ONT - STS

$99 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 6/3. 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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Everything you should know

Cheapest round-trip
$137
Typical prices: $237-$157
Alaska Airlines
Wed 6/3Sat 6/6
ONT - STS • Non-stop
Cheapest one-way
$99
Typical prices: $138-$263
Alaska Airlines
Wed 6/3
ONT - STS • Non-stop
Top airlines
Cheapest • from $137 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Every day
You can fly direct with Alaska Airlines. Average duration is 1h 30m
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
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

Wed, Jun 3 - Sat, Jun 6
Alaska Airlines Logo
3:35 pm - 5:04 pm
ONT
-
STS
1h 29mnonstop
Alaska Airlines Logo
5:44 pm - 7:08 pm
STS
-
ONT
1h 24mnonstop
$137Alaska Airlines
Wed, Jun 3 - Mon, Jun 8
Alaska Airlines Logo
3:35 pm - 5:04 pm
ONT
-
STS
1h 29mnonstop
Alaska Airlines Logo
5:44 pm - 7:08 pm
STS
-
ONT
1h 24mnonstop
$157Alaska Airlines
Fri, Jun 5 - Mon, Jun 8
Alaska Airlines Logo
3:35 pm - 5:04 pm
ONT
-
STS
1h 29mnonstop
Alaska Airlines Logo
5:44 pm - 7:08 pm
STS
-
ONT
1h 24mnonstop
$177Alaska Airlines
Tue, Jun 2 - Tue, Jun 9
Alaska Airlines Logo
3:35 pm - 5:04 pm
ONT
-
STS
1h 29mnonstop
Alaska Airlines Logo
5:44 pm - 7:08 pm
STS
-
ONT
1h 24mnonstop
$182Alaska Airlines
Mon, Jun 1 - Wed, Jun 10
Alaska Airlines Logo
3:35 pm - 5:04 pm
ONT
-
STS
1h 29mnonstop
Alaska Airlines Logo
4:35 pm - 6:03 pm
STS
-
ONT
1h 28mnonstop
$202Alaska Airlines
Wed, Jun 3 - Fri, Jun 5
Alaska Airlines Logo
3:35 pm - 5:04 pm
ONT
-
STS
1h 29mnonstop
Alaska Airlines Logo
5:44 pm - 7:08 pm
STS
-
ONT
1h 24mnonstop
$217Alaska Airlines
Thu, Jul 9 - Mon, Jul 13
Alaska Airlines Logo
6:43 pm - 8:14 pm
ONT
-
STS
1h 31mnonstop
Alaska Airlines Logo
4:35 pm - 6:03 pm
STS
-
ONT
1h 28mnonstop
$227Alaska Airlines
Sat, Jun 6 - Tue, Jun 9
Alaska Airlines Logo
3:35 pm - 5:04 pm
ONT
-
STS
1h 29mnonstop
Alaska Airlines Logo
5:44 pm - 7:08 pm
STS
-
ONT
1h 24mnonstop
$237Alaska Airlines
Tue, Jun 9 - Thu, Jun 11
Alaska Airlines Logo
3:35 pm - 5:04 pm
ONT
-
STS
1h 29mnonstop
Alaska Airlines Logo
4:35 pm - 6:03 pm
STS
-
ONT
1h 28mnonstop
$242Alaska Airlines
Wed, Oct 21 - Sat, Oct 24
American Airlines Logo
10:29 am - 3:47 pm
ONT
-
STS
5h 18m
1 stop
American Airlines Logo
4:20 pm - 9:35 pm
STS
-
ONT
5h 15m
1 stop
$247American 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 June.

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 Monday, as we generally find the cheapest rates on that day for this route. On the other hand, Friday is the most expensive day to fly from Ontario to Santa Rosa. For your return ticket, we recommend flying on a Wednesday 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 $217, prices are generally cheapest when you fly direct.

Good to know

Low seasonNovember
Cheapest flight$99
Best time to beat the crowds with an average 55% drop in price.
Most popular time to fly and prices are also 41% 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 $99 for a one-way ticket and $137 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, American 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 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 $177 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 $98 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 12377 reviews
7.0Food
8.5Crew
8.1Boarding
7.0Entertainment
7.8Comfort
Airline reviews

Flight delayed no communication. The gate was changed so many times.

6.0 GoodAnonymous, May 2026
SAN - SJC
Read more Alaska Airlines reviews

Flight delayed no communication. The gate was changed so many times.

It is a hassle to not have entertainment screens on the backs of the seats.

I had to change my flight last minute due to a medical emergency. Their agent was compassionate and extremely helpful. This airlines really cares about making travel, for fun, work, or an emergency a customer-focused experience. Thank you!

No headphones provided. No gf food. Only 1 beverage cart run sAN to HNL. Rarely saw crew members

A solidly good experience, but would’ve appreciated more communication with regards to travel delays.

