ONT - SJC

$59 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 5/20. 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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41.299.237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$117
Typical prices: $329-$179
Southwest
Tue 5/19Wed 5/20
ONT - SJC • Non-stop
Cheapest one-way
$59
Typical prices: $88-$247
Southwest
Wed 5/20
ONT - SJC • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
ONT's streamlined security ensures quick departures.
SJC provides convenient rideshare for Silicon Valley access.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Cheapest • from $117 (round-trip)
Best reviews • 8.0 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
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Nonstop flights
You can fly direct with Southwest. Average duration is 1h 14m
Direct flights
Direct flights
+1
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Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $194 (round-trip)
Shortest trip • 5h 32m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 66% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 29% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
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Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to San Jose!
Flight Deals
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Expert advice
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

Tue, May 19 - Wed, May 20
Southwest Logo
5:45 am - 7:00 am
ONT
-
SJC
1h 15mnonstop
Southwest Logo
12:30 pm - 1:45 pm
SJC
-
ONT
1h 15mnonstop
$117Southwest
Tue, May 19 - Wed, May 20
Southwest Logo
5:45 am - 7:00 am
ONT
-
SJC
1h 15mnonstop
Southwest Logo
6:15 am - 9:50 am
SJC
-
ONT
3h 35m
1 stop
$127Southwest
Tue, May 19 - Wed, May 20
Southwest Logo
5:45 am - 7:00 am
ONT
-
SJC
1h 15mnonstop
Southwest Logo
1:45 pm - 6:55 pm
SJC
-
ONT
5h 10m
2 stops
$132Southwest
Wed, May 20 - Wed, May 27
Southwest Logo
2:10 pm - 8:30 pm
ONT
-
SJC
6h 20m
1 stop
Southwest Logo
5:55 pm - 9:45 pm
SJC
-
ONT
3h 50m
1 stop
$137Southwest
Fri, May 8 - Sun, May 10
Frontier Logo
8:44 am - 1:17 pm
ONT
-
SJC
4h 33m
1 stop
Frontier Logo
2:12 pm - 7:49 am
SJC
-
ONT
17h 37m
1 stop
$140Frontier
Wed, May 6 - Tue, May 12
Southwest Logo
12:40 pm - 8:30 pm
ONT
-
SJC
7h 50m
2 stops
Southwest Logo
6:15 am - 11:35 am
SJC
-
ONT
5h 20m
1 stop
$142Southwest
Tue, Jun 2 - Thu, Jun 4
Southwest Logo
12:30 pm - 1:45 pm
ONT
-
SJC
1h 15mnonstop
Southwest Logo
4:40 pm - 6:00 pm
SJC
-
ONT
1h 20mnonstop
$147Southwest
Tue, May 19 - Wed, May 20
Southwest Logo
9:45 pm - 7:05 am
ONT
-
SJC
9h 20m
1 stop
Southwest Logo
1:45 pm - 6:55 pm
SJC
-
ONT
5h 10m
2 stops
$148Southwest
Thu, Apr 30 - Sun, May 3
Frontier Logo
11:47 am - 6:12 pm
ONT
-
SJC
6h 25m
1 stop
Frontier Logo
8:19 pm - 8:04 pm
SJC
-
ONT
23h 45m
1 stop
$150Frontier
Thu, Apr 30 - Mon, May 4
Frontier Logo
11:47 am - 6:12 pm
ONT
-
SJC
6h 25m
1 stop
Frontier Logo
8:22 pm - 3:44 pm
SJC
-
ONT
19h 22m
1 stop
$151Frontier
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.

How much is a round-trip flight from Ontario to San Jose, California?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Ontario to San Jose, California departing in May.

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 Thursday and avoiding Tuesdays 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 $216 (return) on average. On the other hand, the most expensive months are March and January, where the average cost of round-trip tickets is $545 and $439 respectively.

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

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.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $353 on average.

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 66% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 17 weeks before departure.

Expert advice

Expert advice for your flight from Ontario to San Jose

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Jennifer Simonson

Jennifer Simonson

Expert on ONT

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.

Bill Fink

Bill Fink

Expert on SJC

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.

Good to know

Low seasonFebruary
Cheapest flight$59
Best time to beat the crowds but there is an average 7% increase in price.
Most popular time to fly and prices are also 30% 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 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 $59 for a one-way ticket and $117 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, and Hawaiian 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.

  • 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 $302 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 $78 or less one-way and $276 or less round-trip.

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 4338 reviews
8.1Boarding
8.0Comfort
7.5Entertainment
8.6Crew
7.0Food
Airline reviews

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

4.0 Okaysangeetha, Apr 2026
AUS - SJC
Read more Southwest reviews

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.

The flight crew was extremely rude and especially not helpful when our flight was delayed.

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.

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

I will never fly ANA again. They lost one of my large pieces of checked luggage, the heaviest one with the most valuable items in it, and they said they will not send me an email unless they can't find it, even though the paper they gave me to track the status of my lost luggage requires a code from an email they are supposed to send me so I can do baggage tracing. They claim to be an international airline, but they also insist on calling a Japanese telephone number to confirm where to send the lost baggage if they find it. It is impossible to find an actual contact email address for customer support on their website, and their AI chatbot is unhelpful, directing you to a webpage that says it is for contact information but does not have any actual email addresses or phone numbers listed on it. My seat in economy did not recline at all, even though I was not sitting in an exit row nor the very back row. I had to sit in the fully upright position for over ten hours of international travel. Awful experience overall.

Flight delayed for more than 16 hrs and no effort was spent to provide an alternate

Overall we had a good experience during our flight from San Francisco to Houston.

it was a very short flight so my expectations were low.

Very disappointing given gate agent behavior. Filed a formal complaint with United.

Flight delayed. WiFi connectivity very poor if not existant. Last minute arrival forced me to run to catch my connection.

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.

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

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.