$34 Find Cheap Flights from Ontario to California

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 California departing on 2/5. 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 California

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to California.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to California.
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 24% 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.

Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Ontario to California

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Los Angeles
Los Angeles1 stop$128
San Francisco
San Francisco1 stop$128
San Diego
San Diego1 stop$113
San Jose
San Jose1 stop$145
Palm Springs
Palm Springs1 stop$364
Fresno
Fresno1 stop$183
San Luis Obispo
San Luis Obispo1 stop$239
Bakersfield
Bakersfield1 stop$486
Arcata
Arcata1 stop$265
Redding
Redding1 stop$244
Reno
Reno1 stop$144
Sacramento
Sacramento1 stop$129
Los Angeles
Los Angeles1 stop$128
San Francisco
San Francisco1 stop$128
San Diego
San Diego1 stop$113
San Jose
San Jose1 stop$145
Palm Springs
Palm Springs1 stop$364
Fresno
Fresno1 stop$183
San Luis Obispo
San Luis Obispo1 stop$239
Bakersfield
Bakersfield1 stop$486
Arcata
Arcata1 stop$265
Redding
Redding1 stop$244
Reno
Reno1 stop$144
Sacramento
Sacramento1 stop$129

Book Cheap Ontario to California Plane Tickets

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

Mon, Jan 26 - Fri, Jan 30
Frontier Logo
1:05 pm - 2:17 pm
ONT
-
LAS
1h 12mnonstop
Frontier Logo
6:45 pm - 7:53 pm
LAS
-
ONT
1h 08mnonstop
$59Frontier
Sat, Feb 21 - Wed, Feb 25
Frontier Logo
8:09 pm - 9:17 pm
ONT
-
LAS
1h 08mnonstop
Frontier Logo
12:41 pm - 1:52 pm
LAS
-
ONT
1h 11mnonstop
$60Frontier
Sat, Mar 28 - Sat, Apr 4
Alaska Airlines Logo
4:22 pm - 6:22 pm
ONT
-
STS
2h 00mnonstop
Alaska Airlines Logo
2:12 pm - 3:42 pm
STS
-
ONT
1h 30mnonstop
$167Alaska Airlines
Tue, Mar 10 - Sat, Mar 21
Alaska Airlines Logo
6:14 am - 9:52 pm
ONT
-
STS
15h 38m1 stop
Alaska Airlines Logo
2:12 pm - 3:42 pm
STS
-
ONT
1h 30mnonstop
$171Alaska Airlines
Thu, Jan 29 - Sun, Feb 1
American Airlines Logo
6:22 am - 12:25 pm
ONT
-
STS
6h 03m1 stop
American Airlines Logo
12:55 pm - 6:20 pm
STS
-
ONT
5h 25m1 stop
$177American Airlines
Sat, Mar 7 - Tue, Mar 10
United Airlines Logo
6:00 am - 10:19 am
ONT
-
SMF
4h 19m1 stop
United Airlines Logo
7:31 am - 12:18 pm
SMF
-
ONT
4h 47m1 stop
$198United Airlines
Wed, Jan 21 - Sun, Jan 25
American Airlines Logo
6:22 am - 12:25 pm
ONT
-
STS
6h 03m1 stop
American Airlines Logo
4:23 pm - 10:13 pm
STS
-
ONT
5h 50m1 stop
$207American Airlines
Fri, Feb 13 - Tue, Feb 17
Southwest Logo
9:20 pm - 10:45 pm
ONT
-
OAK
1h 25mnonstop
Southwest Logo
6:35 pm - 8:00 pm
OAK
-
ONT
1h 25mnonstop
$211Southwest
Fri, Feb 13 - Tue, Feb 17
Southwest Logo
9:20 pm - 10:45 pm
ONT
-
OAK
1h 25mnonstop
Southwest Logo
12:55 pm - 4:05 pm
OAK
-
ONT
3h 10m1 stop
$224Southwest
Tue, Mar 24 - Mon, Mar 30
United Airlines Logo
1:40 pm - 6:00 pm
ONT
-
MRY
4h 20m1 stop
United Airlines Logo
6:45 pm - 10:45 pm
MRY
-
ONT
4h 00m1 stop
$239United Airlines
Booking Insights

KAYAK's insights & trends for Ontario to California flights

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

What is the cheapest Ontario to California flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to California from Ontario found in the last 72 hours was to San Francisco, at $118 round-trip. The most popular route is from Ontario (ONT) to San Francisco (SFO), and the cheapest round-trip airline ticket found on this route in the last 72 hours was $118.

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

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 $317, prices are generally cheapest when you fly direct.

Good to know

Low seasonFebruary
Cheapest flight$34
Best time to beat the crowds with an average 9% drop in price.
Most popular time to fly and prices are also 29% lower on average.
Flight from Ontario to Las Vegas

FAQs - booking California flights

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

    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 California.

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

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

    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 from Ontario to California with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to California?

    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 from Ontario to California up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top tips for finding cheap flights to California

  • Looking for a cheap flight? 25% of our users found tickets from Ontario to the following destinations at these prices or less: Las Vegas $97 one-way - $99 round-trip; San Francisco $113 one-way - $234 round-trip; Sacramento $199 one-way - $249 round-trip

Reviews of the top 5 airlines serving from Ontario to California

 
See real verified KAYAK customer reviews for airlines flying from Ontario to California. 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 California? 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.
8.0
Alaska AirlinesOverall score based on 11634 reviews
7.8Comfort
7.1Food
8.5Crew
8.1Boarding
7.0Entertainment
Airline reviews

Did not have In flight service on my round trip due to turbulence. I did not partake in In flight entertainment. Flight descending into LAX was very turbulent. It would have been nice if the pilot communicated with us during that rough descent into LAX to ease the minds of some of us more nervous flyers.

8.0 ExcellentAnonymous, Jan 2026
SFO - LAX
Read more Alaska Airlines reviews

Did not have In flight service on my round trip due to turbulence. I did not partake in In flight entertainment. Flight descending into LAX was very turbulent. It would have been nice if the pilot communicated with us during that rough descent into LAX to ease the minds of some of us more nervous flyers.

They canceled my flight with only a couple hours before checking in at the airport and offered no alternatives to get home.

Was notified the departure would be late. Later on it was suddenly on time. Traffic by LAX was horrendous, and I missed the flight.

I wasn’t able to check in prior to arriving at the airport, I was told by the agent I may not get a seat on the plane as others were waiting for seats, I sat there for 2 hours before being assigned a seat, very stressful. The plane was delayed. Overall not a great travel experience for a 44 minute flight.

They changed our flight from a one stop 3 hour layover to a non-stop. Saved us hours and got us there sooner.

The ground crew did not supply drink or snacks during the layover in SFO. So there weren't many options. Otherwise, it was all great.

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

I was delayed several times. Missed a very important event. The airline only provided a $12 voucher after being delayed 3 times.

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.

This was likely the smallest, oldest plane I've been on. It didn't handle turbulence well and we were all jostled a lot more than I'm used to. At least it was a short flight.

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

The lead steward kept singing about "San Francisco" and hotel California---more annoying than humorous....needs work. Flight was smooth and on time.

Still a fan of open seating. Flight was on schedule and arrived on time. The 737 MAX is very comfortable.

San Diego airport is brand new, spacious, airy and very smooth checkin at SW baggage drop.

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

Delays delays delays. Late taking off, late landing, wait for a gate, etc.

Connecting flight is on time and boarding was a breeze!

Very smooth checking in our luggage with a super pleasant SW agent. I enjoyed a fun entertaining movie.

First time traveling on Southwest since bag fees were implemented. Usual good service. Just more expensive now.

It was a perfect flight in all aspects! Both legs!

Unbelievably poor service from flight attendants. They didn’t even do water service on a four hour flight. Just disrespectful.

Flight was late - I was downgraded from first class to coach

United needs to step up their game. Delayed flight leaving Seattle, San Francisco. Older aircraft, not very comfortable.

Plane boarded early a quickly, was mostly full. We left close to on time. And landed early.

7 hours delayed due to operational issues on United’s end. Basically laziness.

Flight was timely, relatively comfortable, with decent entertainment and food served. Only problem encountered was with the free messaging which I highly appreciate, but it did not work from iphone to non-iphones.

The internet service I paid for didn’t work at all and the flight crew was not very friendly.

