$29 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 7/16. 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 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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Best California Flight Deals from Ontario

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Los Angeles
Los Angeles1 stop$487
San Francisco
San Franciscononstop$38
San Diego
San Diego1 stop$133
San Jose
San Josenonstop$97
Palm Springs
Palm Springs1 stop$225
Fresno
Fresno1 stop$198
San Luis Obispo
San Luis Obispo1 stop$284
Bakersfield
Bakersfield1 stop$415
Arcata
Arcata1 stop$314
Redding
Redding1 stop$226
Reno
Reno1 stop$154
Sacramento
Sacramentononstop$137
Los Angeles
Los Angeles1 stop$487
San Francisco
San Franciscononstop$38
San Diego
San Diego1 stop$133
San Jose
San Josenonstop$97
Palm Springs
Palm Springs1 stop$225
Fresno
Fresno1 stop$198
San Luis Obispo
San Luis Obispo1 stop$284
Bakersfield
Bakersfield1 stop$415
Arcata
Arcata1 stop$314
Redding
Redding1 stop$226
Reno
Reno1 stop$154
Sacramento
Sacramentononstop$137

Cheap Flights from Ontario to California

 
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, Jul 21 - Mon, Jul 28
Frontier Logo
9:41 pm - 11:14 pmONT-SFO
1h 33mnonstop
Frontier Logo
10:11 pm - 11:40 pmSFO-ONT
1h 29mnonstop
$38Frontier
Find Deal
Mon, Jul 21 - Mon, Jul 28
Frontier Logo
9:41 pm - 11:14 pmONT-SFO
1h 33mnonstop
Frontier Logo
10:11 pm - 11:40 pmSFO-ONT
1h 29mnonstop
$45Frontier
Find Deal
Tue, Jul 29 - Tue, Jul 29
United Airlines Logo
6:39 pm - 8:06 pmONT-SFO
1h 27mnonstop
United Airlines Logo
9:25 pm - 10:52 pmSFO-ONT
1h 27mnonstop
$52United Airlines
Find Deal
Mon, Jul 21 - Thu, Jul 24
United Airlines Logo
6:39 pm - 8:06 pmONT-SFO
1h 27mnonstop
United Airlines Logo
9:25 pm - 10:52 pmSFO-ONT
1h 27mnonstop
$57United Airlines
Find Deal
Mon, Aug 11 - Wed, Aug 13
Southwest Logo
6:20 pm - 7:40 pmONT-OAK
1h 20mnonstop
Southwest Logo
4:15 pm - 5:35 pmOAK-ONT
1h 20mnonstop
$97Southwest
Find Deal
Tue, Aug 12 - Tue, Aug 12
Southwest Logo
1:55 pm - 3:10 pmONT-SJC
1h 15mnonstop
Southwest Logo
6:30 pm - 7:50 pmSJC-ONT
1h 20mnonstop
$97Southwest
Find Deal
Sat, Aug 30 - Wed, Sep 10
American Airlines Logo
12:22 pm - 7:38 pmONT-SAN
7h 16m1 stop
American Airlines Logo
4:40 pm - 6:12 pmSAN-ONT
25h 32m1 stop
$230American Airlines
Find Deal
Wed, Jul 23 - Sat, Jul 26
Alaska Airlines Logo
6:00 am - 12:52 pmONT-MFR
6h 52m1 stop
Alaska Airlines Logo
6:14 pm - 12:15 amMFR-ONT
6h 01m1 stop
$238Alaska Airlines
Find Deal
Thu, Aug 7 - Tue, Aug 12
Alaska Airlines Logo
6:58 pm - 12:10 amONT-MFR
5h 12m1 stop
Alaska Airlines Logo
12:00 pm - 6:04 pmMFR-ONT
6h 04m1 stop
$240Alaska Airlines
Find Deal
Fri, Oct 3 - Mon, Oct 6
American Airlines Logo
1:10 pm - 7:16 pmONT-MFR
6h 06m1 stop
American Airlines Logo
2:02 pm - 6:52 pmMFR-ONT
4h 50m1 stop
$243American Airlines
Find Deal
Useful Info

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?

