$148 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 9/25. 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

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

Tue, Sep 16 - Tue, Sep 23
Avianca Logo
3:05 pm - 9:55 pmSJO-ONT
7h 50m1 stop
Avianca Logo
11:25 pm - 1:30 pmONT-SJO
13h 05m1 stop
$262Avianca
Find Deal
Thu, Sep 25 - Thu, Oct 2
Avianca Logo
9:35 am - 9:55 pmSJO-ONT
13h 20m1 stop
Avianca Logo
11:25 pm - 1:30 pmONT-SJO
13h 05m1 stop
$265Avianca
Find Deal
Mon, Oct 20 - Wed, Nov 5
United Airlines Logo
8:37 am - 10:52 pmSJO-ONT
15h 15m1 stop
United Airlines Logo
1:45 pm - 11:25 amONT-SJO
19h 40m2 stops
$267United Airlines
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Tue, Oct 21 - Thu, Oct 30
American Airlines Logo
6:44 am - 10:42 pmSJO-ONT
16h 58m1 stop
American Airlines Logo
11:59 pm - 6:16 pmONT-SJO
17h 17m1 stop
$283American Airlines
Find Deal
Sat, Nov 1 - Tue, Nov 11
American Airlines Logo
6:44 am - 6:52 pmSJO-ONT
13h 08m1 stop
American Airlines Logo
10:34 pm - 9:03 pmONT-SJO
20h 29m2 stops
$288American Airlines
Find Deal
Thu, Oct 23 - Wed, Nov 5
United Airlines Logo
1:30 pm - 8:24 pmSJO-ONT
31h 54m2 stops
United Airlines Logo
1:45 pm - 11:25 amONT-SJO
19h 40m2 stops
$327United Airlines
Find Deal
Tue, Oct 21 - Mon, Oct 27
Delta Logo
1:23 pm - 10:22 pmSJO-ONT
9h 59m1 stop
Delta Logo
10:00 pm - 11:58 amONT-SJO
12h 58m1 stop
$364Delta
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Sun, Feb 1 - Sat, Feb 7
 Logo
4:13 pm - 11:12 pmSJO-ONT
8h 59m1 stop
 Logo
1:02 am - 11:53 pmONT-SJO
20h 51m1 stop
Thu, Oct 9 - Wed, Oct 15
 Logo
3:05 pm - 9:55 pmSJO-ONT
7h 50m1 stop
 Logo
9:36 am - 11:35 pmONT-SJO
12h 59m2 stops
Tue, Dec 9 - Fri, Mar 20
Delta Logo
7:00 am - 7:42 pmSJO-ONT
14h 42m1 stop
Delta Logo
10:30 pm - 11:55 amONT-SJO
12h 25m1 stop
$491Delta
Find Deal
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 May, where tickets cost $387 on average for return flights. On the other hand, the most expensive months are October and February, where the average cost of tickets from Costa Rica is $649 and $630 respectively. For one-way flights, the best month to travel is May with an average price of $387.

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 26 weeks before departure.

Good to know

Low seasonMarch
Cheapest flight$148
Best time to beat the crowds with an average 7% drop in price.
Most popular time to fly with an average 30% 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.

  • What is the cheapest day to fly to Ontario?

    Based on KAYAK data, the cheapest day to fly to Ontario is Tuesday where round-trip tickets can be as cheap as $418. On the other hand, the most expensive day to fly is Wednesday, where round-trip prices are $660 on average.

  • 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.

  • What is the cheapest time of day to fly to Ontario?

    The cheapest time of day to fly to Ontario is generally in the evening, when round-trip flights cost $265 on average. The most expensive time of day to fly to Ontario is generally in the afternoon, which is peak travel time and where the average cost of a ticket is $645.

  • How many direct flights to Ontario are there each week?

    Each week there are around 552 direct flights from within Costa Rica to Ontario. The most common day for departures is Thursday, 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 airline 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 8945 reviews
8.1Crew
7.1Entertainment
6.6Food
7.3Comfort
7.7Boarding
Airline reviews

The flight was comfortable with the exit row and great service

10.0 ExcellentMark, Aug 2025HNL - LAX
Read more United Airlines reviews

The flight was comfortable with the exit row and great service

Plane was crowded and even when we hit altitude, the plane was hot, not enough air flow.

1. when we went to check in, our 2 first class seats had been CANCELED and the flight was sold out. This was done without our prior knowledge. It was all we could do to restore one first class seat for my wife and I flew economy. 2, Our flight home was scheduled to leave at 10:30 pm. Due to tsunami warnings, the roads were closed and our flight status was uncertain as to whether it would leave as scheduled. It was announced that it would now leave at 11:20 pm and the roads were now open since the tsunami had come and gone. We made a mad dash to the airport and checked in. Delays were announced at 12:30 pm, 1:30 am, 2:30 am and at 3:30 am it was canceled. Since this was a flight due to natural (tsunami) causes, there was no compensation. We were told to return at 1:00 pm the next day and our baggage would be kept on the plane since the same plane was going to leave at 1:00 pm. We had to return to our hotel for the rest of the night. The same plane did not leave at 1:00 pm and our baggage was gone! All in all, it was a miserable performance by UA. Information was hard to obtain and no one knew what was going on and what was going to happen. Hundreds of passengers slept on the floor, chairs, etc. No food and no water was made available to the passengers. It was a situation where UA could care less what was going on. As a one million mile flyer, I had not experienced anything like this before and it was hugely disappointing!

I found the staff to not be very attentive at all. When paying for Business Class you expect a certain type of service and that was not found. They were almost rude even

Ok. Get a different kosher caterer. The food was odd.

Our experience on United Airlines was extremely poor. The plane was extremely cold throughout our entire flight- which multiple people complained about- and we had to wait 2 hours to get a blanket which was too thin and barely helped warm us up. As well as this, none of the entertainment features were working so we had to sit through a roughly 10 hour flight with nothing to keep our attention, including the actual flight path screen. It was an extremely disappointing experience and I would hope that this gets fixed if we ever choose United Airlines again.

I really enjoyed flying with United airlines amazing experience , good customer service and great food

1.It will be better if sandwich is warm. 2.The food is too salty. 3.Breakfast needs some vegetables or fruits.

Boarded plane and then delayed 1.5 hours while on the plane

It was all good flight was on time, service was good I enjoyed a few movies and everything was smooth

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario

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