$265 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 7/15. 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

Fri, Sep 4 - Tue, Sep 15
United Airlines Logo
7:55 am - 12:12 pm
SJO
-
ONT
29h 17m
2 stops
United Airlines Logo
7:13 pm - 12:21 pm
ONT
-
SJO
16h 08m
2 stops
$470United Airlines
Sat, Sep 19 - Mon, Sep 28
United Airlines Logo
8:45 am - 8:01 pm
SJO
-
ONT
12h 16m
1 stop
United Airlines Logo
6:00 am - 7:37 pm
ONT
-
SJO
12h 37m
1 stop
$480United Airlines
Wed, Jul 22 - Fri, Jul 31
American Airlines Logo
11:41 pm - 9:29 am
SJO
-
ONT
10h 48m
1 stop
American Airlines Logo
5:34 am - 10:38 pm
ONT
-
SJO
16h 04m
1 stop
$498American Airlines
Sat, Oct 17 - Tue, Oct 20
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
$530Avianca
Sat, Sep 19 - Fri, Sep 25
Multiple Airlines Logo
8:45 am - 6:11 pm
SJO
-
ONT
10h 26m
1 stop
Multiple Airlines Logo
1:49 pm - 7:15 am
ONT
-
SJO
16h 26m
1 stop
$539Multiple Airlines
Sat, Oct 31 - Sat, Nov 7
Avianca Logo
9:35 am - 9:55 pm
SJO
-
ONT
13h 20m
1 stop
Avianca Logo
10:30 pm - 11:25 am
ONT
-
SJO
10h 55m
1 stop
$548Avianca
Fri, Nov 6 - Fri, Jan 15
American Airlines Logo
2:39 pm - 2:04 pm
SJO
-
ONT
25h 25m
1 stop
American Airlines Logo
6:00 am - 11:43 pm
ONT
-
SJO
15h 43m
1 stop
$551American Airlines
Fri, Oct 2 - Tue, Oct 6
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
$706Multiple Airlines
Tue, Jul 7 - Tue, Jul 14
JetBlue Logo
2:00 pm - 10:35 pm
LIR
-
ONT
33h 35m
1 stop
JetBlue Logo
11:50 pm - 12:40 pm
ONT
-
LIR
11h 50m
1 stop
$739JetBlue
Wed, Jul 22 - Wed, Jul 29
JetBlue Logo
2:00 pm - 10:35 pm
LIR
-
ONT
33h 35m
1 stop
JetBlue Logo
11:50 pm - 12:40 pm
ONT
-
LIR
11h 50m
1 stop
$829JetBlue
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 flight to Ontario?

These are the best round-trip prices found by users searching on KAYAK in the last 72 hours.

In the last 3 days, the cheapest flight deal to Ontario was found on the route from San José, at $470 return. The most popular connection is from Seattle to Ontario and KAYAK users have found round-trip deals for as low as $151 in the last 3 days.

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 July and June, where the average cost of tickets from Costa Rica is $490 and $469 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$265
Best time to beat the crowds with an average 21% drop in price.
Most popular time to fly with an average 7% increase in price.
Flight from San José to Ontario

FAQs - booking Ontario flights

  • What is the cheapest flight to Ontario?

    In the last 3 days, the cheapest flight deal to Ontario was found on the route from San José, at $470 return. The most popular connection is from Seattle to Ontario and KAYAK users have found round-trip deals for as low as $151 in the last 3 days.

  • 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 999 direct flights from within Costa Rica to Ontario. The most common day for departures is Sunday, with 16% 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 9730 reviews
7.1Entertainment
8.1Crew
6.6Food
7.7Boarding
7.3Comfort
Airline reviews

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.

6.0 Goodrsillman, May 2026
ACV - SFO
Read more United Airlines reviews

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.

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

Outstanding service, great food, friendly & efficient crew, safe & comfortable flight

Staff were not attentive, wifi did not work, cut my head in the bathroom due to the position of the soap on the sink, had blood running down my face, told staff, they had no expression no sympathy, didn't even say "sorry", they said "oh we will have a look at that" about 10 mins later the purser brought me a bandaid, still no sorry.... Shocking

The crew was great. Very friendly and responsive. The plane was old, small and tight. We ran out of overhead space and I had to check. Middle seat was particularly tight.

The flight was delayed from take off because only one runway was operational in San Francisco.

Several missed and almost missed connections. It felt like everything was being patched together last minute without enough resources and it ended up being an extremely stressful experience that basically ruined our weekend on the west coast. What a waste.

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