$255 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, 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
$467Multiple Airlines
Sat, Feb 20 - Fri, Feb 26
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
$469Multiple Airlines
Thu, Dec 24 - Wed, Dec 30
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
$546Multiple Airlines
Wed, Jan 20 - Sun, Jan 24
American Airlines Logo
3:56 pm - 8:37 amSJO  San José Juan Santamaria Intl-ONT Ontario
18h 41m2 stops Miami Phoenix Sky Harbor Intl
American Airlines Logo
6:56 pm - 12:18 pmONT  Ontario-SJO San José Juan Santamaria Intl
15h 22m2 stops Phoenix Sky Harbor Intl Miami
$568American Airlines
Tue, Nov 17 - Sat, Nov 21
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
$573Avianca
Tue, May 4 - Tue, May 11
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
$573Avianca
Thu, Jan 21 - Thu, Jan 28
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
$573Avianca
Wed, Dec 23 - Sun, Jan 10
United Airlines Logo
2:25 pm - 12:42 pmSJO  San José Juan Santamaria Intl-ONT Ontario
24h 17m2 stops Houston George Bush Intcntl Denver Intl
United Airlines Logo
6:37 pm - 1:22 pmONT  Ontario-SJO San José Juan Santamaria Intl
16h 45m2 stops San Francisco Houston George Bush Intcntl
$576United Airlines
Wed, Dec 23 - Sun, Jan 10
United Airlines Logo
2:25 pm - 12:42 pmSJO  San José Juan Santamaria Intl-ONT Ontario
24h 17m2 stops Houston George Bush Intcntl Denver Intl
United Airlines Logo
6:37 pm - 1:22 pmONT  Ontario-SJO San José Juan Santamaria Intl
16h 45m2 stops San Francisco Houston George Bush Intcntl
$576United Airlines
Wed, Dec 23 - Sun, Jan 10
United Airlines Logo
2:25 pm - 12:42 pmSJO  San José Juan Santamaria Intl-ONT Ontario
24h 17m2 stops Houston George Bush Intcntl Denver Intl
United Airlines Logo
3:59 pm - 8:32 amONT  Ontario-SJO San José Juan Santamaria Intl
14h 33m1 stop San Francisco
$576United 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

$255
Best time to beat the crowds but there is an average 53% increase in price.
Most popular time to fly and prices are also 3% 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 881 direct flights from within Costa Rica to Ontario. The most common day for departures is Sunday, with 20% 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 10461 reviews
7.7Boarding
7.3Comfort
7.1Entertainment
6.7Food
8.1Crew
Airline reviews

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

8.0 ExcellentAnonymous, Oct 2026
Read more United Airlines reviews

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

⭐ Absolutely AWFUL Experience with United Airlines! If I could give United Airlines ZERO stars, I would. The seats have practically NO legroom, making the flight feel like being crammed into a tin can with nowhere to move. Comfort? Forget about it! And the fees? Absolutely ridiculous! They seem to charge you for EVERYTHING. You pay for your ticket, then get hit with extra charges for things that should be part of a decent flying experience. What’s next, charging passengers for breathing? Flying with United feels less like being a valued customer and more like being a walking wallet. The seats are uncomfortable, the legroom is pathetic, and the constant nickel-and-diming is infuriating. For the price you pay, you would think they could at least provide a little space to stretch your legs and a travel experience that doesn’t leave you feeling ripped off. Do yourself a favor and look at other airlines before booking with United. I certainly won’t be rushing to fly with them again. Absolutely disappointing from start to finish!

My flight from Boston to SFO was fine. Crew was friendly and helpful. Food was mediocre. Fright from SFO to MNL was not as good. My flight attendant was friendly but didn’t seem to have a lot of experience. She seemed overwhelmed. Also, this was the only red eye business class flight I’ve flown which only served dinner 2 hours after takeoff in a 13 hr flight. When I woke up 1 hr before landing, everyone was eating so I assumed bkft was being served. I pushed my button for help and no one came so I approached my flight attendant and she said they don’t serve bkft but she gave me choices for lunch or dinner. I routinely fly business class but I was disappointed with the lack of service and attention I was given on this flight. Also, most airlines will offer a snack or coffee before bkft is served but this was not offered during this flight. Overall, it was disappointing.

It's not United, but TSA security at Terminal A in Newark is a disaster and seriously makes me consider switching to flying out of JFK. The touchless TSA pre-check had a line of over 50 people and the bag screening was so slow that it limited the flow of people through the facial recognition process. It is the only airport that I frequent that has this issue and makes me reconsider whether I should fly out of Newark given the wasted time and frustration it causes. As I said, it is not a United issue but will impact United if people choose to stop utilizing Newark airport because of the poor experience.

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