$44 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 5/27. 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.
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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 Franciscononstop$105
San Diego
San Diego1 stop$124
San Jose
San Josenonstop$137
Palm Springs
Palm Springs1 stop$408
Fresno
Fresno1 stop$168
San Luis Obispo
San Luis Obispo1 stop$279
Bakersfield
Bakersfield1 stop$514
Arcata
Arcata1 stop$250
Redding
Redding1 stop$342
Reno
Reno1 stop$167
Sacramento
Sacramento1 stop$197
Los Angeles
Los Angeles1 stop$128
San Francisco
San Franciscononstop$105
San Diego
San Diego1 stop$124
San Jose
San Josenonstop$137
Palm Springs
Palm Springs1 stop$408
Fresno
Fresno1 stop$168
San Luis Obispo
San Luis Obispo1 stop$279
Bakersfield
Bakersfield1 stop$514
Arcata
Arcata1 stop$250
Redding
Redding1 stop$342
Reno
Reno1 stop$167
Sacramento
Sacramento1 stop$197

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

Tue, Aug 11 - Thu, Aug 13
Frontier Logo
1:28 pm - 2:39 pm
ONT
-
LAS
1h 11mnonstop
Frontier Logo
6:46 pm - 7:53 pm
LAS
-
ONT
1h 07mnonstop
$73Frontier
Sat, May 30 - Mon, Jun 1
Frontier Logo
3:30 pm - 4:43 pm
ONT
-
LAS
1h 13mnonstop
Frontier Logo
1:59 pm - 3:09 pm
LAS
-
ONT
1h 10mnonstop
$75Frontier
Tue, Jun 16 - Tue, Jun 23
Southwest Logo
6:10 am - 7:25 am
ONT
-
SJC
1h 15mnonstop
Southwest Logo
8:55 pm - 10:10 pm
SJC
-
ONT
1h 15mnonstop
$137Southwest
Tue, May 26 - Sat, May 30
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
Tue, Jun 2 - Wed, Jun 10
Southwest Logo
5:45 am - 7:00 am
ONT
-
SJC
1h 15mnonstop
Southwest Logo
6:20 pm - 11:00 pm
SJC
-
ONT
4h 40m
1 stop
$147Southwest
Thu, May 28 - Sat, May 30
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
Mon, Jun 1 - Mon, Jun 8
Multiple Airlines Logo
3:30 pm - 1:15 pm
ONT
-
FAT
21h 45m
1 stop
Multiple Airlines Logo
3:31 pm - 7:32 pm
FAT
-
ONT
4h 01m
1 stop
$168Multiple Airlines
Thu, May 28 - Thu, Jun 4
Multiple Airlines Logo
11:51 am - 2:47 pm
ONT
-
FAT
26h 56m
1 stop
Multiple Airlines Logo
3:31 pm - 7:32 pm
FAT
-
ONT
4h 01m
1 stop
$173Multiple Airlines
Wed, Jun 10 - Tue, Jun 16
United Airlines Logo
1:50 pm - 8:07 pm
ONT
-
ACV
6h 17m
1 stop
United Airlines Logo
6:00 am - 12:12 pm
ACV
-
ONT
6h 12m
1 stop
$304United Airlines
Mon, Jun 1 - Mon, Jun 8
United Airlines Logo
1:50 pm - 6:02 pm
ONT
-
ACV
4h 12m
1 stop
United Airlines Logo
6:44 pm - 10:37 pm
ACV
-
ONT
3h 53m
1 stop
$344United 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 $93 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 $93.

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 $285, prices are generally cheapest when you fly direct.

What is the cheapest month to fly from Ontario to California?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to California, 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 California is August, when tickets cost $31 (return) on average. On the other hand, the most expensive months are April and June, when the average cost of round-trip tickets is $702 and $624 respectively.

Good to know

Low seasonJanuary
Cheapest flight$65
Best time to beat the crowds but there is an average 41% increase in price.
Most popular time to fly and prices are also 32% 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 $123 one-way - $158 round-trip; San Francisco $90 one-way - $192 round-trip; Sacramento $149 one-way - $244 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.
7.9
Alaska AirlinesOverall score based on 12331 reviews
8.1Boarding
7.8Comfort
8.5Crew
7.0Entertainment
7.1Food
Airline reviews

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!

10.0 ExcellentMary Kay, Apr 2026
STS - PSP
Read more Alaska Airlines reviews

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.

It was ok! Not fond of sitting in middle seat. Tried to upgrade with my Atmos card but it was a new account and they weren’t able to look up my account details.

Four hour delay. Missed our event. And they offered me $75. Absolutely shameful.

Not having a five hour delay with little notice! The crew was very kind, though, and just as tired as we passengers were. The flight didn't depart until nearly 1 am...and no reason was ever given.

This leg was much better, but we did have to have a 3 hour lay o er after coming from a very exhausting hiccup with our flight from BNA to Den

The Air hostess were very rude on my flight from Houston to Austin . Their regular communication itself felt a they are shouting at people.

Boarding was easy. The seats are small and fairly uncomfortable

The problem with the seat assignments is that there were a lot of rows in the front that were empty but my row at the back was full. Just not so pleasant.

No food or entertainment, just a quick 40 minute flight. A little bumpy due to Santa Ana winds but pilot has no control over that. Good flight and landing!

Good but I prefer choose your own seat. With the new assigned seats they should board from the back I see no advantage to this new boarding. Just like every other airline

Mediocre. Boarding is now unpleasant. The employees, once friendly and nice, are now regularly speaking sternly to passengers, badgering them to do things right so they can take off on time and gate check bags because they don't have enough overhead bin space. The pretzel snack was crushed flat and broken into even smaller pieces, which happens frequently lately. Drink service was suspended before they reached my row.

The charges were ridiculous for an hour flight and the turbulence was very scary.

3 hour delay. Had to change plans and was still delayed.

Outstanding service, efficient & friendly crew, flight was safe, comfortable & on time

The crew was great. Very friendly and responsive. The plane was old, small and tight. We ran out of overhead space and I had to check. Middle seat was particularly tight.

The flight was delayed from take off because only one runway was operational in San Francisco.

Several missed and almost missed connections. It felt like everything was being patched together last minute without enough resources and it ended up being an extremely stressful experience that basically ruined our weekend on the west coast. What a waste.

Packed in plane small uncomfortable seats elbow to elbow nobody wants to be in that situation for the money they paid

Checking in united could not figure out my star alliance gold. Baggage did not get marked priority and didn't receive boarding passes. When got to SFO lounge personal fixed everything Immediately

Flight left on time, arrived early, pleasant staff provided water, coffee, etc. access to bathrooms was reasonable and were well maintained. blankets were available, lots of entertainment options. LUGGAGE SERVICE WAS GREAT. I got my one checked bag quickly and was able to make a bus connection for a 2 hour bus ride saving me from waiting another 1.5 hours.

Terrible, if possible won't be flying again anytime soon!

Wonderful in-seat entertainment with seatback screens and huge selection of quality movies. The ability to bluetooth connect headphones was amazing.

Horrible service no Wi-Fi connection on both leg of the flight and they are refusing to fix bad service

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.

They didn’t offer a water, even after I asked

Remind customers of the need to have passport or new ID for boarding.

The flight never took off and we spent 7 hours at the airport

Our flight was canceled. I will never use Kayak nor Frontier for travel again. The entire experience was a headache.

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.

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

Information on your arrival and departure airports