$236 Find Cheap Flights from Costa Rica to Ontario - Compare and Save

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Cheap Flights from Costa Rica to Ontario

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Costa Rica to Ontario

Wed, Oct 21 - Wed, Oct 28
Southwest Logo
1:00 pm - 10:00 pmSJO  San José Juan Santamaria Intl-ONT Ontario
10h 00m2 stops Houston Hobby Phoenix Sky Harbor Intl
Southwest Logo
5:50 am - 7:40 pmONT  Ontario-SJO San José Juan Santamaria Intl
12h 50m2 stops Sacramento Intl Houston Hobby
$515Southwest
Fri, Oct 2 - Mon, Oct 5
United Airlines Logo
7:55 am - 8:58 pmSJO  San José Juan Santamaria Intl-ONT Ontario
14h 03m2 stops Houston George Bush Intcntl Denver Intl
United Airlines Logo
11:10 am - 12:21 pmONT  Ontario-SJO San José Juan Santamaria Intl
24h 11m2 stops San Francisco Houston George Bush Intcntl
$533United Airlines
Wed, Dec 2 - Tue, Dec 8
United Airlines Logo
9:40 am - 11:06 pmSJO  San José Juan Santamaria Intl-ONT Ontario
15h 26m1 stop San Francisco
United Airlines Logo
1:33 pm - 1:15 pmONT  Ontario-SJO San José Juan Santamaria Intl
21h 42m2 stops San Francisco Houston George Bush Intcntl
$533United Airlines
Mon, Oct 19 - Sat, Oct 24
United Airlines Logo
8:45 am - 5:36 pmSJO  San José Juan Santamaria Intl-ONT Ontario
9h 51m1 stop San Francisco
United Airlines Logo
1:52 pm - 10:25 amONT  Ontario-SJO San José Juan Santamaria Intl
19h 33m2 stops San Francisco Houston George Bush Intcntl
$533United Airlines
Fri, Sep 18 - Sun, Sep 20
American Airlines Logo
2:57 pm - 9:29 amSJO  San José Juan Santamaria Intl-ONT Ontario
19h 32m2 stops Miami Dallas/Fort Worth
American Airlines Logo
1:04 pm - 1:57 pmONT  Ontario-SJO San José Juan Santamaria Intl
23h 53m2 stops Phoenix Sky Harbor Intl Dallas/Fort Worth
$546American Airlines
Thu, Sep 17 - Thu, Sep 24
American Airlines Logo
2:57 pm - 9:29 amSJO  San José Juan Santamaria Intl-ONT Ontario
19h 32m2 stops Miami Dallas/Fort Worth
American Airlines Logo
2:22 pm - 11:59 amONT  Ontario-SJO San José Juan Santamaria Intl
20h 37m2 stops Dallas/Fort Worth Miami
$546American Airlines
Wed, Sep 23 - Mon, Sep 28
American Airlines Logo
2:57 pm - 9:29 amSJO  San José Juan Santamaria Intl-ONT Ontario
19h 32m2 stops Miami Dallas/Fort Worth
American Airlines Logo
2:22 pm - 12:59 pmONT  Ontario-SJO San José Juan Santamaria Intl
21h 37m2 stops Dallas/Fort Worth Miami
$546American Airlines
Tue, Jan 26 - Tue, Feb 2
Avianca Logo
9:40 am - 5:47 pmSJO  San José Juan Santamaria Intl-ONT Ontario
10h 07m1 stop San Francisco
Avianca Logo
4:03 pm - 8:32 amONT  Ontario-SJO San José Juan Santamaria Intl
14h 29m1 stop San Francisco
$591Avianca
Tue, Jan 26 - Tue, Feb 2
Avianca Logo
9:40 am - 5:47 pmSJO  San José Juan Santamaria Intl-ONT Ontario
10h 07m1 stop San Francisco
Avianca Logo
6:00 am - 6:16 pmONT  Ontario-SJO San José Juan Santamaria Intl
10h 16m1 stop Houston George Bush Intcntl
$591Avianca
Thu, Dec 3 - Wed, Dec 9
Avianca Logo
9:40 am - 5:47 pmSJO  San José Juan Santamaria Intl-ONT Ontario
10h 07m1 stop San Francisco
Avianca Logo
6:00 am - 8:39 pmONT  Ontario-SJO San José Juan Santamaria Intl
12h 39m1 stop Houston George Bush Intcntl
$591Avianca
Booking Insights

KAYAK's insights & trends for flights to Ontario

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

What is the cheapest month to fly to Ontario?