The cheapest price for flight routes found by users searching on KAYAK in the last 2 weeks for round-trip flights from Ontario to California.

The cheapest ticket to California from Ontario found in the last 72 hours was to San Francisco, at $57 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 $57.

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 $320, prices are generally cheapest when you fly direct.


Good to know

Low seasonJanuary
High seasonAugust
Cheapest flight$29
Best time to beat the crowds but there is an average 15% increase in price.
Most popular time to fly and prices are also 17% 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 $88 one-way - $145 round-trip; San Francisco $69 one-way - $109 round-trip; Sacramento $149 one-way - $259 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 10000 reviews
7.8Comfort
7.1Food
8.5Crew
8.1Boarding
7.1Entertainment
Airline reviews

Big delay of over 7 hours on next leg of trip with Alaska. Would have been nice to have food or something

10.0 ExcellentAnonymous, Jun 2025SFO - SAN
Read more Alaska Airlines reviews

Big delay of over 7 hours on next leg of trip with Alaska. Would have been nice to have food or something

It was my first time flying Alaska Airlines and first time flying from Santa Rosa airport. The staff was very professional and friendly. Their instructions were clear and any question was answered satisfactorily. My seat was comfortable and the in-flight beverage service very adequate for the duration of the flight. We arrived ahead of the scheduled landing time and deplaning was simple. I look forward to flying with Alaska again.

Flight attendant took my carefully folded coat and flung it across the aisle to the bin across the way. Where one of the passengers rescued it for me, because that just wasn’t right!!

First time flying with any airline that has decent seating. Great experience crew was friendly and the pilot was as well.

the flight was delayed twice and then delayed from taking off.

I’m New to Alaska Airlines. I was not able to connect to WiFi on either leg of my flights to/from Santa Rosa. Otherwise, it was an enjoyable ride.

Didn’t like anything. Alaska boarding process takes too long and is poorly managed. Flight crew unorganized and too lax not very professional. I fly very frequently (weekly) and this as the worst overall trip I have ever taken.

All good. Great food and entertainment when there isn’t any on a one hour flight

Flight was delayed twice, I was forced to check my bag, and the only offered water or apple juice on the flight

The flight was delayed over two and a half hours thus causing me to miss my best friend’s funeral. All because the flight crew had to get more rest. That was the reason stated. I understand however very unfortunate. Glad everyone is well rested and resting in peace.

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!

Boarding process, crew were good. But the seats were so uncomfortable that was all I could focus on. I literally had to sit forward so that all 3 of us could fit in row. I will try to avoid Southwest in the future for any flights over 60 minutes.

Great flight, 47 passengers on a 180 seat plane. Stewardess was pleasant and cheerful.

Great experience flying Southwest. The crew was really kind and helpful, and very friendly with our toddler.

Plane late from DC to Austin 30 minutes. Crew made up much of the time enroute to San Diego.

Fine, but how to board on SW versus othrr airlines, is just lame. Goood staff though and all was solid otherwise.

Was as expected. Crowed planes. Too many carryons delaying takeoff. But the ride only took an hour and saved me a lot of time SFO is a not a great airport.

Was as expected. Crowed planes. Too many carryons delaying takeoff. But the ride only took an hour and saved me a lot of time SFO is a hell hole of an airport. It is the new LaGuardia. Everything Cobbled together. Security gates closed. Terri directional signage

I will be flying again Southwest Airlines. Friendly crew, comfortable and affordable.

Boarded plane and then delayed 1.5 hours while on the plane

Horrific. They missed my connecting flight to San Diego. I didn’t get there until Monday at 9am when I had a mandatory court settlement conference scheduled at 6am since we had parties on the east coast. This caused many issues. All because United apparently forgot to hold the doors open until my flight landed that only had a 10 minute delay. This was the last flight to Southern California. So I couldn’t even rent a car to finish the trip. United cannot be trusted when traveling on specific days and times since weather didn’t have anything to do with the delays.

My flight was delayed a very short period of time but they did not hold my connecting flight to San Diego, also through United. So they closed the doors before we got off our plane. They would only have to help the door open for another five to ten minutes. So I missed a court deadline for a manditory mediation settlement conference for my client. I had to get an associate to be there in person and be on the phone with him relaying what he needs to do the entire time. The court was very upset with me and so was my client. United cannot be trusted.

We were given vouchers we couldn’t use with a 5.5 hour delay

Really good 😊 the woman at the gate entrance was a little rude checking in our carry-on but i dont think she worked for the airline, she worked for the airport at sacramento, other than that amazing.

Boarding was mayhem. Late boarding by 15 minutes because of lack of staff (missing 1 flight attendant. We had to wait for an arrival of another plane before we could board). Flight was a little rough, but cannot blame on airlines.

Great experience…left a bit behind schedule but made up fir that in the air and landed 10 minutes early 😁

United out of SFO is having issues with catering so none of our meals were loaded on the plane and no offer of compensation for our tickets purchased was offered.

A bit rush for transit. Food and entertainment are not available

The gate was too far away for the connecting flight

Boarding was a breeze, however, two of the flights that I boarded with Spirit did not have Wi-Fi available.

Very good. Nothing more or less than expected. No complaints.

My experience with the spirit as a first time it was OK, but the seats need a little cushion, the problem I had the most impacted me was when checking in the scales were so off and wrong. It will tell that you would have more weight, which was not true. The scale was say that it had Thirty Eight Pounds, when get in the labels when we send the luggage into the band. It says that it was overweight. I really really dislike that because the scales are not accurate. If I use Spirit and I have that issue again. That will be my last time flying with the spirit, even though I like so much to service the planes, and everything else

hahaha we are delayed for one hour plus.. but thx we arrived San Diego safe

Worst airline ever! The guy weighing my bag had his foot on the metal plate and when I called him out on it, I got this stupid little smirk. La is a scam and so is Spirit Airlines. All the flight attendants looked like they hated our flight just as much as we did.

Unclear pricing; ended up being charged an extra $52 just to get onboard

Spirit is awful. Too expensive for what you get. Stop nickel and diming.

would be great to get basic water, soda at least and stop charging for carry ons

Your crew is a representation of your Standards and Values. The crew from Seattle to LAX, was very disappointing. The crew was more interested in hanging out at the lobby area. Talking, laughing loudly and eating all the snacks. They did not do regular rounds to see if customers needed anything. This was a huge disappointment. I will no longer be flying with your airlines moving forward.

- flight attendants not very friendly. - Paid for WiFi and plane didn’t have it working , never got a refund.

Very bad! No good service delayed my second connection flight

They canceled flight. Hard to believe there was even a plane incoming for us to get on

Cancelled flight after I arrived at airport after 75 min drive and parking. Next flight was 4 days in the future. Had to scramble and buy a much more expensive flight on another carrier.

I liked the turn-style feature at gate 209B at LAX. Very efficient process. The gate staff also made several, clearly directed announcements so I felt very informed.

Plane was down graded and I lost my uncharged exit row with more leg room. No mention or offer of refund from podium. Flight attendant was nice to explain this happens often and that I could request a refund via online form submission. I did this and have heard nothing back.

Horrendous. I do not recommend Frontier. The passengers lack manners and decency, and the flight attendants lack professionalism. If I wasn’t in a bind to fly with 48 hours notice for a job interview, I would not have selected a flight with Frontier and I never plan to fly with them in the future.

The seats were hard molded plastic covered in plastic vinyl. And the scam to charge people extra to sit together. Don’t they know we can just ask someone to trade seats. And watching the staff separate young children from parents… super classy. We had to guilt them into offering up our seats. This companies policies suck. Don’t give them your money.

The seats were awful, hard plastic covered in sheet vinyl. The airline tries to scam you into paying extra to get seat together when the flight wasn’t full. They were going to separate a family with young children but my wife who had a row to herself gave up her seat so the young mom could be with her young boys. I’m never giving this airline my money again.

It was a short flight so no food or entertainment….

Frontier had yet another flight cancellation. Have never made a complete round trip with this airline without at least one leg getting cancelled. Miserable flights - dirty, uncomfortable planes that apparently always have issues since I've had multiple delays and cancellations with them.

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

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