SJO - ONT

$147 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 9/11. 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
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 22% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

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, Sep 11 - Tue, Sep 16
Avianca Logo
9:35 am - 9:55 pmSJO-ONT
13h 20m1 stop
Avianca Logo
11:25 pm - 11:15 amONT-SJO
10h 50m1 stop
$260Avianca
Find Deal
Tue, Sep 9 - Tue, Sep 23
Avianca Logo
3:05 pm - 9:55 pmSJO-ONT
7h 50m1 stop
Avianca Logo
11:25 pm - 1:30 pmONT-SJO
13h 05m1 stop
$265Avianca
Find Deal
Thu, Sep 18 - Thu, Sep 25
American Airlines Logo
7:00 am - 10:16 pmSJO-ONT
16h 16m1 stop
American Airlines Logo
10:35 pm - 7:42 pmONT-SJO
20h 07m2 stops
$281American Airlines
Find Deal
Sat, Nov 8 - Sat, Nov 15
American Airlines Logo
6:22 am - 2:02 pmSJO-ONT
9h 40m1 stop
American Airlines Logo
4:47 pm - 12:22 pmONT-SJO
17h 35m2 stops
$286American Airlines
Find Deal
Thu, Nov 13 - Fri, Nov 28
Delta Logo
2:17 pm - 10:41 pmSJO-ONT
10h 24m1 stop
Delta Logo
7:00 am - 10:15 pmONT-SJO
13h 15m1 stop
$354Delta
Find Deal
Thu, Oct 9 - Wed, Oct 15
 Logo
3:05 pm - 9:55 pmSJO-ONT
7h 50m1 stop
 Logo
1:53 pm - 7:15 amONT-SJO
16h 22m1 stop
Tue, Sep 9 - Wed, Sep 24
 Logo
3:05 pm - 9:55 pmSJO-ONT
7h 50m1 stop
 Logo
8:59 pm - 8:19 amONT-SJO
34h 20m2 stops
Wed, Sep 10 - Mon, Sep 15
United Airlines Logo
1:30 pm - 9:25 pmSJO-ONT
8h 55m1 stop
United Airlines Logo
6:50 pm - 12:26 pmONT-SJO
16h 36m2 stops
$387United Airlines
Find Deal
Wed, Sep 17 - Wed, Sep 24
United Airlines Logo
7:55 am - 9:25 pmSJO-ONT
14h 30m1 stop
United Airlines Logo
6:04 am - 7:37 pmONT-SJO
12h 33m1 stop
$396United Airlines
Find Deal
Sat, Nov 15 - Sat, Dec 6
Delta Logo
7:00 am - 7:42 pmSJO-ONT
14h 42m1 stop
Delta Logo
7:00 am - 10:15 pmONT-SJO
13h 15m1 stop
$521Delta
Find Deal
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’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 October and February, where the average cost of round-trip tickets is $649 and $630 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 26 weeks before departure.

Good to know

Low seasonMarch
Cheapest flight$147
Best time to beat the crowds with an average 7% drop in price.
Most popular time to fly with an average 30% 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 $147 for a one-way ticket and $260 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, oneworld, and SkyTeam are the airline alliances operating flights between San José and Ontario, with SkyTeam being the most commonly used for this route.

  • 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 8930 reviews
8.1Crew
7.1Entertainment
7.7Boarding
6.6Food
7.3Comfort
Airline reviews

The flight was comfortable with the exit row and great service

10.0 ExcellentMark, Aug 2025HNL - LAX
Read more United Airlines reviews

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.

I really enjoyed flying with United airlines amazing experience , good customer service and great food

1.It will be better if sandwich is warm. 2.The food is too salty. 3.Breakfast needs some vegetables or fruits.

Boarded plane and then delayed 1.5 hours while on the plane

It was all good flight was on time, service was good I enjoyed a few movies and everything was smooth

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

Information on your arrival and departure airports

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.