ONT - SJC

$49 Find Cheap Flights from Ontario to San Jose

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 San Jose departing on 9/18. 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 San Jose

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to San Jose, 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 San Jose, as well as popular online travel agencies
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Flights Deals

Cheap Flights from Ontario to San Jose (ONT-SJC)

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

Thu, Aug 14 - Mon, Aug 18
Southwest Logo
10:00 am - 11:15 amONT-SJC
1h 15mnonstop
Southwest Logo
11:05 am - 12:20 pmSJC-ONT
1h 15mnonstop
$97Southwest
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Thu, Aug 14 - Mon, Aug 18
Southwest Logo
7:55 pm - 9:05 pmONT-SJC
1h 10mnonstop
Southwest Logo
1:45 pm - 7:55 pmSJC-ONT
6h 10m1 stop
$107Southwest
Find Deal
Thu, Aug 14 - Mon, Aug 18
Southwest Logo
5:10 pm - 6:25 pmONT-SJC
1h 15mnonstop
Southwest Logo
3:25 pm - 10:00 pmSJC-ONT
6h 35m2 stops
$112Southwest
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Sat, Jul 26 - Mon, Jul 28
Frontier Logo
5:13 pm - 6:04 pmONT-SJC
24h 51m1 stop
Frontier Logo
2:12 pm - 4:20 pmSJC-ONT
26h 08m1 stop
$122Frontier
Find Deal
Sat, Aug 9 - Mon, Aug 11
Southwest Logo
3:45 pm - 5:00 pmONT-SJC
1h 15mnonstop
Southwest Logo
11:05 am - 12:20 pmSJC-ONT
1h 15mnonstop
$124Southwest
Find Deal
Fri, Aug 22 - Sun, Aug 31
Frontier Logo
6:00 am - 5:32 pmONT-SJC
11h 32m1 stop
Frontier Logo
6:27 pm - 8:52 pmSJC-ONT
26h 25m1 stop
$125Frontier
Find Deal
Sat, Aug 9 - Mon, Aug 11
Southwest Logo
5:25 am - 10:25 amONT-SJC
5h 00m1 stop
Southwest Logo
6:30 am - 7:55 amSJC-ONT
1h 25mnonstop
$134Southwest
Find Deal
Mon, Jul 28 - Mon, Aug 4
Frontier Logo
6:00 am - 1:17 pmONT-SJC
7h 17m1 stop
Frontier Logo
2:12 pm - 4:20 pmSJC-ONT
26h 08m1 stop
$138Frontier
Find Deal
Sat, Aug 9 - Mon, Aug 11
Southwest Logo
8:15 am - 9:30 amONT-SJC
1h 15mnonstop
Southwest Logo
3:25 pm - 10:00 pmSJC-ONT
6h 35m2 stops
$139Southwest
Find Deal
Wed, Aug 13 - Wed, Aug 20
American Airlines Logo
6:17 am - 6:27 pmONT-SJC
12h 10m1 stop
American Airlines Logo
6:00 am - 4:24 pmSJC-ONT
10h 24m1 stop
$223American Airlines
Find Deal
Expert advice

Expert advice for your flight from Ontario to San Jose

 
Snippets provided in this section are AI-generated based on a summarization of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airports
ONT

ONT offers streamlined security with average wait times of 6-15 minutes, making it ideal for quick departures, especially during peak hours.

Read more about ONTby Jennifer Simonson
SJC

For easy access to Silicon Valley, SJC offers convenient rideshare options directly at the arrivals curb, ideal for quick city transfers.

Our travel experts
Jennifer Simonson

Jennifer Simonson

Expert on ONT

Jennifer Simonson

Jennifer Simonson

Jennifer Simonson is driven by her lifelong commitment to exploring the globe. Her insatiable curiosity had led her to immerse herself into diverse locations like Oklahoma City and Pismo. Her hotel recommendations are the result of the myriad hotels she's stayed at across her travels. Along her journey, she cherishes engaging conversations with locals, indulging in the finest ice cream, trying her hand at surfing, and embarking on nature-filled hikes.

Read more
Bill Fink

Bill Fink

Expert on SJC

Bill Fink

Bill Fink

Bill is an award-winning travel writer with extensive credits covering airlines and the aviation industry for publications including AARP, AFAR, The Points Guy and Yahoo. Based in Portland, Oregon, Bill has traveled to more than 75 countries - and been late for his flight in most of them. He once achieved top-level frequent flier status for all of American, Delta and United Airlines during a single year.

Read more
Useful Info

KAYAK's insights & trends for Ontario to San Jose flights

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

Find cheap flights to San Jose
Find cheap flights to San Jose

Planning a trip from Ontario to San Jose? KAYAK’s data-powered insights will help you find cheap flights. Learn the best time to fly, how early to book your ticket, and other tips to secure great prices.

What’s the cheapest day of the week to fly from Ontario to San Jose?

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

If your flying dates are flexible, you should consider flying to San Jose on a Saturday, as we generally find the cheapest rates on that day for this route. On the other hand, Monday is the most expensive day to fly from Ontario to San Jose. For your return ticket, we recommend flying on a Tuesday and avoiding Sundays for the best deals.

What is the cheapest month to fly from Ontario to San Jose?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to San Jose, 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 San Jose is September, where tickets cost $164 (return) on average. On the other hand, the most expensive months are January and February, where the average cost of round-trip tickets is $282 and $259 respectively.

How far in advance should I book a flight from Ontario to San Jose?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Ontario to San Jose, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Ontario to San Jose, you should book around 4 weeks before departure. For the absolute cheapest price, our data suggests you should book 21 weeks before departure.

Good to know

Low seasonJanuary
High seasonOctober
Cheapest flight$49
Best time to beat the crowds but there is an average 24% increase in price.
Most popular time to fly with an average 10% increase in price.
Flight from Ontario to San Jose

When to book flights from Ontario to San Jose

Are your dates flexible? Find out the best times to travel from Ontario to San Jose 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 San Jose

  • What are some of my transportation options to get from the airport in San Jose to downtown San Jose?

    One of the best ways to get from the Norman Y. Mineta San Jose Interatniola Aiport (SJC) to the center of San Jose is aboard the line 60 bus operated by Santa Clara VTA that makes the trip in about 6 minutes.

  • If I plan on using a rideshare service when I arrive at the airport in San Jose, where should I pick up my ride?

    At Terminal A, all rideshare vehicles will meet their passengers at stop number one curbside at the adjacent parking garage. At Terminal B, they will do so at stops eight and nine on the ground transportation island.

  • Does the airport in San Jose have any hotels that are conveniently located next to the airport?

    One of the most suitable choices for a hotel that is right at the entrance to the airport on Skyport Dr. is the Sonesta Select San Jose Airport, which also offers a complimentary shuttle between the terminal building and the hotel.

  • Where will I find my rental car company if I plan on renting a car at the airport in San Jose?

    Every one of the 11 or so rental car companies that operate at this airport has a customer service desk in the rental car center of the airport. The rental car center sits directly across from Terminal B, and passengers arriving at Terminal B can walk across the crosswalk on Airport Boulevard to get to the center. If you arrive at Terminal A, take the airport blue shuttle bus to the rental car center.

  • What is the cheapest flight from Ontario to San Jose?

    In the last 3 days, the lowest price for a flight from Ontario to San Jose was $49 for a one-way ticket and $97 for a round-trip.

  • Do I need a passport to fly between Ontario and San Jose?

    No

  • Which airlines offer Wi-Fi service onboard planes from Ontario to San Jose?

    Delta, Alaska Airlines, Hawaiian Airlines, and American Airlines offer inflight Wi-Fi service on the Ontario to San Jose flight route.

  • Which aircraft models fly most regularly from Ontario to San Jose?

    The Boeing 737 MAX 8 is the aircraft model that flies most regularly on the Ontario to San Jose flight route.

  • On which days can I fly direct from Ontario to San Jose?

    There are nonstop flights from Ontario to San Jose on a daily basis.

  • Which is the best airline for flights from Ontario to San Jose, Southwest or Alaska Airlines?

    The two airlines most popular with KAYAK users for flights from Ontario to San Jose are Southwest and Alaska Airlines. With an average price for the route of $259 and an overall rating of 8.0, Southwest is the most popular choice. Alaska Airlines is also a great choice for the route, with an average price of $370 and an overall rating of 8.0.

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

    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 San Jose.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Jose 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 San Jose?

    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 San Jose with an airline and back to Ontario with another airline. Booking your flights between Ontario and SJC 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 San Jose?

    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 San Jose 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 San Jose

  • Looking for a cheap flight? 25% of our users found flights on this route for $139 or less one-way and $259 or less round-trip.
  • A very convenient and cost-effective way to get from the center of Ontario to the Ontario International Airport (ONT) is to take a ride on the line at 61 bus operated by Omnitrans, which makes the trip in about 11 minutes.
  • If you are flying with a pet or a service animal through the Ontario International Airport, you will find that this airport offers pet relief areas that they refer to as Barking Lots. There are two of these areas outside of the terminal buildings at each end of the terminal, and there are also indoor areas near gates 210 and 410.
  • Nursing mothers traveling by way of the Ontario International Airport will find that this airport has single-occupancy lactation rooms allowing mothers to nurse conveniently and privately. Each of the rooms features a padded bench, a changing area, and an electrical outlet and sits in close proximity to restrooms at the terminal. These rooms have locations adjacent to gates 207 and 407.
  • For travelers with disabilities or limited mobility traveling at the Ontario International Airport, the airport recommends these travelers arrive at least 2 hours before their flight. Some of the features that this airport offers for disabled passengers include the California Relay Service, which assists passengers that are deaf or hard of hearing, curb cuts to assist with getting from the street to the sidewalk, as well as elevators in all of the public areas of the airport.
  • When travelers are looking for a convenient and comfortable place to wait for their flight to San Jose at the Ontario International Airport, a good choice would be to use one of the two Aspire Lounge locations at the airport, with one in terminal two and the other terminal four. These lounges offer plenty of comfortable seating as well as food and beverage options and televisions for entertainment.

Prefer to fly direct from Ontario to San Jose?

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

Direct departures

Ontario to San Jose

Monday

Southwest

Southwest

Tuesday

Southwest

Southwest

Wednesday

Southwest

Southwest

Thursday

Southwest

Southwest

Friday

Southwest

Southwest

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights

Direct returns

San Jose to Ontario

Monday

Southwest

Southwest

Tuesday

Southwest

Southwest

Wednesday

Southwest

Southwest

Thursday

Southwest

Southwest

Friday

Southwest

Southwest

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights

Reviews of the top 5 airlines serving from Ontario to San Jose

 
See real verified KAYAK customer reviews for airlines flying from Ontario to San Jose. 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 San Jose? 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
7.1Food
7.8Comfort
8.1Boarding
8.5Crew
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.

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

Generally good. The aisles have gotten narrower which can slow down boarding. Flight crew was great! Healthier complimentary snacks would be appreciated. Due to earthquake in San Francisco we had to circle in air space for a bit but then had a smooth landing. I laud the flight crew for their patience ;)

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.

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