on average. On the other hand, the most expensive months are October and September, where the average cost of round-trip tickets is $587 and $369 respectively.

Good to know

Low seasonJanuary
Cheapest flight$139
Best time to beat the crowds but there is an average 1% increase in price.
Most popular time to fly and prices are also 61% 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 $139 for a one-way ticket and $237 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 Delta 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 Airbus A319 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.

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

    The two airlines most popular with KAYAK users for flights from Ontario to Santa Rosa are Avelo Airlines and American Airlines. With an average price for the route of $85 and an overall rating of 7.5, Avelo Airlines is the most popular choice. American Airlines is also a great choice for the route, with an average price of $306 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.

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.
7.5
Avelo AirlinesOverall score based on 80 reviews
5.0Entertainment
5.0Food
7.7Boarding
7.1Comfort
8.2Crew
Airline reviews

Short 2-hour flight, we took off on time, ETA was earlier than stated, no interaction needed with stewards, no food, no entertainment on such a short flight.

10.0 ExcellentChristina, Sep 2025EUG - BUR
Read more Avelo Airlines reviews

Short 2-hour flight, we took off on time, ETA was earlier than stated, no interaction needed with stewards, no food, no entertainment on such a short flight.

Avelo provided exactly what I expected. They are a low-cost option with no frills but the experience was comfortable and the staff was great! I will be using them in the future for trips when cost is a priority for me.

Expect nothing and you will be fine. Seats are crammed.

Terrible landing. Uncomfortable seats. Great cabin crew-helpful and pleasant!

Tight fit in middle seat but OK for short flight. Crew was more interested in talking to each other than helping passengers - strickingly dissappointing. DAB is a great airport. New Haven sucks! Excellent value for the .

Avelo is definitely a budget airline and you get what you pay for. The plane was packed and the seats were not particularly comfortable. Staff was very nice and both of our flights were on time. The one thing I wish I had known was that the staff does not show up at the airport desk to check your bags until two hours before the flight. We had a 4:30 flight and had to check out of our hotel at noon. Since we have lounge passes we planned to check our bag, go through security and hang out at the lounge until we had to board. But because we could not check our bag until 2:30, when the staff showed up, we could not go through security and access the lounge. Passengers with boarding passes and carry on luggage would not have this issue. I might fly Avelo again but would only do carry on or plan to get to the airport no sooner than two hours before check in. And I would not recommend a long flight on Avelo since there is no food or entertainment and the seats are not comfortable.

No food or entertainment, but flight very comfortable and on time.

Baggage claim was barbaric at Wilmington. I realize that this is a startup airline but if they hope to grow or even survive they need to upgrade this airport. There is no automated luggage carousel and at times you are not only fighting your fellow passengers to get to your bags but also passengers coming in from other flights who cross right in front of you

No frills, i.e., no drinks or snacks. One is charged for everything. The cost really adds up. The crew and flight attendants were excellent and very pleasant.

I always walk by a pallet of Avelo branded mini bottles of water on the tarmac, but I’ve never seen them in flight. Yup, not even water offered on a 3 hour flight. No wi-fi onboard. We just watch the flight crew on their phone for 3 hours every flight. At least a mid-flight trash pickup would be great. Better than my last flight, but they only could have gone up from there. Don’t use for business or ticketed vacation like Disney… too unreliable.

The flight crew was rude. We were in first class and no one even offered water until an hour after we were in the air. Horrible experience

Great. Quick and quiet and east. The breakfast choices were a welcome surprise!

The stewardess hit me with the food kart twice on the head and didn't say I'm sorry once. The same stewardess gave me a warm Apple Juice with No ice. The Flight was delayed for Departure 6 times, starting from 2:36pm, finally taking off 7:50pm. I was late picking up my child from the sitter by 3 hours.

Did not get the seat I selected and paid for.

My flight was delayed for several hours. Sitting at gate 16 for several hours, I got a text from Kayak the gate changed to 9 before it was announced. Very bad communication at each gate from American Airlines employees. I received 10 notifications of delay from Kayak. My vacation started off horrible! I will write to American Airlines corporate office also.

Delayed flight that lead to a missed connection and a 5-hour trip became a 12-hour flight 🙄

There is no room, no gluten free options, or any free internet/entertainment. You have to bring your own tablet or smartphone because there are no screens.

Amazing food, great staff, with one noticable detail missing ...but no seat entertainment in any of aircraft ...I am not a fan

Boarding gate in Honolulu was staffed with a great clerk with a soothing voice despite the flight delay of over an hour. Flight attendants in the plane were all grumpy, not pleasant looking bunch. Their sour attitude showed throughout the flight. Inly able to get a select few movies started. Most of the movie links in the “free entertainment” did not work.

This was a horrible experience. For a first class experience, my chair was held together by 3M tape - and I have a photo. The crew weren’t very attentive, somewhat dismissive and forgot my drink and snack, the chair reclined about 3 inches on a 6-hour cross country flight. I was also not informed that there was no lounge available in Newark airport because of renovations, so all around this was one of the worst experiences and I would actively avoid both American and Alaska Air going forward.

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

Information on your arrival and departure airports

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