Subject: Formal Complaint: Discriminatory and Unprofessional Conduct – Request for Immediate Action & Compensation Dear [Airline Customer Relations Team], I am writing to file a formal complaint regarding my recent travel experience with [Airline], which was by far the worst I have ever encountered. What occurred was not only unprofessional, but in several instances discriminatory, unsafe, and unacceptable. On the first leg of my trip, I arrived only four minutes past check-in. Instead of making any attempt to resolve the matter, your representative flatly denied me boarding and made me wait while she attended to passengers who arrived after me. By the time a manager intervened, it was too late to board, costing me time, money, and unnecessary frustration. The second leg of my trip (Chicago–San Francisco) raised even more serious concerns. From the outset, it was apparent that the staff—particularly two attendants—prioritized Caucasian passengers while dismissing African American and minority passengers. • When a Caucasian passenger in the exit row refused to comply with federal safety requirements, I, as a first responder, immediately offered to switch seats and assume the responsibility. My offer was blatantly ignored, and instead, a Caucasian passenger seated further up was chosen. This was discriminatory and deeply insulting, especially as I was actively de-escalating the situation that could have delayed the flight further. • During a lengthy tarmac delay of over 90 minutes, passengers were given conflicting and unreasonable instructions that created unnecessary distress and tension. • Throughout the flight, a visibly intoxicated passenger directly in front of me was disruptive, rude to others, failed to comply with seatbelt and electronic device rules, and yet faced no enforcement from the crew. In stark contrast, I was singled out for repeated compliance checks even though I was following every rule. This unequal treatment was so obvious that multiple passengers around me spoke up in my defense. This pattern of behavior demonstrated a clear lack of professionalism, disregard for passenger safety, and discriminatory treatment. I expect far better from an airline of your stature. As a paying customer subjected to this unacceptable treatment, I am formally requesting: 1. A full investigation into the conduct of the staff on both flights. 2. A written apology acknowledging the discriminatory and unprofessional behavior I endured. 3. Appropriate compensation for the distress, inconvenience, and mishandling of my travel. If this matter is not addressed promptly and thoroughly, I will have no choice but to escalate my complaint further, including filing with the U.S. Department of Transportation and sharing my experience through other channels. I trust [Airline] will take this complaint seriously and provide a timely resolution.

Check in was quick and easy during early hours. Flight was on time, and customer services was a plus.

The flight was comfortable with the exit row and great service

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.

We were told the flight was delayed 5 times, then it was moved to the next day.

The experience with American Airlines was good, although the Philippines Airlines flight was much better (better seats, better food, better entertainment options, overall better). Again, the MIA to LAX flight was fine, but nothing in comparison to the comfort and accommodations of the Philippines Airlines flight from LAX to MNL.

Loved the crew . Absolutely no complaints. Except for luggage lost

Wish some foods provided rather than just biscuit/cookie for flight more than 2 hours

We are too tired and frustrated to comment politely at this point

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.

It was ok. It was expensive to check 2 bags ($75.00 per bag), and then it took a long time to wait for shuttle to take us from one terminal to the terminal where the plane was taking off at LAX. And all of this for a flight where we had to pay for any food or drink that was not water.

When I wanted to check in 3 hours prior to boarding time, the employees mentioned “a little over an hour delay” so I waited for an hour then I went to go look for food in the terminal and most people from that flight were in the same area looking for food. Finally I decided after food to check to see if it’s anytime closer and now it’s 2 mins until boarding closes?! What are you kidding me? I didn’t receive anything via sms about boarding now nor via email or on the intercom. I luckily made it through, barely, and then there’s no room for my carry on mind you I’m in the very first row so I had to place my purse in one further row back and my carry on sections down. Not sure who pays for better seats to get your stuff placed all over the plane but that was the worst experience I’ve ever had flying with anyone.

Terrible. The canceled my entire flight when I requested a refund for a trip frontier canceled trip one way.

i was unable to check in the flight. refund requested

I think Frontier was very good at communication. Their app worked very well. Loading was great and the flight was nice and easy.

This airline sucks. They offer low rates then charge you for everything, the app does not work well, the seats are the most uncomfortable. Maintenance issues on the flight, and you still have to sit through their credit card commercials. People are nice enough but does not make up for overall poor experience.

Great for the price. No wifi or entertainment, but gate agents and crew were fantastic and we boarded quickly and left on time.

Decent clean onboard experience. Okay discount airline experience. Unfortunately, any customer service interactions are difficult and unhelpful. There is no service. Also, a premium seat only gets you premium boarding if you line up first. Once they start general boarding you must go to the back of the line. Not very premium

The crew was mostly okay. The flight attendant who answered our questions was curt and unhelpful unfortunately. He seemed upset and I understand having off days.

Very bad! No good service delayed my second connection flight

Everything you need to know for your flight from Ontario to California

Information on your arrival and departure airports