ONT - SJO

$156 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 3/9. 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
$304
Overall average: $510
American Airlines
Wed 1/21Wed 2/4
ONT - SJO • 1 stop
Cheapest one-way
$156
Typical prices: $213-$303
American Airlines
Mon 3/9
ONT - SJO • 2 stops
Top airlines
American Airlines
Cheapest • from $304 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
October
Cheapest • 30% price drop
January
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

Wed, Jan 21 - Wed, Feb 4
American Airlines Logo
6:00 am - 11:43 pm
ONT
-
SJO
15h 43m1 stop
American Airlines Logo
2:54 pm - 10:48 pm
SJO
-
ONT
9h 54m1 stop
$304American Airlines
Wed, Jan 21 - Wed, Feb 4
American Airlines Logo
7:16 am - 11:43 pm
ONT
-
SJO
14h 27m1 stop
American Airlines Logo
2:13 pm - 10:08 am
SJO
-
ONT
21h 55m2 stops
$308American Airlines
Mon, Feb 2 - Tue, Feb 10
American Airlines Logo
11:59 pm - 12:43 pm
ONT
-
SJO
10h 44m2 stops
American Airlines Logo
2:54 pm - 10:48 pm
SJO
-
ONT
9h 54m1 stop
$330American Airlines
Thu, Feb 19 - Thu, Feb 26
United Airlines Logo
6:00 am - 8:39 pm
ONT
-
SJO
12h 39m1 stop
United Airlines Logo
9:40 am - 10:57 pm
SJO
-
ONT
15h 17m1 stop
$334United Airlines
Mon, Jan 12 - Thu, Jan 22
American Airlines Logo
11:59 pm - 10:30 pm
ONT
-
SJO
20h 31m2 stops
American Airlines Logo
2:54 pm - 6:45 pm
SJO
-
ONT
29h 51m1 stop
$335American Airlines
Mon, Jan 26 - Fri, Jan 30
American Airlines Logo
3:09 pm - 3:01 pm
ONT
-
SJO
21h 52m1 stop
American Airlines Logo
2:54 pm - 10:08 am
SJO
-
ONT
21h 14m1 stop
$336American Airlines
Mon, Jan 19 - Mon, Jan 26
American Airlines Logo
7:30 pm - 12:38 pm
ONT
-
SJO
15h 08m2 stops
American Airlines Logo
4:02 pm - 10:08 am
SJO
-
ONT
20h 06m2 stops
$338American Airlines
Mon, Jan 19 - Sat, Feb 28
American Airlines Logo
7:30 pm - 12:38 pm
ONT
-
SJO
15h 08m2 stops
American Airlines Logo
12:31 am - 10:07 am
SJO
-
ONT
11h 36m1 stop
$343American Airlines
Mon, Jan 19 - Mon, Jan 26
American Airlines Logo
7:30 pm - 12:38 pm
ONT
-
SJO
15h 08m2 stops
American Airlines Logo
2:54 pm - 10:08 am
SJO
-
ONT
21h 14m1 stop
$347American Airlines
Mon, Jan 19 - Mon, Jan 26
United Airlines Logo
6:00 am - 6:16 pm
ONT
-
SJO
10h 16m1 stop
United Airlines Logo
9:40 am - 5:43 pm
SJO
-
ONT
10h 03m1 stop
$362United Airlines
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’s the cheapest day of the week to fly from Ontario to San José?

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

If you are looking for a flight deal from Ontario to San José, look for departures on Mondays and avoid leaving on a Friday, as it's usually the priciest day. When flying back from San José, Tuesday is the cheapest day to fly and Wednesday is the most expensive.

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 February and November, where the average cost of round-trip tickets is $681 and $617 respectively.

Good to know

Low seasonMarch
Cheapest flight$156
Best time to beat the crowds with an average 1% drop in price.
Most popular time to fly and prices are also 4% lower on average.
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 $156 for a one-way ticket and $304 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 $485 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 $585 and an overall rating of 7.2.

  • 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 9066 reviews
7.7Boarding
6.6Food
7.1Entertainment
7.3Comfort
8.1Crew
Airline reviews

from SFO-> FRA flight, AVML meal was significantly less compared to regular meal, especially no Desert, no Bread, no sides.

10.0 ExcellentAnonymous, Nov 2025
SFO - FRA
Read more United Airlines reviews

from SFO-> FRA flight, AVML meal was significantly less compared to regular meal, especially no Desert, no Bread, no sides.

