$155 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 6/23. 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

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Best Costa Rica Flight Deals from Ontario

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
San José
San José1 stop$354
Liberia
Liberia2 stops$541
San José
San José1 stop$354
Liberia
Liberia2 stops$541

Cheap Flights from Ontario to Costa Rica (ONT-CR0)

 
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

Sun, Aug 17 - Sat, Aug 23
American Airlines Logo
11:59 pm - 6:15 pmONT-SJO
17h 16m1 stop
American Airlines Logo
2:15 pm - 9:59 amSJO-ONT
20h 44m2 stops
$354American Airlines
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Tue, Jul 8 - Tue, Nov 18
Avianca Logo
11:25 pm - 1:30 pmONT-SJO
13h 05m1 stop
Avianca Logo
5:05 am - 9:00 pmSJO-ONT
17h 55m1 stop
$417Avianca
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Fri, Oct 3 - Tue, Oct 14
American Airlines Logo
10:35 pm - 8:09 pmONT-SJO
20h 34m2 stops
American Airlines Logo
1:53 pm - 12:02 amSJO-ONT
11h 09m1 stop
$419American Airlines
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Mon, Nov 17 - Sat, Dec 6
United Airlines Logo
3:15 pm - 8:15 amONT-SJO
15h 00m1 stop
United Airlines Logo
2:20 pm - 9:21 pmSJO-ONT
9h 01m1 stop
$434United Airlines
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Fri, Aug 1 - Tue, Aug 19
United Airlines Logo
6:00 am - 7:37 pmONT-SJO
12h 37m1 stop
United Airlines Logo
8:37 am - 5:37 pmSJO-ONT
10h 00m1 stop
$440United Airlines
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Thu, Aug 28 - Tue, Sep 2
Avianca Logo
11:25 pm - 11:15 amONT-SJO
10h 50m1 stop
Avianca Logo
9:35 am - 9:55 pmSJO-ONT
13h 20m1 stop
$451Avianca
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Mon, Jul 28 - Tue, Aug 5
Delta Logo
10:05 pm - 12:00 pmONT-LIR
12h 55m1 stop
Delta Logo
1:25 pm - 10:27 pmLIR-ONT
10h 02m1 stop
$551Delta
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Tue, Jul 29 - Tue, Aug 5
Delta Logo
5:09 pm - 12:00 pmONT-LIR
17h 51m2 stops
Delta Logo
1:25 pm - 10:27 pmLIR-ONT
10h 02m1 stop
$555Delta
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Sat, Jun 7 - Sat, Jun 14
Southwest Logo
9:20 pm - 11:35 amONT-LIR
13h 15m1 stop
Southwest Logo
2:10 pm - 11:00 pmLIR-ONT
9h 50m1 stop
$737Southwest
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Sat, Jun 7 - Sat, Jun 14
Southwest Logo
4:35 pm - 1:05 pmONT-LIR
19h 30m2 stops
Southwest Logo
2:10 pm - 11:00 pmLIR-ONT
9h 50m1 stop
$742Southwest
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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 October, when tickets cost $413 (return) on average. On the other hand, the most expensive months are December and February, when the average cost of round-trip tickets is $763 and $673 respectively.

What’s the cheapest day of the week to fly from Ontario to Costa Rica?

The average price of all round-trip flights from Ontario to Costa Rica clicked on KAYAK for each day over the last 12 months.

For Ontario to Costa Rica, Monday is the cheapest day to fly on average and Friday is the most expensive. Flying from Costa Rica back to Ontario, the best deals are generally found on Tuesday, with Wednesday being the most expensive.


Good to know

Low seasonMarch
High seasonJanuary
Cheapest flight$155
Best time to beat the crowds with an average 20% drop in price.
Most popular time to fly and prices are also 6% lower on average.
Flight from Ontario to San José

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.

  • What is the cheapest time of day to fly to Costa Rica?

    The cheapest time of day to fly to Costa Rica is generally at night, when round-trip flights cost $473 on average. The most expensive time of day to fly to Costa Rica is generally in the morning, which is peak travel time and where the average cost of a ticket is $669.

Top 4 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.
8.0
SouthwestOverall score based on 4288 reviews
8.6Crew
7.1Food
8.0Comfort
8.2Boarding
7.6Entertainment
Airline reviews

It was a perfect flight in all aspects! Both legs!

10.0 ExcellentAnonymous, Apr 2025LGB - SMF
Read more Southwest reviews

It was a perfect flight in all aspects! Both legs!

Great flight, 47 passengers on a 180 seat plane. Stewardess was pleasant and cheerful.

I liked the crew member who gave flight instructions on "in case of a problem:. The seats are so small that only a young teenager could sit in middle seat.

Great flight staff. Ease of boarding. Overall, very uneventful and easy trip.

Employees were kind and funny, as always! Flight was late but no announcements were made for people with tight connections to help them transition quickly. No service due to turbulence.

I recently flew Southwest from San Jose to Honolulu. I was very impressed with the flight crew, especially the flight attendant in charge of the front of the plane. She came through the aisle at least five times for drinks and water, and two times for snacks. I have not seen such service since I flew first class. Also, for the first time, they gave us the correct baggage claim number, and the luggage came out quickly. I can't wait for Southwest to have assigned seating! I absolutely hate the Cattle Call boarding procedure and the mad dash to get seats and overhead bins. However, the boarding was efficient.

