$274 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

Sat, Oct 31 - Thu, Nov 5
Avianca Logo
3:10 pm - 9:50 pmSJO  San José Juan Santamaria Intl-ONT Ontario
7h 40m1 stop San Salvador El Salvador Intl
Avianca Logo
10:45 pm - 8:50 amONT  Ontario-SJO San José Juan Santamaria Intl
8h 05m1 stop San Salvador El Salvador Intl
$530Avianca
Tue, Oct 6 - Tue, Oct 13
Avianca Logo
3:10 pm - 9:45 pmSJO  San José Juan Santamaria Intl-ONT Ontario
7h 35m1 stop San Salvador El Salvador Intl
Avianca Logo
11:35 pm - 11:30 amONT  Ontario-SJO San José Juan Santamaria Intl
10h 55m1 stop San Salvador El Salvador Intl
$530Avianca
Thu, Oct 22 - Tue, Oct 27
Avianca Logo
3:10 pm - 9:45 pmSJO  San José Juan Santamaria Intl-ONT Ontario
7h 35m1 stop San Salvador El Salvador Intl
Avianca Logo
11:45 pm - 6:50 pmONT  Ontario-SJO San José Juan Santamaria Intl
18h 05m1 stop San Salvador El Salvador Intl
$530Avianca
Thu, Nov 19 - Tue, Nov 24
Avianca Logo
9:45 am - 8:50 pmSJO  San José Juan Santamaria Intl-ONT Ontario
13h 05m1 stop San Salvador El Salvador Intl
Avianca Logo
10:45 pm - 8:50 amONT  Ontario-SJO San José Juan Santamaria Intl
8h 05m1 stop San Salvador El Salvador Intl
$530Avianca
Mon, Dec 21 - Mon, Jan 11
United Airlines Logo
1:15 am - 10:11 pmSJO  San José Juan Santamaria Intl-ONT Ontario
22h 56m1 stop Houston George Bush Intcntl
United Airlines Logo
6:53 pm - 8:32 amONT  Ontario-SJO San José Juan Santamaria Intl
11h 39m1 stop San Francisco
$533United Airlines
Thu, Dec 24 - Tue, Mar 9
United Airlines Logo
8:45 am - 10:53 pmSJO  San José Juan Santamaria Intl-ONT Ontario
16h 08m2 stops Houston George Bush Intcntl San Francisco
United Airlines Logo
6:53 pm - 8:32 amONT  Ontario-SJO San José Juan Santamaria Intl
11h 39m1 stop San Francisco
$533United Airlines
Thu, Dec 17 - Sun, Jan 10
United Airlines Logo
8:45 am - 10:53 pmSJO  San José Juan Santamaria Intl-ONT Ontario
16h 08m2 stops Houston George Bush Intcntl San Francisco
United Airlines Logo
6:53 pm - 8:32 amONT  Ontario-SJO San José Juan Santamaria Intl
11h 39m1 stop San Francisco
$533United Airlines
Fri, Oct 23 - Sun, Oct 25
Southwest Logo
1:30 pm - 11:55 pmSJO  San José Juan Santamaria Intl-ONT Ontario
11h 25m2 stops Houston Hobby Las Vegas Harry Reid Intl
Southwest Logo
5:50 am - 7:40 pmONT  Ontario-SJO San José Juan Santamaria Intl
12h 50m2 stops San Jose Houston Hobby
$542Southwest
Fri, Nov 6 - Mon, Nov 16
Southwest Logo
2:10 pm - 8:50 amSJO  San José Juan Santamaria Intl-ONT Ontario
20h 40m2 stops Houston Hobby Las Vegas Harry Reid Intl
Southwest Logo
5:00 pm - 12:20 pmONT  Ontario-SJO San José Juan Santamaria Intl
17h 20m2 stops Las Vegas Harry Reid Intl Houston Hobby
$542Southwest
Sat, Dec 12 - Sat, Feb 20
American Airlines Logo
2:07 pm - 9:40 amSJO  San José Juan Santamaria Intl-ONT Ontario
21h 33m2 stops Charlotte Douglas Dallas/Fort Worth
American Airlines Logo
11:59 pm - 1:46 pmONT  Ontario-SJO San José Juan Santamaria Intl
11h 47m1 stop Dallas/Fort Worth
$568American Airlines
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 May, where tickets cost $383 on average for return flights. On the other hand, the most expensive months are August and January, where the average cost of tickets from Costa Rica is $894 and $659 respectively. For one-way flights, the best month to travel is December with an average price of $211.

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

August

Cheapest flight

$274
Best time to beat the crowds but there is an average 64% increase in price.
Most popular time to fly with an average 4% 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 961 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 10237 reviews
7.3Comfort
6.7Food
7.1Entertainment
8.1Crew
7.7Boarding
Airline reviews

My flight got cancelled. Couldn’t get my luggage. It arrived at my destination ahead of me. I didn’t get my preordered meal. Had to spend the night in the airport.

2.0 MediocreCherie, Sep 2026
Read more United Airlines reviews

My flight got cancelled. Couldn’t get my luggage. It arrived at my destination ahead of me. I didn’t get my preordered meal. Had to spend the night in the airport.

United did nit provide any updated on flight crew not bein available until boarding time started. It was bad. Itws alate night flight and there no proactive communication and iha d an important meeting that i missed due to thus

Delayed too much. 1.5 hrs in the airport and another 1 hr in the runway. Got too late in the night. There was no proper food available.

Job well done, being treated for good and helping a lot . thanks you so much till will meet against.

For the Singapore to CA flight, nearly 16 hours long was miserable. We sat on the tarmac for one hour to burn fuel. The flight attendant girls were mean. They would yell at people who stood up to try to stretch their legs. One time the drinks came thru and the lady judged us and made a comment about how much sugar was in apple juice when we ordered it once. She was rude and inappropriate. The entire flight was frustrating. You'd think a long haul like that the airline would try to make you comfortable. I just don't understand why the ladies were so snappy. I have never experienced rude flight attendants like that. It was the longest flight I've had to sit on before. We were not impressed. Raymond on the other hand was amazing! By far the best person working that flight!

premium economy is expensive but worth it for the comfort and food on a long flight

Even though the incoming flight was delayed by 20 minutes they managed to get us to SFO 15 minutes early.

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.

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.

More options for your flight to Ontario