SJO - ONT

$158 Find Cheap Flights from San José to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from San José to Ontario departing on 1/26. 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 Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San José to Ontario, 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 San José to Ontario, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$269
Overall average: $474
United Airlines
Thu 2/26Sun 3/8
SJO - ONT • 1 stop
Cheapest one-way
$158
Typical prices: $206-$342
United Airlines
Mon 1/26
SJO - ONT • 1 stop
When to travel
October
Cheapest • 13% price drop
December
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Ontario!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from San José to Ontario (SJO-ONT)

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

Thu, Feb 26 - Sun, Mar 8
United Airlines Logo
9:40 am - 10:57 pm
SJO
-
ONT
15h 17m1 stop
United Airlines Logo
11:59 pm - 11:56 am
ONT
-
SJO
10h 57m1 stop
$269United Airlines
Wed, Apr 22 - Wed, Apr 29
United Airlines Logo
8:45 am - 10:45 pm
SJO
-
ONT
15h 00m1 stop
United Airlines Logo
11:05 am - 7:15 am
ONT
-
SJO
19h 10m1 stop
$280United Airlines
Tue, Jan 27 - Mon, Feb 2
Multiple Airlines Logo
9:40 am - 5:43 pm
SJO
-
ONT
10h 03m1 stop
Multiple Airlines Logo
6:00 am - 8:32 am
ONT
-
SJO
24h 32m1 stop
$287Multiple Airlines
Fri, May 1 - Fri, May 15
United Airlines Logo
8:45 am - 10:52 pm
SJO
-
ONT
15h 07m1 stop
United Airlines Logo
1:28 pm - 7:15 am
ONT
-
SJO
16h 47m1 stop
$289United Airlines
Fri, May 1 - Fri, May 15
United Airlines Logo
7:55 am - 5:47 pm
SJO
-
ONT
34h 52m2 stops
United Airlines Logo
1:28 pm - 7:15 am
ONT
-
SJO
16h 47m1 stop
$299United Airlines
Fri, May 1 - Fri, May 15
United Airlines Logo
7:55 am - 9:01 pm
SJO
-
ONT
38h 06m2 stops
United Airlines Logo
11:05 am - 7:15 am
ONT
-
SJO
19h 10m1 stop
$300United Airlines
Fri, May 1 - Sun, May 3
United Airlines Logo
8:45 am - 10:52 pm
SJO
-
ONT
15h 07m1 stop
United Airlines Logo
6:00 am - 7:15 am
ONT
-
SJO
24h 15m1 stop
$301United Airlines
Sun, Feb 1 - Fri, Feb 6
Multiple Airlines Logo
6:30 am - 11:18 am
SJO
-
ONT
30h 48m1 stop
Multiple Airlines Logo
6:00 am - 8:32 am
ONT
-
SJO
24h 32m1 stop
$310Multiple Airlines
Wed, Mar 4 - Tue, Mar 10
United Airlines Logo
12:35 pm - 9:59 pm
SJO
-
ONT
11h 24m1 stop
United Airlines Logo
11:59 pm - 11:56 am
ONT
-
SJO
10h 57m1 stop
$322United Airlines
Thu, Feb 26 - Sat, Feb 28
United Airlines Logo
9:40 am - 10:57 pm
SJO
-
ONT
15h 17m1 stop
United Airlines Logo
1:53 pm - 8:32 am
ONT
-
SJO
16h 39m1 stop
$331United Airlines
Booking Insights

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

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

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from San José to Ontario, 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 San José to Ontario is October, where tickets cost $368 (return) on average. On the other hand, the most expensive months are April and June, where the average cost of round-trip tickets is $521 and $493 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from San José to Ontario, 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 San José to Ontario, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 6 weeks before departure.

Find deals

Good to know

Low seasonJanuary
Cheapest flight$158
Best time to beat the crowds but there is an average 8% increase in price.
Most popular time to fly with an average 1% increase in price.
Flight from San José to Ontario

When to book flights from San José to Ontario

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

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

    In the last 3 days, the lowest price for a flight from San José to Ontario was $158 for a one-way ticket and $269 for a round-trip.

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

    Yes, you'll most likely have to show a valid passport before boarding the plane in San José and on arrival in Ontario.

  • Which airports will I be using when flying from San José to Ontario?

    San José airport is called San José Juan Santamaria Intl and the only airport in Ontario is Ontario.

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

    We unfortunately don’t have that data for this specific route.

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

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

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

    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 San José to Ontario.

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

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

    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 Ontario with an airline and back to San José with another airline. Booking your flights between San José and ONT 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 San José to Ontario?

    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 Ontario from San José up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from San José to Ontario

 
See real verified KAYAK customer reviews for airlines flying from San José to Ontario. 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 San José to Ontario? 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.
7.4
United AirlinesOverall score based on 9143 reviews
7.1Entertainment
7.3Comfort
7.7Boarding
8.1Crew
6.6Food
Airline reviews

On the way my flight entertainment wouldn’t work the screen went black and no matter how many times I tried to turn it on it wouldn’t. Food was surprisingly good but the tray tables were tiny so you couldn’t get anything else on the table. The seats hardly go back and are not overly comfortable. Wouldn’t fly United again.

4.0 OkayJaia, Jan 2026
AKL - SFO
Read more United Airlines reviews

On the way my flight entertainment wouldn’t work the screen went black and no matter how many times I tried to turn it on it wouldn’t. Food was surprisingly good but the tray tables were tiny so you couldn’t get anything else on the table. The seats hardly go back and are not overly comfortable. Wouldn’t fly United again.

Unbelievably poor service from flight attendants. They didn’t even do water service on a four hour flight. Just disrespectful.

It was good, although we could not get our preferred seats, we did enjoy the whole experience from Costa Rica. I still don't understand why our luggage is not the first to come out at the band.

Flight was late - I was downgraded from first class to coach

Movie selection is good. Crew did not understand mileage program and were no help. Sick later. Food?

United needs to step up their game. Delayed flight leaving Seattle, San Francisco. Older aircraft, not very comfortable.

The flight attendants were very rude, beyond comprehension. I took a business class from London to SFO for the first time on United. When I asked for a second piece of bread during dinner, the serving attendant threw a 3rd bread on my plate and said, “here. You can have this one too”! I couldn’t believe the rudeness of the attendant. Most all attendants were very rude, unhelpful, sing the food was absolutely disgusting. Never fly United internationally in business class. My flight back to SFO was a nightmare!!

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 from Rome to SFO was excellent compared To our flight to Europe from SFO. The food was much tastier. You can see how UNITED is skimping, though. Instead of getting something mid flight you had to ask for it. It was not automatically served. There was a cookie at the end of the arrival meal, for example that tasted like it just came out of a box. They used to serve a little container of nuts, now … a tiny container of nuts, mixed with pretzels. This was business class that you really have to pay for! But this is minor complaints compared to the overall. My major complaint is the position of the even numbered seats by the windows. You have to turn around to see your window & the positioning as some other controls are harder to get at. This is compared to the odd number seat that are perfectly aligned.

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

Information on your arrival and departure airports

San José (SJO)
Ontario (ONT)