We had a nice flight. Boarding was easy, our seats were comfortable and the on board service was pleasant.

Service was great, boarding and exiting went smoothly, and the flight was very pleasant.

Was as expected. Crowed planes. Too many carryons delaying takeoff. But the ride only took an hour and saved me a lot of time SFO is a not a great airport.

Was as expected. Crowed planes. Too many carryons delaying takeoff. But the ride only took an hour and saved me a lot of time SFO is a hell hole of an airport. It is the new LaGuardia. Everything Cobbled together. Security gates closed. Terri directional signage

Breakfast was not loaded at SFO due to catering company change. Seems like a major airline at a major hub would have thought of something else or warned passengers to pick up food before boarding a 3 hour flight.

Boarding seemed to be organized bedlam. For what ever reason, preboarding took longer than 20 minutes. Made the plane 20 minutes late taking off. Luckily we arrived on time. Flight crew seemed very friendly. Only slight turbulence.

They hired a new catering company the same day of my flight. They botched the job by not delivering the right carts and after THREE HOURS waiting, the flight crew timed out (flight was 19 hours long and FAA rules state crew can’t work more than 14 hours long). So they CANCELED OUR FLIGHT!! Worst experience ever. Avoid UAL at all costs.

The personnel were professional and friendly. The Boeing 737 Max 9 is too claustrophobic and was very warm at both airport gates, and still warm in the air.

While the staff was pleasant and helpful, the following observations are for your awareness. There was some delay on the tarmac on take off and landing. The paid lunch/food offerings were limited. Entertainment was only available on WiFi at a cost.

get E+, a must for 5 hours flight if you are tall

The first flight was better in terms of the aircraft.

Liked fold flat bed. Didn’t like having no window. Didn’t like poor choice of food and being served dinner very late, hours after take off of a 7:40pm flight. Servers not friendly. Food horrible in business class.

Everything is good except the dinner and breakfast. The sandwich is very delicious. Toilet is clean, I only use one of them. Flight attendants are very nice. 👍👍

The gate was too far away for the connecting flight

Eventless. It was a good flight and good crew. Can’t complaint.

Very helpful ground crew after an earlier flight delay and being rebooked on a different flight.

British Airways staff are very polite and willing to help.

The plane was late and then sat on the runway for almost 45 minutes before taking off.

We kept being told that the flight was full and that all overhead compartments were full and therefore had to check in our hand luggage. We were some of the last people to board and noticed that there was still sufficient space in the overhead compartments. We were obliged to check in hand luggage when there was space and so had to wait at luggage retrieval which took a while to then noticed damage to our luggage - not a great experience!

Worst seats I’ve ever had !!! The seats were very narrow and uncomfortable and misaligned with the seats in front of mine leading to bottom of the seat in front of mine pressing on my legs for 15.5 hours !

This was an overnight flight. There was no meal service in first class, just a simple snack basket was offered along with beverages. There should have been some type of continental breakfast prior to arrival in PHL. As an Executive Platinum American Airlines Advantage member, I received no name recognition from the first class flight attendant. When disembarking at PHL, the flight attendants were more interested in their cell phones than saying "thank you" to the passengers as they disembarked.

The flight was quick and to the point. The crew just did their job w/o excessive talking and everything was just perfect.

Awkward carry on process. Forced to check all carry on. No overhead space of worthiness. Left delayed, but made up the time. Crew was amicable.

Amazingly comfy flight - I had upgraded for a reasonable price and it was worth it. The food also was good.

I receive a service for what I pay, so it is fair.

Excellent flight and one of the smoothest landing I’ve ever experienced

There isn't much space in-between seats and even water needs to be paid for during the flight.

We did not know about the bag fees until check in. They are way too high. It’s insane. We also had a huge delay and everything costed extra which was very annoying.

Lounge for business was closed. Boarding was rush and stand by. Seat for business is just the middle seat blocked and some more leg room.

Flew with our two children. Paid $380 to check two bags (one was overweight). They then left the bags behind on Sunday, December 21st, with all our family’s clothes and family Christmas presents. When we arrived at our destination they told us the bags had not arrived, and they thought (but didn’t know) they were still in Boston, but that there’d be a flight the next day and the bags would arrive the next day. The next day we found out there was no flight, now we’re hoping we get our bags before we fly back out. Meanwhile, trying to get any engagement or accurate information is a waste of time. The folks at the call center are just gatekeepers, who can’t connect with any departments that actually do things to solve a problem. Getting information is made deliberately difficult. My biggest regret is that I’ve had a number of awful experiences with Avianca traveling between the US and Colombia, and still let myself get suckered into buying these tickets because the schedule was great. Never again.

We were not aware carry-on bags cost extra until we arrived at the airport so, we were charged $240.00 for two small carry- on bags! There was a substantial fee for drinks and snacks. No wifi, or other entertainment was available. Waiting areas were crowded and uncomfortable.

I enjoyed it! In that case, I should have been offered this choice. On my first trip to Miami, I was asked to pay $320 for my luggage just for getting it totally broken. I cannot accept this situation at all!!!!

The connection time is too short to pass through customs and once you do clear customs the connecting flight is in another terminal that is not close.

They charged me $120 to check one bag and then charged me another $120 for a carryon. Ridiculous!

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

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