$195 Find Cheap Flights from Ontario to Costa Rica

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Costa Rica departing on 5/29. 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

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Cheap Flights from Ontario to Costa Rica

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
San José
San José2 stops$499
Liberia
Liberia1 stop$610
San José
San José2 stops$499
Liberia
Liberia1 stop$610

Book Cheap Ontario to Costa Rica Plane Tickets

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

Fri, Sep 18 - Fri, Sep 25
American Airlines Logo
12:35 pm - 11:05 am
ONT
-
SJO
21h 30m
2 stops
American Airlines Logo
12:57 pm - 11:06 pm
SJO
-
ONT
11h 09m
1 stop
$499American Airlines
Tue, Aug 11 - Sun, Aug 16
American Airlines Logo
2:27 pm - 11:34 am
ONT
-
SJO
20h 07m
2 stops
American Airlines Logo
1:29 pm - 9:34 am
SJO
-
ONT
21h 05m
2 stops
$504American Airlines
Tue, May 12 - Sat, May 30
Avianca Logo
11:35 pm - 8:45 am
ONT
-
SJO
8h 10m
1 stop
Avianca Logo
3:10 pm - 9:45 pm
SJO
-
ONT
7h 35m
1 stop
$508Avianca
Mon, Sep 28 - Mon, Oct 19
American Airlines Logo
12:35 pm - 11:05 am
ONT
-
SJO
21h 30m
2 stops
American Airlines Logo
12:57 pm - 11:48 am
SJO
-
ONT
23h 51m
1 stop
$509American Airlines
Fri, Sep 18 - Fri, Sep 25
Southwest Logo
5:40 am - 6:40 pm
ONT
-
SJO
12h 00m
2 stops
Southwest Logo
9:00 am - 8:40 pm
SJO
-
ONT
12h 40m
2 stops
$514Southwest
Sat, Sep 12 - Thu, Sep 17
Avianca Logo
11:35 pm - 11:30 am
ONT
-
SJO
10h 55m
1 stop
Avianca Logo
3:10 pm - 9:45 pm
SJO
-
ONT
7h 35m
1 stop
$516Avianca
Mon, Jun 1 - Sat, Jun 6
American Airlines Logo
2:18 pm - 1:09 pm
ONT
-
SJO
21h 51m
2 stops
American Airlines Logo
11:59 pm - 6:21 pm
SJO
-
ONT
19h 22m
2 stops
$519American Airlines
Sun, Aug 2 - Sun, Aug 9
American Airlines Logo
10:10 pm - 1:00 pm
ONT
-
SJO
13h 50m
1 stop
American Airlines Logo
1:29 pm - 9:34 am
SJO
-
ONT
21h 05m
2 stops
$524American Airlines
Tue, May 26 - Thu, Jun 4
JetBlue Logo
10:41 pm - 12:40 pm
ONT
-
LIR
12h 59m
1 stop
JetBlue Logo
2:00 pm - 8:47 pm
LIR
-
ONT
31h 47m
1 stop
$614JetBlue
Tue, Jun 2 - Tue, Jun 9
JetBlue Logo
10:41 pm - 12:40 pm
ONT
-
LIR
12h 59m
1 stop
JetBlue Logo
2:00 pm - 8:47 pm
LIR
-
ONT
31h 47m
1 stop
$631JetBlue
Booking Insights

KAYAK's insights & trends for Ontario to Costa Rica flights

Get data-powered insights and trends into flights from Ontario to Costa Rica to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Ontario to Costa Rica?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Costa Rica, 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 from Ontario to Costa Rica is February, when tickets cost $119 (return) on average. On the other hand, the most expensive months are July and March, when the average cost of round-trip tickets is $436 and $393 respectively.

Good to know

Low seasonFebruary
Cheapest flight$206
Best time to beat the crowds but there is an average 4% increase in price.
Most popular time to fly with an average 11% increase in price.
Flight from Ontario to Liberia

FAQs - booking Costa Rica flights

  • How does KAYAK find such low prices on flights from Ontario to Costa Rica?

    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 from Ontario to Costa Rica.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Costa Rica?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Ontario to Costa Rica is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Costa Rica?

