ONT - SJC

$75 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 1/21. 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 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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Everything you should know

Cheapest round-trip
$143
Overall average: $282
Frontier
Thu 1/15Sun 1/18
ONT - SJC • 1 stop
Cheapest non-stop
$181
Typical prices: $213-$299
Southwest
Wed 2/11Sat 2/14
ONT - SJC • Non-stop
Our travelers' advice
AI-generated summary based on content written by travel experts
ONT's streamlined security ensures quick departures.
SJC provides convenient rideshare for Silicon Valley access.
Expert advice
Expert advice
Expert advice
Expert advice
Video guide: How to find cheap flights to San Jose
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When to book
4 weeks
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 69% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
May
Cheapest • 24% price drop
April
Most popular
Good to know
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+1
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Flight 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, Jan 15 - Sun, Jan 18
Frontier Logo
10:18 pm - 6:37 pmONT-SJC
20h 19m1 stop
Frontier Logo
11:14 am - 3:39 pmSJC-ONT
4h 25m1 stop
$143Frontier
Find Deal
Thu, Jan 8 - Mon, Jan 12
American Airlines Logo
6:22 am - 12:10 pmONT-SJC
5h 48m1 stop
American Airlines Logo
12:50 pm - 6:20 pmSJC-ONT
5h 30m1 stop
$161American Airlines
Find Deal
Thu, Jan 15 - Sun, Jan 18
Frontier Logo
2:34 pm - 10:29 amONT-SJC
19h 55m2 stops
Frontier Logo
11:14 am - 5:44 pmSJC-ONT
6h 30m1 stop
$173Frontier
Find Deal
Thu, Jan 22 - Thu, Jan 29
Frontier Logo
8:48 pm - 8:40 amONT-SJC
11h 52m1 stop
Frontier Logo
4:06 pm - 7:53 pmSJC-ONT
27h 47m2 stops
$174Frontier
Find Deal
Wed, Feb 11 - Sat, Feb 14
Southwest Logo
4:40 pm - 6:00 pmONT-SJC
1h 20mnonstop
Southwest Logo
7:05 am - 8:20 amSJC-ONT
1h 15mnonstop
$181Southwest
Find Deal
Thu, Dec 25 - Tue, Dec 30
Frontier Logo
6:00 am - 6:48 pmONT-SJC
12h 48m1 stop
Frontier Logo
6:36 pm - 5:15 pmSJC-ONT
22h 39m1 stop
$187Frontier
Find Deal
Fri, Dec 12 - Sun, Jan 4
Frontier Logo
6:15 am - 7:13 pmONT-SJC
12h 58m1 stop
Frontier Logo
3:27 pm - 5:15 pmSJC-ONT
25h 48m1 stop
$188Frontier
Find Deal
Tue, Dec 16 - Thu, Dec 18
Southwest Logo
11:10 am - 12:25 pmONT-SJC
1h 15mnonstop
Southwest Logo
8:15 am - 12:30 pmSJC-ONT
4h 15m1 stop
$191Southwest
Find Deal
Thu, Jan 8 - Sat, Jan 10
Southwest Logo
12:10 pm - 1:30 pmONT-SJC
1h 20mnonstop
Southwest Logo
3:40 pm - 5:00 pmSJC-ONT
1h 20mnonstop
$193Southwest
Find Deal
Wed, Feb 11 - Sat, Feb 14
Southwest Logo
11:15 am - 6:30 pmONT-SJC
7h 15m2 stops
Southwest Logo
7:05 am - 8:20 amSJC-ONT
1h 15mnonstop
$196Southwest
Find Deal
Booking Insights

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 Monday and avoiding Wednesdays 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 May, where tickets cost $187 (return) on average. On the other hand, the most expensive months are November and January, where the average cost of round-trip tickets is $289 and $282 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, which saves you about 69% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 9 weeks before departure.

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.

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

Good to know

Low seasonJanuary
Cheapest flight$75
Best time to beat the crowds but there is an average 14% increase in price.
Most popular time to fly and prices are also 18% lower on average.
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 $75 for a one-way ticket and $143 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, JetBlue, 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 737-700 Passenger/BBJ1 (winglets) is the aircraft model that flies most regularly on the Ontario to San Jose flight route.

  • Which airline alliances offer flights from Ontario to San Jose?

    Star Alliance is the only airline alliance operating flights between Ontario and San Jose.

  • 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 United Airlines?

    The two airlines most popular with KAYAK users for flights from Ontario to San Jose are Southwest and United Airlines. With an average price for the route of $260 and an overall rating of 8.0, Southwest is the most popular choice. United Airlines is also a great choice for the route, with an average price of $187 and an overall rating of 7.4.

  • 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 $263 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 3 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
SouthwestOverall score based on 4252 reviews
8.1Boarding
7.5Entertainment
8.0Comfort
8.6Crew
7.0Food
Airline reviews

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

10.0 ExcellentGordon, Nov 2025SAN - OAK
Read more Southwest reviews

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!

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.

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

Plane was crowded and even when we hit altitude, the plane was hot, not enough air flow.

1. when we went to check in, our 2 first class seats had been CANCELED and the flight was sold out. This was done without our prior knowledge. It was all we could do to restore one first class seat for my wife and I flew economy. 2, Our flight home was scheduled to leave at 10:30 pm. Due to tsunami warnings, the roads were closed and our flight status was uncertain as to whether it would leave as scheduled. It was announced that it would now leave at 11:20 pm and the roads were now open since the tsunami had come and gone. We made a mad dash to the airport and checked in. Delays were announced at 12:30 pm, 1:30 am, 2:30 am and at 3:30 am it was canceled. Since this was a flight due to natural (tsunami) causes, there was no compensation. We were told to return at 1:00 pm the next day and our baggage would be kept on the plane since the same plane was going to leave at 1:00 pm. We had to return to our hotel for the rest of the night. The same plane did not leave at 1:00 pm and our baggage was gone! All in all, it was a miserable performance by UA. Information was hard to obtain and no one knew what was going on and what was going to happen. Hundreds of passengers slept on the floor, chairs, etc. No food and no water was made available to the passengers. It was a situation where UA could care less what was going on. As a one million mile flyer, I had not experienced anything like this before and it was hugely disappointing!

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

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

Everything you need to know for your flight from Ontario to San Jose

Other airlines flying from Ontario to San Jose

Flights from the other most popular airlines that fly from Ontario to San Jose according to KAYAK users. Prices are the lowest found on KAYAK over the last 7 days. Price and availability are not guaranteed.