ONT - SJO

$178 Find Cheap Flights from Ontario to San José

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 José departing on 5/17. 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 José

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

Cheapest round-trip
$444
Overall average: $531
Avianca
Thu 5/14Tue 5/19
ONT - SJO • 1 stop
Cheapest one-way
$178
Typical prices: $250-$289
Multiple Airlines
Sun 5/17
ONT - SJO • 2 stops
Top airlines
Cheapest • from $444 (round-trip)
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Ontario and San José. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $525 (round-trip)
Shortest trip • 9h 28m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 24% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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 José!
Flight Deals
Booking Insights
Flight Deals

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

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

Thu, May 14 - Tue, May 19
Avianca Logo
11:35 pm - 8:45 am
ONT
-
SJO
8h 10m
1 stop
Avianca Logo
3:10 pm - 9:45 pm
SJO
-
ONT
7h 35m
1 stop
$444Avianca
Thu, Apr 30 - Tue, May 5
Avianca Logo
11:35 pm - 8:45 am
ONT
-
SJO
8h 10m
1 stop
Avianca Logo
3:10 pm - 9:45 pm
SJO
-
ONT
7h 35m
1 stop
$445Avianca
Mon, Apr 27 - Wed, May 6
American Airlines Logo
11:29 pm - 11:35 am
ONT
-
SJO
11h 06m
1 stop
American Airlines Logo
2:08 pm - 10:36 pm
SJO
-
ONT
9h 28m
1 stop
$448American Airlines
Sun, May 10 - Tue, May 19
United Airlines Logo
1:30 pm - 7:15 am
ONT
-
SJO
16h 45m
1 stop
United Airlines Logo
8:45 am - 5:52 pm
SJO
-
ONT
10h 07m
1 stop
$454United Airlines
Mon, Apr 27 - Mon, May 4
American Airlines Logo
11:29 pm - 11:35 am
ONT
-
SJO
11h 06m
1 stop
American Airlines Logo
2:22 pm - 10:09 am
SJO
-
ONT
20h 47m
2 stops
$459American Airlines
Fri, May 1 - Sun, May 10
American Airlines Logo
11:59 pm - 7:07 pm
ONT
-
SJO
18h 08m
2 stops
American Airlines Logo
11:35 pm - 10:09 am
SJO
-
ONT
11h 34m
1 stop
$464American Airlines
Tue, May 19 - Tue, Jun 2
Avianca Logo
11:35 pm - 11:30 am
ONT
-
SJO
10h 55m
1 stop
Avianca Logo
3:10 pm - 9:45 pm
SJO
-
ONT
7h 35m
1 stop
$471Avianca
Thu, Apr 9 - Thu, Apr 16
Avianca Logo
11:35 pm - 8:45 am
ONT
-
SJO
8h 10m
1 stop
Avianca Logo
9:40 am - 9:45 pm
SJO
-
ONT
13h 05m
1 stop
$481Avianca
Wed, Sep 2 - Sat, Sep 5
Multiple Airlines Logo
9:36 pm - 9:51 pm
ONT
-
SJO
23h 15m
2 stops
Multiple Airlines Logo
7:00 am - 11:05 pm
SJO
-
ONT
17h 05m
2 stops
$482Multiple Airlines
Sat, May 16 - Tue, May 19
Avianca Logo
11:35 pm - 8:45 am
ONT
-
SJO
8h 10m
1 stop
Avianca Logo
3:10 pm - 9:45 pm
SJO
-
ONT
7h 35m
1 stop
$484Avianca
Booking Insights

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

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

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to San José, 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 José is October, where tickets cost $371 (return) on average. On the other hand, the most expensive months are June and November, where the average cost of round-trip tickets is $574 and $546 respectively.

Good to know

Low seasonFebruary
Cheapest flight$178
Best time to beat the crowds but there is an average 2% increase in price.
Most popular time to fly with an average 9% increase in price.
Flight from Ontario to San José

When to book flights from Ontario to San José

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

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

    In the last 3 days, the lowest price for a flight from Ontario to San José was $178 for a one-way ticket and $444 for a round-trip.

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

    A passport is required to fly from Ontario to San José.

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

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

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

    oneworld, and Star Alliance are the airline alliances operating flights between Ontario and San José, with oneworld being the most commonly used for this route.

  • Which is the best airline for flights from Ontario to San José, United Airlines or American Airlines?

    The two airlines most popular with KAYAK users for flights from Ontario to San José are United Airlines and American Airlines. With an average price for the route of $474 and an overall rating of 7.4, United Airlines is the most popular choice. American Airlines is also a great choice for the route, with an average price of $574 and an overall rating of 7.1.

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

    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 José.

