ONT - SJO

$151 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 9/18. 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 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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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, Sep 25 - Tue, Sep 30
Avianca Logo
11:25 pm - 11:15 amONT-SJO
10h 50m1 stop
Avianca Logo
9:35 am - 9:55 pmSJO-ONT
13h 20m1 stop
$310Avianca
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Sat, Sep 20 - Sat, Sep 27
Avianca Logo
11:25 pm - 11:15 amONT-SJO
10h 50m1 stop
Avianca Logo
5:05 am - 9:55 pmSJO-ONT
17h 50m1 stop
$314Avianca
Find Deal
Thu, Oct 2 - Sat, Oct 4
Avianca Logo
11:25 pm - 1:30 pmONT-SJO
13h 05m1 stop
Avianca Logo
5:05 am - 9:55 pmSJO-ONT
17h 50m1 stop
$320Avianca
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Thu, Jan 29 - Mon, Feb 2
American Airlines Logo
8:43 am - 11:00 pmONT-SJO
12h 17m1 stop
American Airlines Logo
6:29 am - 10:02 pmSJO-ONT
17h 33m1 stop
$372American Airlines
Find Deal
Thu, Jan 29 - Mon, Feb 2
American Airlines Logo
3:00 pm - 12:05 pmONT-SJO
19h 05m2 stops
American Airlines Logo
6:29 am - 5:53 pmSJO-ONT
13h 24m1 stop
$376American Airlines
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Wed, Feb 25 - Tue, Mar 3
United Airlines Logo
5:40 am - 8:39 pmONT-SJO
12h 59m2 stops
United Airlines Logo
9:30 am - 6:00 pmSJO-ONT
10h 30m1 stop
$399United Airlines
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Mon, Oct 20 - Sat, Nov 1
 Logo
6:36 pm - 7:15 amONT-SJO
11h 39m1 stop
 Logo
9:35 am - 9:55 pmSJO-ONT
13h 20m1 stop
Tue, Sep 23 - Sun, Sep 28
United Airlines Logo
6:50 pm - 12:26 pmONT-SJO
16h 36m2 stops
United Airlines Logo
8:37 am - 7:35 pmSJO-ONT
11h 58m1 stop
$445United Airlines
Find Deal
Fri, Sep 26 - Thu, Oct 2
 Logo
6:36 pm - 7:15 amONT-SJO
11h 39m1 stop
 Logo
3:05 pm - 9:55 pmSJO-ONT
7h 50m1 stop
Fri, Oct 17 - Thu, Oct 23
JetBlue Logo
10:56 pm - 1:00 pmONT-SJO
13h 04m1 stop
JetBlue Logo
2:05 pm - 9:29 pmSJO-ONT
32h 24m1 stop
$474JetBlue
Find Deal
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 $436 (return) on average. On the other hand, the most expensive months are December and November, where the average cost of round-trip tickets is $1,652 and $682 respectively.

Good to know

Low seasonMarch
Cheapest flight$151
Best time to beat the crowds with an average 19% drop in price.
Most popular time to fly and prices are also 22% 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 $151 for a one-way ticket and $310 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?

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

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

    The two airlines most popular with KAYAK users for flights from Ontario to San José are Southwest and United Airlines. With an average price for the route of $698 and an overall rating of 8.0, Southwest is the most popular choice. United Airlines is also a great choice for the route, with an average price of $533 and an overall rating of 7.4.

  • 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 4 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.
8.0
SouthwestOverall score based on 4238 reviews
7.0Food
8.1Boarding
7.5Entertainment
8.0Comfort
8.6Crew
Airline reviews

The cabin was quiet for the redeye flight. The area was clean. The staff was great. The 787 Max was in good condition. Drawbacks were that the seat widths were tight for some passengers. The seat padding was at best average and for a long flight uncomfortable.

10.0 ExcellentJoseph, Aug 2025SFO - BWI
Read more Southwest reviews

The cabin was quiet for the redeye flight. The area was clean. The staff was great. The 787 Max was in good condition. Drawbacks were that the seat widths were tight for some passengers. The seat padding was at best average and for a long flight uncomfortable.

Delayed flight. Nicest crew member was a SW pilot flying seated next to me who kindly move to seat the final passenger. Flight extra delayed. My cup of refreshment of ginger ale was so packed with ice it was literally 2 sips.

No trays in our seats, we sat in first row, purchased a business class fare. Had to hold our drinks and snack in our hands. No plugs for our cell phones. Had to pay for it a drink cocktail each. Seats so uncomfortable.

Flight wasn’t even full, but too many carry-ons caused us to run out of bin space. New bag fee has folks who would usually check their bags carrying on. Watching Southwest morph into Spirit/Frontier is so sad to watch

Southwest is Southwest. No frills. If you're luck enough to get a happy crew (we did), then it makes for a nicer flight.

It was a perfect flight in all aspects! Both legs!

Great flight, 47 passengers on a 180 seat plane. Stewardess was pleasant and cheerful.

I liked the crew member who gave flight instructions on "in case of a problem:. The seats are so small that only a young teenager could sit in middle seat.

Great flight staff. Ease of boarding. Overall, very uneventful and easy trip.

Employees were kind and funny, as always! Flight was late but no announcements were made for people with tight connections to help them transition quickly. No service due to turbulence.

