ONT - SJO

$147 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 1/27. 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
$311
Overall average: $690
Avianca
Tue 2/24Tue 3/3
ONT - SJO • 1 stop
Cheapest one-way
$147
Typical prices: $259-$274
Avianca
Tue 1/27
ONT - SJO • 1 stop
When to travel
October
Cheapest • 28% price drop
June
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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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 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

Tue, Feb 24 - Tue, Mar 3
Avianca Logo
10:30 pm - 11:25 am
ONT
-
SJO
10h 55m1 stop
Avianca Logo
3:05 pm - 8:55 pm
SJO
-
ONT
7h 50m1 stop
$311Avianca
Tue, May 26 - Thu, May 28
Avianca Logo
11:25 pm - 11:15 am
ONT
-
SJO
10h 50m1 stop
Avianca Logo
3:05 pm - 9:55 pm
SJO
-
ONT
7h 50m1 stop
$323Avianca
Tue, Mar 10 - Tue, Mar 24
Avianca Logo
11:30 pm - 11:25 am
ONT
-
SJO
10h 55m1 stop
Avianca Logo
5:00 am - 9:55 pm
SJO
-
ONT
17h 55m1 stop
$346Avianca
Tue, Jan 20 - Sun, Jan 25
Avianca Logo
10:30 pm - 11:25 am
ONT
-
SJO
10h 55m1 stop
Avianca Logo
3:05 pm - 8:55 pm
SJO
-
ONT
7h 50m1 stop
$353Avianca
Sun, Jan 18 - Wed, Jan 28
United Airlines Logo
1:53 pm - 8:32 am
ONT
-
SJO
16h 39m1 stop
United Airlines Logo
2:20 pm - 9:58 pm
SJO
-
ONT
9h 38m1 stop
$372United Airlines
Sat, Jan 31 - Tue, Mar 31
Avianca Logo
10:30 pm - 1:40 pm
ONT
-
SJO
13h 10m1 stop
Avianca Logo
9:35 am - 9:55 pm
SJO
-
ONT
13h 20m1 stop
$377Avianca
Sat, Mar 14 - Sat, Mar 21
Avianca Logo
11:30 pm - 1:40 pm
ONT
-
SJO
13h 10m1 stop
Avianca Logo
5:00 am - 9:55 pm
SJO
-
ONT
17h 55m1 stop
$387Avianca
Wed, Jan 28 - Wed, Mar 25
American Airlines Logo
3:09 pm - 12:43 pm
ONT
-
SJO
19h 34m2 stops
American Airlines Logo
2:20 pm - 8:49 am
SJO
-
ONT
19h 29m2 stops
$388American Airlines
Sat, May 23 - Sat, May 30
Avianca Logo
11:25 pm - 1:30 pm
ONT
-
SJO
13h 05m1 stop
Avianca Logo
5:05 am - 9:55 pm
SJO
-
ONT
17h 50m1 stop
$390Avianca
Tue, Jan 27 - Sat, Feb 7
Avianca Logo
10:30 pm - 11:25 am
ONT
-
SJO
10h 55m1 stop
Avianca Logo
9:35 am - 8:55 pm
SJO
-
ONT
13h 20m1 stop
$397Avianca
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 June, where the average cost of round-trip tickets is $690 and $574 respectively.

Good to know

Low seasonFebruary
Cheapest flight$147
Best time to beat the crowds but there is an average 33% increase in price.
Most popular time to fly with an average 11% 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 $147 for a one-way ticket and $311 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 $484 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 $560 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 9106 reviews
7.1Entertainment
7.3Comfort
7.7Boarding
6.6Food
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.

Not great. Booked Extra seats and got nothing extra at all. It’s basically a big budget airline.

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.

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.

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

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

Information on your arrival and departure airports