    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 from Ontario to Costa Rica 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 from Ontario to Costa Rica?

    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 from Ontario to Costa Rica up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines serving from Ontario to Costa Rica

 
Need help choosing which airline to fly with from Ontario to Costa Rica? 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 9681 reviews
7.3Comfort
7.7Boarding
7.1Entertainment
6.6Food
8.1Crew
Airline reviews

Some crew were unfriendly or in some cases just straight up rude.

6.0 GoodAnonymous, Apr 2026
SFO - YVR
Read more United Airlines reviews

Some crew were unfriendly or in some cases just straight up rude.

Booked through Kayak Business, had a seat in middle and towards back due to booking rate, not comfortable.

Outstanding service, efficient & friendly crew, flight was safe, comfortable & on time

United Airline crews were very friendly and very attentive. 12 hours flight was gone like in a shorter one.

Food was surprisingly delicious. Space in the seat is horrible when the seating front is reclined. Movie offerings were terrible. Crew was friendly and helpful.

Flight itself excellent, but delayed so missed connection & got to destination 2 hrs later

Due to cancellation of connecting flight (Lufthansa) I didn’t fly with United

It was a red-eye, but the flight felt surprisingly quick. The seats were very comfortable, and that made resting much easier. I also want to thank the gentleman seated next to me, who graciously moved so my mom could sit beside me. We slept almost the entire way. The cabin crew was respectful in not disturbing us, while also being courteous and professional throughout. Thank you, United.

Boarding was again a "free for all". We were boarding group 4, and almost the entire plane was able to board before us. It's a shame that someone who follows the rules, gets the short end of the stick. Not fair.

It was perfect! I've never flown with United before, but I definitely will in the future

Left early arrived early..right amount of talking from pilots..of course had to love the biscuit and water!

Boarding gate at LAX was too crowded—two gates next to one another

On time departure and early arrival. Flight attendant very nice.

The business class layout of chairs was weired. You are sitting directly across stranger.,

The SFO Lounge crew were amazing. The bartender Faris was great. Thanks!

Friendly crew is the only nice thing. Seats uncomfortable. Food and snacks horrible. Movies were the same as the first 10 hour flight two weeks before

Was not able to do a online check-in because the American Airlines system doesn't store our visa or other passport information, allowing us to have a trouble-free check-in. We were forced to have to check-in at the counter which Changes are upgrade status given that we were not able to check in much earlier.

Good flight, seated and had a water within 5 minutes. Crew was hospitable.

We left at 1030 am pacific from LA and supposed to land at 7 pm Eastern in NY. They made a detour, stopped in Philadelphia and didn’t land till 1130 PM Eastern!!! Worst flight experience with no pilot communication with no explanation as to what was going on. Everyone was very frustrated to say the least.

I cancelled my ticket less than 24 hours deadline but I didn’t get refunded.

They should provide water to passengers who ask for it

The worst experience I've ever had because the "people" @ Avianca wouldn't let me fly because they said I needed a round trip ticket

Seating was tight. Seats don't recline. Initial flight was cancelled. Lost two days of vacation.

I had bad experiences before now was excellent I am glad they have business class again

It was delayed and I lost my connection flight to Cali and I missed my Mom's funeral

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

Not good, tried to purchase a first class upgrade and they couldn’t get it done. Was super uncomfortable the whole time.

Deplaning was a mess, I sat in business (seats are horrible) and the front door had a problem so we had to deplane from the rear exit. The stairs were not tall enough to reach so there was a large step down from the plane to the top of the stairs.

Staff are the rudest in the industry … awful customer service … will never fly Avianca again

Pros: we leave and arrive on time Cons: the most uncomfortable seats ever. You cant recline at all your seats. No entertainment No TVs flight attendants didn't provide even a glass of water. You have to go to back of the airplane and ask for one. I am Colombian and I remember seeing the flight attendants very neat, elegants which is or was a staple of Avianca.it was one with tennis shoes, no male up, the hair was messy... that was really odd.

Everything you need to know for your flight from Ontario to Costa Rica

Information on your arrival and departure airports