From the first moment you interact with United Airlines, you can expect nothing less but extreme frustration. The baggage handler at the bag drop seems completely unbothered by the presence of customers waiting in line. No help was extended to load the baggage whatsoever. And if any of your bags is overweight by 0.01 pound they will make you re-distribute everything in your suitcase just to play power trip. When it was time to board no help was extended to customers to locate their seats. Moreover. It was a chaotic mess at the gate when it was unclear who should board first and everyone just bunched up, trying to get on the plane. I am sure the crew was doing their best to perform their jobs while being paid their wages however it shouldn’t be that hard to smile once or twice when you’re in the business if serving customers. It is a shame for the United States of America to have a flagship carrier of such low caliber. Our flight was also delayed by about an hour and a half due to further delays prior to our inbound flight. Being someone who has travelled for both business and leisure in Asia, Europe, and South America I have never experienced such poor quality of service.

I understand stuff happens, but plane failures are likely due to lack of maintenance. Additionally, air conditioning wasn't working, no snack/drink service, no WiFi. Fortunately, the crew was communicative and light-hearted. United grabbed another plane and we were able to get to our destination.

The pilots were late and it made us 1 hour late. The meat was tough and bok choy was also tough.

Stuck on tarmac for two hours plus a 5.5 hour flight. Rude flight attendant. And no meals, not even for purchase!

I learned that seating towards the end of plane that a line forms for the restroom and people use your chair as a hand railing, bumping your seat consistently. I was seated in the aisle. I think that next time if I am towards the back row I would want to sit in the middle or window seat.

The best airline I have ever travel , really good customer service, attention and service !!

United sent me a mileage plus number last year but that number is invalid so I can’t use it to check into flights or collect mileage. There is human to speak about the problem, only computers who keep asking me if I am using the correct email. It’s so frustrating and I cannot resolve it.

Not a great experience. We paid for the upgrade for premium economy seats and seated ourselves in very comfortable seats. Someone came along with the same seat on their boarding pass. The aircraft had been changed and as a result we were booted out and sent further back to small uncomfortable seats. After complaining we were moved to emergency row seats, which gave us more leg room but the seats don’t recline. For people in our 70’s we found having to sit upright from California to NJ very uncomfortable. Not sure why they chose to move senior citizens instead of the two people that were allowed to take the more comfortable seats. Not happy.

Everything was great. Only thing that could’ve made it better was buy on board options for hot food, but the snacks were decent. The flight attendants were great. I had no complaints. I was able to make it to my destination safely

Boarded plane and then delayed 1.5 hours while on the plane

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.

4 hours late, including over +1 hour waiting in plane to take off. Baggage left behind too.

While waiting to claim my checked luggage, I discovered the airline had lost it. After a long wait and inquiries, I discovered it was on another flight. Fortunately, the airline finally sent my luggage home.

Was not able to watch most shows on the entertainment site. They would not load

Our flight was 1.5 hours delayed. There was no weather for the inbound flight, so I don't understand why. This meant a VERY late arrival and only a quick nap before my morning flight.

Delayed flight, so I switched fights to SFO to Phoenix , Phoenix to DSM. Excellent service through American Airlines

AA re-routed flight from HNL to LAX due to delay. My group of 3 with reserved seats in row 9 was broken up, with one assigned to a middle seat, another in the last row of the plane. Not happy. No explanation to the delay. No apologies. No compensation. Would have been nice to be offered an Admiral Club admission or a voucher for the extra 3 hours of layover in LAX. Could not hear the boarding gate announcements in LAX. Adjacent gate was boarding at the same time. Loud speakers were competing against each other. Barely made my boarding group.

Almost a 6 hour flight and the only food option is a cheese plate… and chips. Also how is it there are no options for texting on American. I’ll be going back to delta and united.

Bad food, small seats that didn’t recline. I thought I was buying a quantas ticket so I feel like I got scammed

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

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.

No food, terms when selling are not clear. To pricy for the service in general

It was horrible. My experience with Avianca. I didn’t know it was Pakistan international Airlines but anyway, whatever it is it is bad horrible you guys need to upgrade everything in those planes. And you guys charge $130 for a carry-on did they wanna let me in with my carry-on that I travel everywhere with the luggage you guys are such a dog thank you

The incoming plane was late and no information was shared. They even announced we would board in 10 muntes 40 minutes prior to the plane arriving, and the website said until takeoff that we had taken off an hour earlier

Boarding was excessively slow. They do it by groups in a way that it doesn’t make sense. After business class , ppl that need assistance and any other priority group they should have ppl board from the back to the front. First rows 20+. Then 15+. Then 10, etc. having ppl sitting in the back board last makes no sense. The libe backame long as soon as ppl on rows 10 or so where told to board. The line went all the way up the ramp and tunnel for 25 mins.

Seats are very tight even in Plus, no complimentary snacks or beverage

Flight to Bogotá delayed by 3 h Missed connection from Bogotá to Guayaquil. Avianca unable to bring us to Baltra on time Overall delay 36h. We missed boat departure from galagos. Overall 10 day trip needed to be cancelled. Avianca was completely un-professional.

I receive a service for what I pay, so it is fair.

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

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