$307 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 10/2. 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
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 24% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

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

Tue, Sep 15 - Tue, Oct 20
Southwest Logo
1:40 pm - 10:05 pm
SJO
-
ONT
9h 25m
1 stop
Southwest Logo
4:40 pm - 6:00 am
ONT
-
SJO
12h 20m
1 stop
$541Southwest
Tue, Sep 15 - Tue, Oct 20
Southwest Logo
9:00 am - 8:55 pm
SJO
-
ONT
12h 55m
2 stops
Southwest Logo
6:25 pm - 6:00 am
ONT
-
SJO
10h 35m
2 stops
$545Southwest
Wed, Sep 30 - Wed, Mar 31
United Airlines Logo
1:20 pm - 9:58 pm
LIR
-
ONT
9h 38m
1 stop
United Airlines Logo
5:00 am - 3:19 pm
ONT
-
LIR
9h 19m
1 stop
$565United Airlines
Fri, Nov 6 - Mon, Nov 9
United Airlines Logo
8:35 am - 9:21 pm
LIR
-
ONT
14h 46m
1 stop
United Airlines Logo
6:02 am - 6:37 pm
ONT
-
LIR
10h 35m
1 stop
$574United Airlines
Tue, Sep 15 - Tue, Oct 20
Southwest Logo
1:40 pm - 10:05 pm
SJO
-
ONT
9h 25m
1 stop
Southwest Logo
4:40 pm - 6:00 am
ONT
-
SJO
12h 20m
1 stop
$574Southwest
Wed, Sep 30 - Wed, Feb 24
Copa Airlines Logo
1:20 pm - 9:58 pm
LIR
-
ONT
9h 38m
1 stop
Copa Airlines Logo
6:02 am - 6:37 pm
ONT
-
LIR
10h 35m
1 stop
$578Copa Airlines
Tue, Sep 15 - Tue, Oct 20
Southwest Logo
9:00 am - 8:55 pm
SJO
-
ONT
12h 55m
2 stops
Southwest Logo
6:25 pm - 6:00 am
ONT
-
SJO
10h 35m
2 stops
$578Southwest
Thu, Sep 24 - Tue, Sep 29
Multiple Airlines Logo
1:20 pm - 9:58 pm
LIR
-
ONT
9h 38m
1 stop
Multiple Airlines Logo
1:18 pm - 12:10 pm
ONT
-
LIR
21h 52m
2 stops
$595Multiple Airlines
Thu, Oct 1 - Fri, Feb 26
Avianca Logo
1:20 pm - 9:58 pm
LIR
-
ONT
9h 38m
1 stop
Avianca Logo
5:00 am - 4:08 pm
ONT
-
LIR
9h 08m
1 stop
$599Avianca
Sat, Jun 27 - Tue, Jul 7
Multiple Airlines Logo
7:00 am - 11:05 pm
SJO
-
ONT
17h 05m
2 stops
Multiple Airlines Logo
12:55 am - 9:56 pm
ONT
-
SJO
20h 01m
2 stops
$604Multiple 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 January, where tickets cost $322 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 $498 and $490 respectively. For one-way flights, the best month to travel is January with an average price of $322.

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 22 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$307
Best time to beat the crowds with an average 23% drop in price.
Most popular time to fly with an average 5% increase in price.
Flight from Liberia 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 1,304 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 9776 reviews
8.1Crew
7.3Comfort
7.1Entertainment
7.7Boarding
6.6Food
Airline reviews

New plane was lovely. Crew customer service is always lax but expected. Kraft on time and arrived safely.

10.0 ExcellentKaryn, Jun 2026
DEN - LAX
Read more United Airlines reviews

New plane was lovely. Crew customer service is always lax but expected. Kraft on time and arrived safely.

Uncomfortable plastic seats even in premium economy. No free wifi. Even paid wifi was spotty to nonexistent. Bad food. Much worse than economy on foreign carriers like Qantas.

How can you rate a flight when it is canceled after you leave the gate & 3 hours into sitting there or in remote area of airport after mechanical problems

Seat pitch is horrible especially on the 15 hour flight. Gate crew at SFO was Outstanding. The flight crew was also great.

6 1/2 hours from Tampa to SFO on a Boeing 737. Cramped. No Service. No real food. One pass for coffee at the beginning and a second pass THREE hours later. And check-in in Tampa was nasty even by United standards. And I am at almost TWO million miles on United. It's a non-stop. But terrible service.

First class ticket gets you no seat back entertainment? I have to bring my own laptop to see a movie? And most of their movies have ADS? No thank you. Worse: Tiny snacks only on a 2 hr flight?

Late plane. Only one crew on the ground so we b had to wait for Denver flight to come in, board, and depart. At 78 yrs of age I was not pleased trying to get my connection. What really made me angry was the notification you sent me to hurry up or I would miss my connection. Why tell me to hurry up when you got me in late. It was not a good way of treating customers.

No complaints other than luggage carousel was incorrectly guiding passengers to the wrong carousel on the screen.

Seats were not super comfortable and food was not good at all. If I had a chance I would definitely fly a different airline. Of course they are better than any budget airline, but not by much.

Flew steerage class. Short on leg room unless you pay more. No window unless you pay more. Etc. United is trying to squeeze every cent from you. It doesn’t make for any loyalty.

The employees at the gate were not communicating, they preferred to give the upgrade to pilots and not to the elite passengers Every flight I more disappointing, clients shooed be priority instead of other employees even if they are pilots, there was plenty room for pilots in economy

This was my first time flying with you guys and my very last! This was the most horrible experience!!! There was not even tv in the plane! How cheap can this airline be!!! I paid so much for my suitcase!!! I would never fly with this airline again! The crew are very rude!

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 delayed and I lost my connection flight to Cali and I missed my Mom's funeral and avianca lost my check in luggage

Avianca has transitioned from full service legacy airline to "low cost" but has now became a strange hybrid (minimum leg space, started offering business class in domestic flights again, charges passenger for printing boarding pass, etc.). National and international coverage and destinations are really wide but service is not at its best

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

Not even water is offered on the flight. You cannot lean back on the seats and the seats are so narrow you can’t avoid rubbing elbows with the person next to you.

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

Horrible experience. Flight cancelled. Arrived at destination 12 hs later. No one gave us an answer or any information. Very very poor service. We won’t ever travel again with Avianca

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario