$169 Find Cheap Flights from Costa Rica to Ontario

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 1/26. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Ontario

 
These are the airlines KAYAK users have selected most often from within our search results for flights to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results for flights to Ontario, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$290
Overall average: $510
United Airlines
Thu 2/26Wed 3/4
SJO - ONT • 1 stop
Cheapest one-way
$169
Typical prices: $199-$343
United Airlines
Mon 1/26
SJO - ONT • 2 stops
When to travel
October
Cheapest • 14% price drop
December
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Ontario!
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, Feb 26 - Wed, Mar 4
United Airlines Logo
12:35 pm - 9:59 pm
SJO
-
ONT
11h 24m
1 stop
United Airlines Logo
6:37 pm - 8:32 am
ONT
-
SJO
11h 55m
1 stop
$290United Airlines
Thu, Feb 26 - Sat, Feb 28
United Airlines Logo
12:35 pm - 9:59 pm
SJO
-
ONT
11h 24m
1 stop
United Airlines Logo
1:53 pm - 8:32 am
ONT
-
SJO
16h 39m
1 stop
$299United Airlines
Fri, May 1 - Sat, May 9
United Airlines Logo
8:45 am - 9:43 am
SJO
-
ONT
25h 58m
1 stop
United Airlines Logo
6:54 pm - 7:15 am
ONT
-
SJO
11h 21m
1 stop
$301United Airlines
Tue, Mar 17 - Tue, Apr 28
United Airlines Logo
5:30 am - 6:07 pm
SJO
-
ONT
13h 37m
1 stop
United Airlines Logo
6:00 am - 7:37 pm
ONT
-
SJO
12h 37m
1 stop
$310United Airlines
Wed, Mar 18 - Tue, Mar 24
Multiple Airlines Logo
8:40 am - 10:57 pm
SJO
-
ONT
15h 17m
1 stop
Multiple Airlines Logo
11:59 pm - 11:56 am
ONT
-
SJO
10h 57m
1 stop
$314Multiple Airlines
Tue, Mar 17 - Tue, Apr 28
United Airlines Logo
5:30 am - 6:07 pm
SJO
-
ONT
13h 37m
1 stop
United Airlines Logo
1:34 pm - 10:11 am
ONT
-
SJO
19h 37m
2 stops
$315United Airlines
Fri, May 1 - Fri, May 15
United Airlines Logo
7:55 am - 9:01 pm
SJO
-
ONT
38h 06m
2 stops
United Airlines Logo
11:05 am - 7:15 am
ONT
-
SJO
19h 10m
1 stop
$321United Airlines
Fri, May 1 - Fri, May 15
United Airlines Logo
8:45 am - 9:43 am
SJO
-
ONT
25h 58m
1 stop
United Airlines Logo
11:05 am - 7:15 am
ONT
-
SJO
19h 10m
1 stop
$322United Airlines
Mon, Feb 2 - Fri, Feb 6
United Airlines Logo
6:30 am - 9:58 pm
SJO
-
ONT
17h 28m
1 stop
United Airlines Logo
6:00 am - 8:32 am
ONT
-
SJO
24h 32m
1 stop
$328United Airlines
Tue, Mar 17 - Tue, Apr 28
United Airlines Logo
5:30 am - 6:07 pm
SJO
-
ONT
13h 37m
1 stop
United Airlines Logo
1:27 pm - 7:15 am
ONT
-
SJO
16h 48m
1 stop
$329United 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?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for 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 October, where tickets cost $368 on average for one-way flights. On the other hand, the most expensive months are April and February, where the average cost of tickets from Costa Rica is $521 and $510 respectively. For return trips, the best month to travel is October with an average price of $368.

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 0 weeks before departure. For the absolute cheapest price, our data suggests you should book 3 days before departure.

Find deals

Good to know

Low seasonJanuary
Cheapest flight$169
Best time to beat the crowds but there is an average 7% 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 626 direct flights from within Costa Rica to Ontario. The most common day for departures is Friday, 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 airline 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 9163 reviews
7.3Comfort
8.1Crew
7.1Entertainment
6.6Food
7.7Boarding
Airline reviews

Yet another flight in which beverage and snack service was skipped. Other that that, firmly mediocre. Landed early, to gate late due to congestion at the gates. Airline's fault or airports fault: unknown.

6.0 GoodMichael, Jan 2026
PDX - SFO
Read more United Airlines reviews

Yet another flight in which beverage and snack service was skipped. Other that that, firmly mediocre. Landed early, to gate late due to congestion at the gates. Airline's fault or airports fault: unknown.

Both flights delayed. 2nd flight over 3 hours late mechanical issues

Flight was delayed 45 minutes because originating flight was coming from Newark. No complimentary snacks were offered on this 5+ hour flight. No screens for the flight, but movies offered if you had already downloaded the United app (which I hadn't on my ipad). No USB ports, only a flimsy plug-in port near the bottom of the seat that was hard to see and kept coming unplugged.

It was good but only meal served is very less. Meantime good to add rice and chicken in one of meal

Teeny tiny bathrooms, crew was not realistic about when we'd arrive.

On the way my flight entertainment wouldn’t work the screen went black and no matter how many times I tried to turn it on it wouldn’t. Food was surprisingly good but the tray tables were tiny so you couldn’t get anything else on the table. The seats hardly go back and are not overly comfortable. Wouldn’t fly United again.

Unbelievably poor service from flight attendants. They didn’t even do water service on a four hour flight. Just disrespectful.

Flight was late - I was downgraded from first class to coach

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

United needs to step up their game. Delayed flight leaving Seattle, San Francisco. Older aircraft, not very comfortable.

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario

Ontario (ONT)