The cheapest month for flights to Ontario is January, where tickets cost $327 on average for return flights. On the other hand, the most expensive months are June and September, where the average cost of tickets from Costa Rica is $617 and $575 respectively. For one-way flights, the best month to travel is November with an average price of $162.

How far in advance should I book a flight to Ontario?

To get a below average price, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 12 weeks before departure.

Good to know

Low season

January

Cheapest flight

$236
Best time to beat the crowds with an average 29% drop in price.
Most popular time to fly with an average 26% increase in price.
Flight from San José to Ontario

FAQs - booking Ontario flights

  • How far is Ontario Airport from central Ontario?

    You’ll need to travel 3 miles to reach the Ontario city center from Ontario Airport.

  • What is the name of Ontario’s airport?

    There is only 1 airport in Ontario, called Ontario Airport (ONT). It can also be referred to as Ontario or Ontario Intl.

  • How does KAYAK find such low prices on flights 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 to Ontario.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to 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 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 with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight 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 up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • How many direct flights to Ontario are there each week?

    Each week there are around 959 direct flights from within Costa Rica to Ontario. The most common day for departures is Sunday, with 17% of flights taking off on this day.

Top tips for finding cheap flights to Ontario

  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Ontario flight deals.

Reviews of the top airlines flying from Costa Rica to Ontario

 
Need help choosing which airline to fly with 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 10102 reviews
7.3Comfort
7.7Boarding
8.1Crew
6.7Food
7.1Entertainment
Airline reviews

The flight was excellent. Their was no service as we boarded, the flight attendants spent about 30 minutes just taking and not really caring that the cabin was about 80 degrees and did not offered any beverage to first class passengers or any passenger. The flight from DEN to ONT is not long but not under an hour, we received one drink and bag of chips if you were lucky. I was in first class…. I did leave my hat on the plane and it only took less than five minutes for a United rep to locate and bring it to me.

10.0 ExcellentFred, Aug 2026
Read more United Airlines reviews

The flight was excellent. Their was no service as we boarded, the flight attendants spent about 30 minutes just taking and not really caring that the cabin was about 80 degrees and did not offered any beverage to first class passengers or any passenger. The flight from DEN to ONT is not long but not under an hour, we received one drink and bag of chips if you were lucky. I was in first class…. I did leave my hat on the plane and it only took less than five minutes for a United rep to locate and bring it to me.

The app logs you out right when you are boarding requiring all passwords and reservation number for the flight. Super annoying

The pre-order only approach for fresh food is really challenging

the seat has a problem. the back had a hole.

Old 757 with poor entertainment system. United no longer partners with United for free text and email. O'Hara an absolute disaster! Limited gates clauses two hour delay. Unfortunately this appears to be the norm.

The entire experience convinced my wife, Cathy, and me that traveling Polaris on United is the only way we’ll fly in the future. From check-in and baggage drop to the end of the 12-hour flight, the customer service was exceptional, with numerous staff members exemplifying the very best in care. On board, Andre, our primary crew chief, was sincerely friendly, a consummate professional, and, along with Freddy, one of his team members, truly among the best of the best. The captain even came through the cabin to chat with passengers—a wonderful personal touch, especially on such a long journey.

The SFO lounge closes at 12 midnight. My flight took off at 2AM

Delayed 2 hours while stuck on the aircraft. If the luggage was properly loaded the first time we probably wouldn’t have been delayed at all

Movie selection is good. Crew did not understand mileage program and were no help. Sick later. Food?

Airline did not explain reasons why flight was delayed two hours. Explanations were badly needed and rarely provided. Problem seemed to clearly be the airline’s fault and not the fault of the weather or airport.

Better seats, allow us to upgrade, terrible website, poor telephone service, better equipment

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 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 fees for baggage were outrageous. $130 for carry on and $150 for check in for an international flight. The seats did not recline. We were not even offered water. Had we known all of this, we would not have booked Avianca at all.

I was shocked flying to El Salvador that they only give you water. Everything else you have to pay for. There is no wifi or entertainment and it’s an international flight. At least back in the day they had tvs on the plane and everyone watched the same movie. Also seats do not recline, even comfort or plus.

I did not like anything, first time I use company and for sure it will be the last time, they charge for simple operations that any other average airline wouldn't charge.

The good thing is the flight was on time and the crew was really nice. They can work better the arriving with staff

The inflight entertainment did not work on a 6 hour flight The cel phone chargers did not work There was a 45 minute wait for the luggage to get off the plane.

They could offer free food and drink like other international flights.

Flight attendants to show up on time, offer drinks and food.

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario