$274 Find Cheap Flights from Costa Rica to Ontario - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Ontario departing on 12/4. 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, 0 bags

Save 21% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Costa Rica to Ontario

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Costa Rica to Ontario 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 Costa Rica to Ontario

Thu, Sep 24 - 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
$458American Airlines
Wed, Nov 11 - Wed, Nov 25
Southwest Logo
2:15 pm - 10:00 pmSJO  San José Juan Santamaria Intl-ONT Ontario
9h 45m1 stop Houston Hobby
Southwest Logo
6:30 pm - 1:15 pmONT  Ontario-SJO San José Juan Santamaria Intl
16h 45m2 stops Las Vegas Harry Reid Intl Orlando
$483Southwest
Wed, Nov 11 - Wed, Nov 25
American Airlines Logo
2:01 pm - 8:39 amSJO  San José Juan Santamaria Intl-ONT Ontario
20h 38m2 stops Miami Phoenix Sky Harbor Intl
American Airlines Logo
4:25 pm - 1:43 pmONT  Ontario-SJO San José Juan Santamaria Intl
19h 18m2 stops Phoenix Sky Harbor Intl Dallas/Fort Worth
$487American Airlines
Fri, Oct 2 - Sun, Oct 11
United Airlines Logo
8:45 am - 10:23 amSJO  San José Juan Santamaria Intl-ONT Ontario
26h 38m1 stop San Francisco
United Airlines Logo
9:25 am - 7:15 amONT  Ontario-SJO San José Juan Santamaria Intl
20h 50m1 stop San Francisco
$489United Airlines
Thu, Oct 1 - Wed, Oct 7
United Airlines Logo
8:45 am - 10:23 amSJO  San José Juan Santamaria Intl-ONT Ontario
26h 38m1 stop San Francisco
United Airlines Logo
11:10 am - 7:15 amONT  Ontario-SJO San José Juan Santamaria Intl
19h 05m1 stop San Francisco
$489United Airlines
Fri, Oct 9 - Sun, Oct 18
United Airlines Logo
1:25 pm - 3:22 pmSJO  San José Juan Santamaria Intl-ONT Ontario
26h 57m2 stops Houston George Bush Intcntl San Francisco
United Airlines Logo
9:25 am - 12:21 pmONT  Ontario-SJO San José Juan Santamaria Intl
25h 56m2 stops San Francisco Houston George Bush Intcntl
$489United Airlines
Thu, Sep 24 - 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
10:25 am - 12:59 pmONT  Ontario-SJO San José Juan Santamaria Intl
25h 34m2 stops Dallas/Fort Worth Miami
$511American Airlines
Thu, Sep 10 - Thu, Sep 17
Avianca Logo
8:45 am - 6:11 pmSJO  San José Juan Santamaria Intl-ONT Ontario
10h 26m1 stop San Francisco
Avianca Logo
7:13 pm - 7:15 amONT  Ontario-SJO San José Juan Santamaria Intl
11h 02m1 stop San Francisco
$614Avianca
Thu, Sep 10 - Fri, Sep 18
Avianca Logo
8:45 am - 6:11 pmSJO  San José Juan Santamaria Intl-ONT Ontario
10h 26m1 stop San Francisco
Avianca Logo
7:13 pm - 7:15 amONT  Ontario-SJO San José Juan Santamaria Intl
11h 02m1 stop San Francisco
$615Avianca
Tue, Sep 1 - Tue, Sep 15
Avianca Logo
9:40 am - 9:45 pmSJO  San José Juan Santamaria Intl-ONT Ontario
13h 05m1 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
$664Avianca
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?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights to Ontario, 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 to Ontario is January, where tickets cost $327 on average for return flights. On the other hand, the most expensive months are June and July, where the average cost of tickets from Costa Rica is $617 and $555 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 calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights to Ontario, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

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

$274
Best time to beat the crowds with an average 28% drop in price.
Most popular time to fly with an average 12% 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 980 direct flights from within Costa Rica to Ontario. The most common day for departures is Sunday, with 18% 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

 
See real verified KAYAK customer reviews for airlines flying to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from Costa Rica to Ontario. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
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 10113 reviews
6.7Food
7.7Boarding
7.3Comfort
8.1Crew
7.1Entertainment
Airline reviews

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

6.0 GoodAnonymous, Aug 2026
Read more United Airlines reviews

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

Flight be on time would be a good start. Then train your flight attendants to be attentive and friendly. This time they completely forgot my row for the measly snack! United, do better!

We boarded the plane and were about to take off when we were notified that the tires had to be checked. Upon inspection, they were found to need replacement, so the entire plane had to be deboarded. After we exited the plane, United staff forced us to stay in the gate area by posting "Do Not Exit" signs on the doors connecting the gate area to the terminal. Many of us had already rebooked our flights and had no checked bags, but they told us we could not leave. This seemed inappropriate to hold people under false pretenses. When the agent told us we could leave, I asked them to please take down the "Do Not Exit" signs, as they were misleading. The agent refused, and I told them that it didn't feel right to hold people like that.

It was a short, comfortable flight. It did leave an hour late due to the pilot having to be replaced (family emergency) but that didn’t inconvenience myself & my friend. The situation was explained, eventually.

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