My daughter has anxiety and became nauseous after boarding the plane and before take off. She went to the plane bathroom and ended up having to vomit, and your staff promptly removed us from the flight. We explained that it was due to my daughter’s anxiety, and that the condition would not continue in the air, but they removed us anyway. We have flown many many times before on many different airlines and my daughter’s anxiety has resulted in nausea and sickness before takeoff, and every airline has been accommodating and professional. This is was our first time flying with your airline, and also the first time we have ever been removed from a flight. This was the worst service we have ever experienced. This was a special surprise trip we gifted to my daughter for graduating college. I had also paid to upgrade the family to first class and sit all together which we had never done before and can’t afford on a normal basis. Our removal from the flight was not only extremely embarrassing, but devastating for my daughter. My daughter and I were removed from the plane and a call was made by your staff to medical personnel, a few questions were asked of my daughter, and then she was magically cleared. All of this took mere minutes. Why this could not have been performed while we were on the plane, or why this could not have been performed off the plane and then us allowed to reboard is beyond me. My wife and youngest daughter continued on the original flight alone and were very upset and crying due to the situation, yet the staff did nothing to console or assist them. My wife states that upon arrival in Portland and as they were exiting the plane, one of the stewardesses involved said “byyyyeeeee” to them sarcastically and laughed. Myself and my oldest daughter had to wait 4 hours for an alternate flight and were sat in regular seats because our first class seat purchase could not be honored. My wife wasn’t allowed to pick up our rental car and had to wait 4 hours with our luggage until I arrived. The delay prevented us from being able to carry out planned events and ruined the first day of our trip. Upon explaining all of this to your customer service, we received no sympathy, assistance, or compensation other than your staff submitting a request for a reimbursement of my and my daughters first class upgrade cost. When checking in early for our flight back home, the luggage cost for myself and my eldest daughter was no longer discounted as it was for my wife and youngest daughter. Customer service once again could not assist me over the phone and rectify what should have been a minor adjustment. Instead they stated I would have to wait until we physically checked bags in at the airport and then ask staff to adjust the luggage cost. With everything else we had experienced, I was not going to leave that to chance and instead paid full price for the luggage ahead of time. Or experience with Alaska Airlines was a complete disaster and I am baffled at the lack of empathy and assistance from your staff. I’m not sure of what else to say other than the fact that unless we are compensated by Alaska Airlines in some form to offset the horrendous service we received, we will be relaying our experience to family and friends and on social media, and doing all we can to urge everyone to avoid utilizing your services.

I got an email 3 hours before the flight letting me know it got canceled

Boarding was easy and quick. Staff was very friendly. Service of snacks and drinks by staff was outstanding.

No issues and clear sailing. What a preferred to have sat in one of empty seats other than my assigned seat that would be my only complaint if it was to complain.

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.

American delayed the flight for a crew rest period. The delay occurred late in the evening - the earliest i can find is 10:20 pm. With a 6 am flight anyone on the flight would have already have been asleep (unless you are insane, a vampire or on drugs) and at least for me i was already on the way to the airport at 445 am the next morning when i discovered they delayed the flight until 9 am. Given the incoming flight was in the air at 6 pm the evening before this should have been figured out a lot more timely that was there only crew to use. Just frustrating given there is no consideration for customer experience anymore in flying.

Flight: Started on time. Comfortable flight. Arrived on time. Crew: Very cordial and helpful. Drinks and snack was served with a smile. Overall enjoyed the trip. Regards, Hari Doss Chanchala Doss

To have arrived on time and not 3 hours late after having already spent $100 to change to an earlier flight, only to arrive back home close to the original flight time.

American Airlines is a miserable experience. It is predictably miserable, in the sense that every time I fly American, I brace myself for the certainty that it will be unpleasant and uncomfortable. But it is unpredictable in the sense that I never know if the flight will be on time or delayed nine hours (both happened to me this week). I never know if I will be able to sit in the seat that I selected when I purchased the ticket or if I will be told by Customer Service (!!!) that I must relocate from first class to a seat in the back of the aircraft with no explanation (both happened to me this week). Will the food be frozen and half defrosted, or scalding hot? Will the drinks be warm? Will the flight attendants be surly and mean? Will the toilets be cramped and foul? Will the seats be narrow and uncomfortable? Will there be a real electric outlet at the seat, or just an unreliable USB-2 port? Will there be enough seats in the boarding lounge or just a few? Will the boarding process be smooth and efficient, or will the gate agents mess it up and delay it needlessly for 30 or 40 minutes? Will the catering and cleaning crew be prompt or will they take an extra 30 minutes? Will the brakes on the aircraft work properly, or will the pilot delay takeoff for four hours while the ground crew attends to what can only be described as routine maintenance that should have been done the night before? I've eexperienced every one of these unpleasant things this year, 2026. The only thing I can reliably count on is that American will find a new way to make the experience of flying as miserable as they possibly can.

Wifi was spotty. Tray table was very dirty when I sat down.

The WiFi would not connect enough for me to do my actual work. It permaspooled, disconnected, said it was connected, then wouldn't open an email... it was frustrating. I am not a tall person, 5'4" - and I felt cramped with little room to reach into my bag under the seat in front of me. I feel sorry for anyone taller than me having to fly. the one positive thing I will add, is the overhead bins are roomy enough to manage more bags than other carriers.

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

Going non stop to lax like I paid for. Not stopping in MCI for gas. Too long of delays

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.

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

Information on your arrival and departure airports