SJO - ONT

$157 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 12/11. 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 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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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, Oct 23 - Sat, Nov 1
United Airlines Logo
1:30 pm - 5:23 pmSJO-ONT
28h 53m2 stops
United Airlines Logo
1:32 pm - 11:25 amONT-SJO
20h 53m2 stops
$267United Airlines
Find Deal
Sat, Nov 1 - Tue, Nov 11
American Airlines Logo
6:44 am - 6:52 pmSJO-ONT
13h 08m1 stop
American Airlines Logo
10:34 pm - 12:19 pmONT-SJO
11h 45m1 stop
$281American Airlines
Find Deal
Fri, Nov 7 - Tue, Nov 11
American Airlines Logo
2:59 pm - 9:56 amSJO-ONT
20h 57m1 stop
American Airlines Logo
10:34 pm - 12:19 pmONT-SJO
11h 45m1 stop
$282American Airlines
Find Deal
Fri, Nov 7 - Sun, Nov 9
American Airlines Logo
2:59 pm - 9:56 amSJO-ONT
20h 57m1 stop
American Airlines Logo
10:34 pm - 12:19 pmONT-SJO
11h 45m1 stop
$284American Airlines
Find Deal
Sun, Oct 26 - Sat, Nov 1
Lufthansa Logo
8:40 am - 12:37 pmSJO-ONT
28h 57m1 stop
Lufthansa Logo
6:05 am - 1:15 pmONT-SJO
30h 10m1 stop
$309Lufthansa
Find Deal
Thu, Oct 30 - Wed, Nov 5
United Airlines Logo
7:45 am - 10:51 pmSJO-ONT
16h 06m2 stops
United Airlines Logo
6:05 am - 1:15 pmONT-SJO
29h 10m1 stop
$321United Airlines
Find Deal
Thu, Dec 18 - Sat, Jan 10
Avianca Logo
9:35 am - 8:55 pmSJO-ONT
13h 20m1 stop
Avianca Logo
10:30 pm - 11:25 amONT-SJO
10h 55m1 stop
$350Avianca
Find Deal
Thu, Nov 6 - Wed, Nov 12
Lufthansa Logo
9:40 am - 10:51 pmSJO-ONT
15h 11m1 stop
Lufthansa Logo
6:38 pm - 8:32 amONT-SJO
11h 54m1 stop
$408Lufthansa
Find Deal
Wed, Dec 24 - Thu, Jan 1
Delta Logo
7:00 am - 12:29 pmSJO-ONT
31h 29m2 stops
Delta Logo
7:05 am - 9:55 pmONT-SJO
12h 50m1 stop
$448Delta
Find Deal
Sat, Nov 1 - Sat, Nov 22
Avianca Logo
9:35 am - 9:55 pmSJO-ONT
13h 20m1 stop
Avianca Logo
10:30 pm - 1:40 pmONT-SJO
13h 10m1 stop
$565Avianca
Find Deal

Everything you should know

Top airlines
United Airlines
Cheapest • from $267 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
May
Cheapest • 21% price drop
October
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$267
Typical prices: $376-$748
United Airlines
Thu 10/23Sat 11/1
SJO - ONT • 2 stops
Cheapest one-way
$157
Typical prices: $186-$255
American Airlines
Thu 12/11
SJO - ONT • 1 stop
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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!
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.

How much is a round-trip flight from San José to Ontario?

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

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

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

For San José to Ontario, Tuesday is the cheapest day to fly on average and Wednesday is the most expensive. Flying from Ontario back to San José, the best deals are generally found on Monday, with Friday being the most expensive.

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 May, where tickets cost $387 (return) on average. On the other hand, the most expensive months are November and February, where the average cost of round-trip tickets is $697 and $589 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 12 weeks before departure.

Good to know

Low seasonMarch
Cheapest flight$157
Best time to beat the crowds with an average 14% drop in price.
Most popular time to fly with an average 13% 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 $157 for a one-way ticket and $267 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 8968 reviews
7.1Entertainment
6.6Food
7.7Boarding
7.3Comfort
8.1Crew
Airline reviews

The internet service I paid for didn’t work at all and the flight crew was not very friendly.

6.0 GoodLucia, Oct 2025BNA - SFO
Read more United Airlines reviews

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.

I understand that the food on the airplane wouldn’t be fantastic. However, it wasn’t good at all. 😭

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!

I found the staff to not be very attentive at all. When paying for Business Class you expect a certain type of service and that was not found. They were almost rude even

Ok. Get a different kosher caterer. The food was odd.

Our experience on United Airlines was extremely poor. The plane was extremely cold throughout our entire flight- which multiple people complained about- and we had to wait 2 hours to get a blanket which was too thin and barely helped warm us up. As well as this, none of the entertainment features were working so we had to sit through a roughly 10 hour flight with nothing to keep our attention, including the actual flight path screen. It was an extremely disappointing experience and I would hope that this gets fixed if we ever choose United Airlines again.

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

Information on your arrival and departure airports

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