SJO - ONT

$170 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 12/8. 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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Flights 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

Fri, Oct 31 - Mon, Nov 10
United Airlines Logo
8:40 am - 5:34 pmSJO-ONT
9h 54m1 stop
United Airlines Logo
6:38 pm - 8:32 amONT-SJO
11h 54m1 stop
$318United Airlines
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Thu, Aug 14 - Mon, Aug 18
United Airlines Logo
8:45 am - 12:14 pmSJO-ONT
28h 29m1 stop
United Airlines Logo
1:19 pm - 12:26 pmONT-SJO
22h 07m2 stops
$324United Airlines
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Tue, Jul 22 - Tue, Aug 19
American Airlines Logo
11:59 pm - 6:53 pmSJO-ONT
19h 54m1 stop
American Airlines Logo
6:10 am - 6:15 pmONT-SJO
11h 05m1 stop
$339American Airlines
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Tue, Jul 15 - Thu, Jul 24
American Airlines Logo
11:59 pm - 11:56 amSJO-ONT
12h 57m1 stop
American Airlines Logo
12:59 am - 10:05 pmONT-SJO
20h 06m1 stop
$341American Airlines
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Fri, Sep 26 - Tue, Oct 7
Delta Logo
1:35 pm - 12:17 pmSJO-ONT
23h 42m2 stops
Delta Logo
10:59 pm - 11:48 amONT-SJO
11h 49m1 stop
$354Delta
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Wed, Oct 1 - Tue, Oct 7
Delta Logo
1:35 pm - 10:23 pmSJO-ONT
9h 48m1 stop
Delta Logo
10:59 pm - 11:48 amONT-SJO
11h 49m1 stop
$363Delta
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Mon, Dec 22 - Sun, Dec 28
Logo
4:13 pm - 11:12 pmSJO-ONT
8h 59m1 stop
Logo
1:02 am - 11:53 pmONT-SJO
20h 51m1 stop
$392
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Mon, Nov 24 - Thu, Nov 27
Logo
4:13 pm - 11:12 pmSJO-ONT
8h 59m1 stop
Logo
1:02 am - 11:53 pmONT-SJO
20h 51m1 stop
$396
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Sat, Aug 30 - Sun, Aug 31
Avianca Logo
3:05 pm - 9:55 pmSJO-ONT
7h 50m1 stop
Avianca Logo
11:25 pm - 8:40 amONT-SJO
8h 15m1 stop
$417Avianca
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Sun, Aug 24 - Sat, Aug 30
Avianca Logo
3:05 pm - 9:55 pmSJO-ONT
7h 50m1 stop
Avianca Logo
11:25 pm - 1:30 pmONT-SJO
13h 05m1 stop
$453Avianca
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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 September, where tickets cost $373 (return) on average. On the other hand, the most expensive months are February and October, where the average cost of round-trip tickets is $630 and $625 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.

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Good to know

Low seasonMarch
High seasonOctober
Cheapest flight$170
Best time to beat the crowds with an average 6% drop in price.
Most popular time to fly with an average 27% 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 $170 for a one-way ticket and $318 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 Star Alliance 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 8858 reviews
7.0Entertainment
6.6Food
8.1Crew
7.3Comfort
7.7Boarding
Airline reviews

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

10.0 ExcellentAnonymous, Jul 2025YYZ - SFO
Read more United Airlines reviews

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

Horrific. They missed my connecting flight to San Diego. I didn’t get there until Monday at 9am when I had a mandatory court settlement conference scheduled at 6am since we had parties on the east coast. This caused many issues. All because United apparently forgot to hold the doors open until my flight landed that only had a 10 minute delay. This was the last flight to Southern California. So I couldn’t even rent a car to finish the trip. United cannot be trusted when traveling on specific days and times since weather didn’t have anything to do with the delays.

My flight was delayed a very short period of time but they did not hold my connecting flight to San Diego, also through United. So they closed the doors before we got off our plane. They would only have to help the door open for another five to ten minutes. So I missed a court deadline for a manditory mediation settlement conference for my client. I had to get an associate to be there in person and be on the phone with him relaying what he needs to do the entire time. The court was very upset with me and so was my client. United cannot be trusted.

We were given vouchers we couldn’t use with a 5.5 hour delay

Really good 😊 the woman at the gate entrance was a little rude checking in our carry-on but i dont think she worked for the airline, she worked for the airport at sacramento, other than that amazing.

Boarding was mayhem. Late boarding by 15 minutes because of lack of staff (missing 1 flight attendant. We had to wait for an arrival of another plane before we could board). Flight was a little rough, but cannot blame on airlines.

Great experience…left a bit behind schedule but made up fir that in the air and landed 10 minutes early 😁

Airbus plane, nice and polite staff, entertainment even as it was a short flight.

United out of SFO is having issues with catering so none of our meals were loaded on the plane and no offer of compensation for our tickets purchased was offered.

Its good expeince but in enternteiment please be like you tube the music i like or movie

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)

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