$196 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 3/10. 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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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

Wed, Apr 29 - Mon, May 4
United Airlines Logo
11:13 am - 12:22 pm
SJO
-
ONT
26h 09m
2 stops
United Airlines Logo
10:37 am - 7:15 am
ONT
-
SJO
19h 38m
1 stop
$333United Airlines
Fri, Aug 14 - Sun, Aug 23
American Airlines Logo
2:15 pm - 11:53 am
SJO
-
ONT
22h 38m
2 stops
American Airlines Logo
4:54 pm - 1:50 pm
ONT
-
SJO
19h 56m
2 stops
$346American Airlines
Tue, Apr 14 - Tue, Apr 21
American Airlines Logo
12:10 pm - 10:09 am
SJO
-
ONT
22h 59m
2 stops
American Airlines Logo
11:59 pm - 9:36 pm
ONT
-
SJO
20h 37m
1 stop
$348American Airlines
Fri, Mar 13 - Sun, Mar 15
Multiple Airlines Logo
8:40 am - 10:57 pm
SJO
-
ONT
15h 17m
1 stop
Multiple Airlines Logo
6:15 am - 7:32 am
ONT
-
SJO
24h 17m
1 stop
$350Multiple Airlines
Tue, May 5 - Sat, May 9
Avianca Logo
3:10 pm - 9:45 pm
SJO
-
ONT
7h 35m
1 stop
Avianca Logo
11:35 pm - 8:45 am
ONT
-
SJO
8h 10m
1 stop
$352Avianca
Fri, May 1 - Fri, May 15
United Airlines Logo
1:25 pm - 5:52 pm
SJO
-
ONT
29h 27m
2 stops
United Airlines Logo
6:00 am - 7:15 am
ONT
-
SJO
24h 15m
1 stop
$367United Airlines
Thu, Aug 20 - Thu, Aug 27
Avianca Logo
9:40 am - 9:45 pm
SJO
-
ONT
13h 05m
1 stop
Avianca Logo
11:35 pm - 8:45 am
ONT
-
SJO
8h 10m
1 stop
$389Avianca
Wed, May 6 - Sat, May 9
Avianca Logo
7:45 pm - 9:45 pm
SJO
-
ONT
27h 00m
1 stop
Avianca Logo
11:35 pm - 8:45 am
ONT
-
SJO
8h 10m
1 stop
$390Avianca
Fri, May 1 - Wed, May 13
United Airlines Logo
1:25 pm - 12:22 pm
SJO
-
ONT
23h 57m
2 stops
United Airlines Logo
6:00 am - 7:37 pm
ONT
-
SJO
12h 37m
1 stop
$391United Airlines
Wed, Aug 26 - Sat, Aug 29
Avianca Logo
7:45 pm - 9:45 pm
SJO
-
ONT
27h 00m
1 stop
Avianca Logo
11:35 pm - 11:30 am
ONT
-
SJO
10h 55m
1 stop
$398Avianca
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 January, where tickets cost $317 on average for one-way flights. On the other hand, the most expensive months are June and March, where the average cost of tickets from Costa Rica is $493 and $462 respectively. For return trips, the best month to travel is January with an average price of $317.

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 6 days before departure.

Good to know

Low seasonJanuary
Cheapest flight$185
Best time to beat the crowds with an average 21% drop in price.
Most popular time to fly with an average 16% 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 542 direct flights from within Costa Rica to Ontario. The most common day for departures is Friday, with 15% 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 9375 reviews
7.7Boarding
6.6Food
8.1Crew
7.3Comfort
7.1Entertainment
Airline reviews

It was amazing. I had several upgraded seats on my flight out. Everything went smooth with no delays.

10.0 ExcellentEric, Mar 2026
NRT - LAX
Read more United Airlines reviews

It was amazing. I had several upgraded seats on my flight out. Everything went smooth with no delays.

Flight delayed for more than 16 hrs and no effort was spent to provide an alternate

Flight attendants were friendly & good service, food sucks, seats uncomfortable, not many Asian movies or shows flying from Hong Kong

Flight attendants had a little attitude. Food tastes no good.

Overall we had a good experience during our flight from San Francisco to Houston.

it was a very short flight so my expectations were low.

Good flight. However, when booked flight with United, assumed the layover included by United in San Francisco of 1 hr and 40 minutes was sufficient . Not so and would recommend at least 2 hours or more. Needed to go through US immigration (very long lineups), then pick up bags, take all the way to another terminal, running because we did not have sufficient time. We made the flight because they held the door for us but luggage didn’t follow.

Very disappointing given gate agent behavior. Filed a formal complaint with United.

Flight delayed. WiFi connectivity very poor if not existant. Last minute arrival forced me to run to catch my connection.

The power at the seat didn't work and the seat itself was difficult to adjust - this was a business class seat. Flight attendant gave me miles to compensate. The attendant was very professional and on top of his game the entire flight.

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.

I actually upgraded to the medium level of seats from basic and even doing that it may have been physically the most uncomfortable flight I have ever had. They packed everyone like is a train to death camp. It was a red eye so I hoped to get some sleep but it was physically impossible to find a comfortable way to rest. I met other folks on the same flight and they said the same thing. It was an utterly miserable flight and if I have any other options I will never fly with them again

Boarding was late due to the company’s that cleaned the aircraft (very poorly done) and the catering company. The entertainment system was not working for this six hour flight, uncomfortable seats in business (barely any cushion or recline). The airline staff is very good but the planes are horrible and not well maintained.

Here we have another airline flying to Guatemala but doesn't have a plus or a less, just in the middle. Why? Well, first we don't have even free water Movie selection is poor Seats don't recline in some places Food selection is carb based Forgot to mention, customer service on the web is the worst. Good things; Very reliable on schedule Kind crew

Last seat of Bussines Class it does recline but passenger seating behind kept pushing since they did not have space once my seat was reclined

I handed in my suitcase in perfect condition at SAL Airport. And in MIA Airport I received it with one corner broken and the wheels bent.

I like the crew members they're very friendly. Clean plane. The flight was on time. I dont like the comfort my car seat its better that the plane seats. They charge for everything. This airline was very good. Now it's a low cost airline

I couldnt recline the seat. Other than that crew was very attentive and helpful. Thsnk you

6 hour flight and have to pay for everything 100 dollars to add a carry-on bag is insane

The check in is the only positive thing in Avianca. The seat is the most uncomfortable I have traveled, the distance is minimal.

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario