STS - ONT

$77 Find Cheap Flights from Santa Rosa to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Santa Rosa to Ontario departing on 5/13. 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 Ontario

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

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

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

Everything you should know

Cheapest round-trip
$110
Typical prices: $335-$222
Alaska Airlines
Sat 5/2Sat 5/9
STS - ONT • Non-stop
Cheapest one-way
$77
Alaska Airlines
Wed 5/13
STS - ONT • Non-stop
Top airlines
Cheapest • from $110 (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 27m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
When to travel
Cheapest • 47% 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 Ontario!
Flight Deals
Booking Insights
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Santa Rosa to Ontario 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 Santa Rosa to Ontario

Sat, May 2 - Sat, May 9
Alaska Airlines Logo
10:41 am - 12:08 pm
STS
-
ONT
1h 27mnonstop
Alaska Airlines Logo
12:48 pm - 2:20 pm
ONT
-
STS
1h 32mnonstop
$110Alaska Airlines
Tue, May 5 - Sat, May 9
Alaska Airlines Logo
10:41 am - 12:08 pm
STS
-
ONT
1h 27mnonstop
Alaska Airlines Logo
12:48 pm - 2:20 pm
ONT
-
STS
1h 32mnonstop
$117Alaska Airlines
Sat, May 9 - Wed, May 13
Alaska Airlines Logo
10:41 am - 12:08 pm
STS
-
ONT
1h 27mnonstop
Alaska Airlines Logo
3:35 pm - 5:04 pm
ONT
-
STS
1h 29mnonstop
$137Alaska Airlines
Thu, May 7 - Sat, May 16
Alaska Airlines Logo
10:41 am - 12:08 pm
STS
-
ONT
1h 27mnonstop
Alaska Airlines Logo
3:35 pm - 5:04 pm
ONT
-
STS
1h 29mnonstop
$147Alaska Airlines
Sat, Apr 25 - Sat, May 2
Southwest Logo
1:00 pm - 9:20 pm
STS
-
ONT
8h 20m
1 stop
Southwest Logo
5:30 am - 11:25 am
ONT
-
STS
5h 55m
1 stop
$151Southwest
Tue, Jun 2 - Sat, Jun 6
Southwest Logo
4:35 pm - 10:15 pm
STS
-
ONT
5h 40m
1 stop
Southwest Logo
5:40 am - 1:30 pm
ONT
-
STS
7h 50m
1 stop
$156Southwest
Tue, May 5 - Wed, May 6
Alaska Airlines Logo
10:41 am - 12:08 pm
STS
-
ONT
1h 27mnonstop
Alaska Airlines Logo
12:48 pm - 2:20 pm
ONT
-
STS
1h 32mnonstop
$157Alaska Airlines
Sat, Apr 25 - Sat, May 2
Southwest Logo
6:05 am - 2:10 pm
STS
-
ONT
8h 05m
2 stops
Southwest Logo
12:50 pm - 8:30 pm
ONT
-
STS
7h 40m
2 stops
$161Southwest
Fri, May 8 - Sat, May 16
Alaska Airlines Logo
10:41 am - 12:08 pm
STS
-
ONT
1h 27mnonstop
Alaska Airlines Logo
3:35 pm - 5:04 pm
ONT
-
STS
1h 29mnonstop
$167Alaska Airlines
Fri, Apr 24 - Sat, Apr 25
Alaska Airlines Logo
10:41 am - 12:08 pm
STS
-
ONT
1h 27mnonstop
Alaska Airlines Logo
12:48 pm - 2:20 pm
ONT
-
STS
1h 32mnonstop
$177Alaska Airlines
Booking Insights

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

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

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

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

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

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

If your flying dates are flexible, you should consider flying to Ontario on a Wednesday, 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 Santa Rosa to Ontario. For your return ticket, we recommend flying on a Thursday and avoiding Saturdays for the best deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Santa Rosa to Ontario, 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 Santa Rosa to Ontario is April, where tickets cost $190 (return) on average. On the other hand, the most expensive months are October and November, where the average cost of round-trip tickets is $756 and $732 respectively.

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

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 $277, prices are generally cheapest when you fly direct.

Good to know

Low seasonOctober
Cheapest flight$77
Best time to beat the crowds but there is an average 111% increase in price.
Most popular time to fly and prices are also 31% lower on average.
Flight from Santa Rosa to Ontario

When to book flights from Santa Rosa to Ontario

Are your dates flexible? Find out the best times to travel from Santa Rosa to Ontario 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 Santa Rosa to Ontario

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

    In the last 3 days, the lowest price for a flight from Santa Rosa to Ontario was $77 for a one-way ticket and $110 for a round-trip.

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

    No

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

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

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

    The Embraer 175 is the aircraft model that flies most regularly on the Santa Rosa to Ontario flight route.

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

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

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

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

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

    The two airlines most popular with KAYAK users for flights from Santa Rosa to Ontario are Alaska Airlines and American Airlines. With an average price for the route of $204 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 $296 and an overall rating of 7.1.

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

    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 Santa Rosa to Ontario.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Santa Rosa 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 Santa Rosa to Ontario?

    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 Ontario with an airline and back to Santa Rosa with another airline. Booking your flights between Santa Rosa and ONT 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 Santa Rosa to Ontario?

    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 Ontario from Santa Rosa 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 Santa Rosa to Ontario

  • Looking for a cheap flight? 25% of our users found flights on this route for $78 or less one-way and $177 or less round-trip.

Prefer to fly direct from Santa Rosa to Ontario?

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

Direct departures

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

Direct returns

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

Reviews of the top airlines flying from Santa Rosa to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Santa Rosa to Ontario. 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 Santa Rosa to Ontario? 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
8.5Crew
7.0Food
8.1Boarding
7.8Comfort
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.

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.

They cancelled the flight and provided no support to find another way home or how to get a refund. Links provided didn’t work and phone wait times were over eight hours. Battery on my phone couldn’t last long enough.

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.

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

I bought tickets MONTHS ago for a flight that left SAN at 14:30. That is what it says on our tickets. I was never notified of any time changes. During online check-in. I discovered the flight time had been changed to 15:45. This was unacceptable and had I been notified, I would have changed flights, or airlines. That departure time was unworkable with our plans. We called Alaska and asked for an explanation. They said flight time was changed 11/08/25. No proof of notification could be offered. We asked to be moved to an earlier flight. After much pleading, the rep said she would allow a “one time exception..” While I appreciate being moved, this was YOUR fault Alaska Airlines.

I love Alaska! We arrived on the later side without seat assignments only to find the had oversold the flight by 1. The attendants worked extra hard to find a way for our party of 7 to stay together and we made it on the flight! Loved the free WiFi also!

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.

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.

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.

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

Information on your arrival and departure airports