This was an older airplane. The cabin was constantly warm to hot throughout the 10 hour flight and there were no vents to personalize air flow. Also since it was an older plane, the material and comfort of the chairs were very uncomfortable. I left my flight with major soreness on my tailbone.

Older aircraft, no meal, only food was for purchase. Not impressed United.

Not pleasant trip cross country when the entertainment and WiFi system not working. No entertainment for entirety of route. Staff was rather nonchalant in that they dismissed the problem due to age of plane. It would have been nice to know this up front so I could have come prepared to read or download movies before boarding Coincidentally or not, there was a similar issue with the entertainment system on my previous flight I took on my fist leg of the trip. There are no seat TVs, so you must rely on the app when it works. United can do better. Also, what use it it to pay for boarding group 2 when half of the passengers are in the same line as you?

My experience on this United Airlines flight was highly uncomfortable, primarily due to two issues: Cabin Temperature: The temperature on the Boeing 737 MAX 8 was unacceptably high, feeling consistently around 80 degrees throughout the flight. This made sleeping impossible and significantly detracted from the experience. Seating Arrangement: Being stuck in a middle seat for a six-and-a-half-hour overnight flight compounded the discomfort. Moving forward, I will always purchase a seat assignment to avoid this situation.

Premium Plus is a really good idea for longer flights

Same as last comment. Food sucks. Quality. Not surprising most people have no clue about nourishment Clearly

The flight attendants were great, I joked with one I can’t remember her name, a blond, really sweet. I thought it was run well very professional. This was great i survived Spirit, I know for which I speak.

We were in business class. the angled seats in that class do not have a real window view & the placement of the controls are bad. But we knew that. But the food options were mediocre. The taste was fine, but the size was for a child. It’s just really feels like United is skimping on everything. Even when we were in the Polaris lounge they did not have diet sodas. They said they were out no Coke zero no Diet Coke, etc. I do not think the portion of nuts they serve on the plane could get any smaller. Really a minimal service and offer for what you’re paying for in business.

I was in first class. The outlets at my seat did not work. The plane was shabby and run down. I had prepurchsed a day subscription for internet that was not redeemable. I had to repurchase the internet for my flight and then it didn’t work anyway. Quite disappointed in what was supposed to be the launch of a great vacation.

Horrible. Both legs of my flight were delayed more than 6 hours. No compensation, no screens on the plane, and the plane was not clean.

The flight was smooth, the pilot kept us informed about delays and we arrived more of less on time

The flight was flawless and we even arrived between 20 and 25 minutes early!

Always seated jammed in rear of aircraft Admirals Club food at DFW terminal D was absolute worst food experience and I pay $600/year to eat this dried out junk

Mostly good. Flight was crowded but Airline personnel were very friendly & accommodating. It would be good to have savory snacks rather than just sweet Biscoff cookies.

It was a red eye flight, so no meals were provided, but it was fine with snacks. The seats felt cramped and almost too narrow.

Very crowded flight but what can you expect these days?? Crew was accommodating.

The seats in economy were appeared to be quite thin and lack sufficient cushioning to be comfortable. Perhaps it was my seating position but the plane seemed notably load.

The entertainment package was vast and the selections were very current. Keep updating it was great.

The seat was so hard my tailbone was aching The crew was kind of a b**** because I made a joke that I didn't care if they close the door I total c*** when she was trying to f****** act like she was mad at me because I said that The flight was bumpy. Sure you didnt have control over that.

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.

I couldnt recline the seat. Other than that crew was very attentive and helpful. Thsnk you

I had to go to the boarding counter for them to enter my return flight as it’s not with Avianca. There was a long queue as there were lots of people being called to the counter.

This low cost airline looks and fells more like a local bus. In a 6 hour flight not being able to recline a seat is torture. The only thing available with no charge is a glass of water provided by, mostly, rude staff. Our luggage didn’t arrive

Did not fly with Pakistan International Airlines. Have never flown with Pakistan International Airlines.

Boarding, crew were excellent, food was ok and entertainment need to improve

Usb plugs for charging your phone does not work in every flight. uncomfortable chairs even in higher categories.

The usb plugs for charging your phone didn’t work, the seats were coarse and hard. Not very comfortable. No inflight WiFi

The seats were uncomfortable and barely reclined at all. Very little leg room despite being business class. The crew was friendly and the food was good. Had to use my own phone for in-flight entertainment.

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

Information on your arrival and departure airports