$195 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

Thu, Feb 4 - Fri, Feb 12
Multiple Airlines Logo
3:00 pm - 10:15 pmSJO  San José Juan Santamaria Intl-ONT Ontario
9h 15m1 stop Guadalajara Miguel Hidal
Multiple Airlines Logo
12:05 am - 10:44 pmONT  Ontario-SJO San José Juan Santamaria Intl
20h 39m1 stop Guadalajara Miguel Hidal
$347Multiple Airlines
Sat, Dec 12 - Fri, Feb 19
Multiple Airlines Logo
3:00 pm - 10:15 pmSJO  San José Juan Santamaria Intl-ONT Ontario
9h 15m1 stop Guadalajara Miguel Hidal
Multiple Airlines Logo
12:05 am - 10:44 pmONT  Ontario-SJO San José Juan Santamaria Intl
20h 39m1 stop Guadalajara Miguel Hidal
$366Multiple Airlines
Thu, Feb 4 - Fri, Feb 12
Multiple Airlines Logo
3:00 pm - 10:15 pmSJO  San José Juan Santamaria Intl-ONT Ontario
9h 15m1 stop Guadalajara Miguel Hidal
Multiple Airlines Logo
12:05 am - 10:44 pmONT  Ontario-SJO San José Juan Santamaria Intl
20h 39m1 stop Guadalajara Miguel Hidal
$451Multiple Airlines
Thu, Feb 4 - Fri, Feb 12
Multiple Airlines Logo
3:00 pm - 10:15 pmSJO  San José Juan Santamaria Intl-ONT Ontario
9h 15m1 stop Guadalajara Miguel Hidal
Multiple Airlines Logo
12:05 am - 10:44 pmONT  Ontario-SJO San José Juan Santamaria Intl
20h 39m1 stop Guadalajara Miguel Hidal
$452Multiple Airlines
Thu, Apr 1 - Thu, Apr 8
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 - 8:45 amONT  Ontario-SJO San José Juan Santamaria Intl
8h 10m1 stop San Salvador El Salvador Intl
$594Avianca
Sat, May 1 - Sat, May 8
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 - 8:45 amONT  Ontario-SJO San José Juan Santamaria Intl
8h 10m1 stop San Salvador El Salvador Intl
$594Avianca
Tue, Jan 26 - Tue, Feb 2
Avianca Logo
3:10 pm - 8:50 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
$594Avianca
Wed, Feb 17 - Tue, Mar 9
United Airlines Logo
8:45 am - 10:22 amSJO  San José Juan Santamaria Intl-ONT Ontario
27h 37m2 stops Houston George Bush Intcntl San Francisco
United Airlines Logo
5:00 am - 8:39 pmONT  Ontario-SJO San José Juan Santamaria Intl
13h 39m2 stops Denver Intl Houston George Bush Intcntl
$597United Airlines
Tue, Feb 16 - Mon, Mar 8
United Airlines Logo
2:25 pm - 3:15 pmSJO  San José Juan Santamaria Intl-ONT Ontario
26h 50m2 stops Houston George Bush Intcntl San Francisco
United Airlines Logo
9:03 am - 8:32 amONT  Ontario-SJO San José Juan Santamaria Intl
21h 29m1 stop San Francisco
$597United Airlines
Wed, Feb 3 - Wed, Feb 17
United Airlines Logo
9:40 am - 5:35 pmSJO  San José Juan Santamaria Intl-ONT Ontario
9h 55m1 stop San Francisco
United Airlines Logo
4:17 pm - 8:32 amONT  Ontario-SJO San José Juan Santamaria Intl
14h 15m1 stop San Francisco
$597United 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 October, where the average cost of tickets from Costa Rica is $894 and $717 respectively. For one-way flights, the best month to travel is June with an average price of $254.

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 18 weeks before departure.

Good to know

Low season

August

Cheapest flight

$195
Best time to beat the crowds but there is an average 52% increase in price.
Most popular time to fly and prices are also 4% lower on average.
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 979 direct flights from within Costa Rica to Ontario. The most common day for departures is Sunday, with 19% 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.
7.3
United AirlinesOverall score based on 10484 reviews
7.3Comfort
6.7Food
7.7Boarding
7.1Entertainment
8.1Crew
Airline reviews

Terrible flight attendant. Rushing me as I ate my salad and appetizer. Served my dinner while I was still eating my salad. My dinner was dry and very salty. He asked me what I wanted to drink, I said flavored sparkling water. He said we don’t have that we have plain sparkling water. I’ve flown United many times and I know exactly what they have. 10 minutes later he asked me what flavor sparkling water I wanted. Did this with an attitude as if he was being bothered!

4.0 OkayHelen, Nov 2026
Read more United Airlines reviews

Terrible flight attendant. Rushing me as I ate my salad and appetizer. Served my dinner while I was still eating my salad. My dinner was dry and very salty. He asked me what I wanted to drink, I said flavored sparkling water. He said we don’t have that we have plain sparkling water. I’ve flown United many times and I know exactly what they have. 10 minutes later he asked me what flavor sparkling water I wanted. Did this with an attitude as if he was being bothered!

Starlink internet made the flight time shrink and I was able to work.

The plane was so old. I paid a ridiculous amount to fly business and there was no internet for six hours! This can't be happening in 2026 and especially in cross country flights where there are a high volume of business travelers.

The food could have been better and the entertainment could have better movies or streaming.

Connection times always good online, but not in reality when first leg is delayed (2 out of 2 times this trip).

Worst experience of the 5 flights we took on this vacation. We were in agony by the time we got off the plane because of the lack of cushion in the seats. A sandwich was offered to us within one hour of our takeoff that had pink pork. No gluten-free items were offered for our night meal. Breakfast was given about six hours later well after the sunrise . Strange food was offered: a poached egg that was barely heated and very liquidy, two salads (which is not a normal breakfast food), and a bread bun. We could barely eat any of it. No coffee! I drank green tea. Stewardesses had very nice smiles but never “checked in” with us. Also there was no button on the rooftop to call a steward. We were in terrible pain for more than 3 days after.

I purchased a Polaris ticket. The plane did not have the lie flat seats - I was not notified. I actually can not believe they traded a dif plane and did not notify me or refund monies

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.

There were three people in an economy seat in my row, but the row in front of me, which had the same class of service only had one person. I could barely move and the person in front of me slept on all three seats. If you had moved one person from my row to the row in front, the configuration would have been two on each row with the middle seat empty

It’s a new plane, but the most important detail is that the economy class seat doesn't recline—it’s completely fixed. The only one that reclines is in Comfort Class.

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