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

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

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

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

Reviews of the top 3 airlines serving from Ontario to San José

 
See real verified KAYAK customer reviews for airlines flying from Ontario to San José. 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 José? 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 9427 reviews
7.3Comfort
7.1Entertainment
7.7Boarding
8.1Crew
6.6Food
Airline reviews

The 777’s economy seat’s legroom was more tolerable than expected. I appreciate the reclining mechanism which slides the seat forward to minimize cannibalizing the space behind. The food was terrible: very salty.

6.0 GoodAnonymous, Mar 2026
SFO - NRT
Read more United Airlines reviews

The 777’s economy seat’s legroom was more tolerable than expected. I appreciate the reclining mechanism which slides the seat forward to minimize cannibalizing the space behind. The food was terrible: very salty.

Seats are uncomfortable. This has been a trend in the industry for decades. Trying to fit more seats on each plane to increase profits at the expense of the passenger.

Staff were good. My seat was in need of repair, but for a short flight was not problematic. Usual basic snack and drink setup that you'll find on any US carrier. Over, a decent, basic flight.

Complimentary light meal would be appreciated. But great flight crew service on all legs

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

We had turbulence ever 1/2 hr or so and the captains announcements were SOOOO LOUD

Women boarding passengers at the gate was absolutely rude and disrespectful of passengers. The flight attendant was absolutely delightful! Smiling and connected with the passengers. So happy. The seats are cramped and uncomfortable but I guess that’s just the way it is Communication regarding flight was excellent

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

Entertainment kept turning itself off. Gave up on watching a movie.

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

Dloght delayed by 2.5 hrs . Common theme in my last four american floghts

They are rarely on time! Very hard to plan your travels when flights or connections keep getting delayed.

My seat was assigned last row behind restrooms No legroom’s I’m very Pettit Still was not comfortable Food choice was excellent

The worst Airline ever. They centered my second flight and leave me in NY. They don’t have any representatives at the airport and they don’t respond to calls. Basically I got stuck. I will never purchase through there again.

The chicken wrap was tiny ($13 for what looked like a 1/3 of a normal wrap?) and disgusting.

Mediocre would be best description. Food bland. Seat biz class uncomfortable to sleep. Crew never dimmed lights completely in an overnight flight to Europe. Would avoid AA if possible.

Small plane, poor meal choices for first class, bad terminal and boarding experience at LAX

Massimo, flight attendant was very authentic, attentive - wonderful. Food/wrap was just okay.

Experience was great. The best part is the free Wi-Fi connection which helps me to work on the flight

The flight was fine. It's the satellite terminal that supports American eagle flights is what sucks. There is only one food option and everything there is way overpriced. I mean I know it's airport pricing, but it's even crazier than that. I bought a sandwich in a plastic container for $18.

Horrible experience with Avianca, they delayed their flight and when we arrived to NYC, AVIANCA took 1 hr y 30 mins to park the airplane and all passenger get off the plane, it made me lost all my trains to get back home and I came back to my place at 3 am instead of 12 am. On the top of that their plane seat are so uncomfortable and is not enough space and killed my legs and knees, Avianca used to be good when it was a Colombian company, now after Brasilian company bought them, their service quality is bad and their flights are delayed and oversold.

It was delayed and I lost my connection flight to Cali and I missed my Mom's funeral

I actually upgraded to the medium level of seats from basic and even doing that it may have been physically the most uncomfortable flight I have ever had. They packed everyone like is a train to death camp. It was a red eye so I hoped to get some sleep but it was physically impossible to find a comfortable way to rest. I met other folks on the same flight and they said the same thing. It was an utterly miserable flight and if I have any other options I will never fly with them again

Deplaning was a mess, I sat in business (seats are horrible) and the front door had a problem so we had to deplane from the rear exit. The stairs were not tall enough to reach so there was a large step down from the plane to the top of the stairs.

Staff are the rudest in the industry … awful customer service … will never fly Avianca again

Pros: we leave and arrive on time Cons: the most uncomfortable seats ever. You cant recline at all your seats. No entertainment No TVs flight attendants didn't provide even a glass of water. You have to go to back of the airplane and ask for one. I am Colombian and I remember seeing the flight attendants very neat, elegants which is or was a staple of Avianca.it was one with tennis shoes, no male up, the hair was messy... that was really odd.

Here we have another airline flying to Guatemala but doesn't have a plus or a less, just in the middle. Why? Well, first we don't have even free water Movie selection is poor Seats don't recline in some places Food selection is carb based Forgot to mention, customer service on the web is the worst. Good things; Very reliable on schedule Kind crew

Last seat of Bussines Class it does recline but passenger seating behind kept pushing since they did not have space once my seat was reclined

I like the crew they're very friendly. I don't like. on five hour flight they not offered snacks. Any drink. Not even coffee

Not even water is offered on the flight. You cannot lean back on the seats and the seats are so narrow you can’t avoid rubbing elbows with the person next to you.

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

Information on your arrival and departure airports