$186 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 5/31. 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.
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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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Flights 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

Thu, Jul 24 - Mon, Jul 28
United Airlines Logo
5:30 am - 10:52 pmSJO-ONT
18h 22m2 stops
United Airlines Logo
6:39 pm - 10:11 amONT-SJO
14h 32m2 stops
$324United Airlines
Find Deal
Wed, Jul 23 - Thu, Jul 31
United Airlines Logo
8:45 am - 10:52 pmSJO-ONT
15h 07m1 stop
United Airlines Logo
6:00 am - 10:39 pmONT-SJO
15h 39m1 stop
$333United Airlines
Find Deal
Wed, Sep 24 - Sat, Oct 4
Delta Logo
1:18 pm - 10:41 pmSJO-ONT
10h 23m1 stop
Delta Logo
10:59 pm - 11:53 amONT-SJO
11h 54m1 stop
$343Delta
Find Deal
Wed, Sep 24 - Wed, Oct 1
Delta Logo
1:18 pm - 10:41 pmSJO-ONT
10h 23m1 stop
Delta Logo
10:59 pm - 11:53 amONT-SJO
11h 54m1 stop
$344Delta
Find Deal
Tue, Sep 23 - Sat, Oct 4
American Airlines Logo
7:35 am - 9:56 pmSJO-ONT
15h 21m1 stop
American Airlines Logo
11:59 pm - 5:30 pmONT-SJO
16h 31m1 stop
$377American Airlines
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Wed, Aug 13 - Fri, Aug 22
American Airlines Logo
2:35 pm - 9:59 amSJO-ONT
20h 24m2 stops
American Airlines Logo
11:59 pm - 6:15 pmONT-SJO
17h 16m1 stop
$415American Airlines
Find Deal
Sat, Jun 7 - Fri, Jun 13
 Logo
3:31 pm - 11:13 pmSJO-ONT
8h 42m1 stop
 Logo
1:09 am - 11:14 pmONT-SJO
21h 05m1 stop
Fri, Oct 31 - Sat, Nov 22
 Logo
1:13 pm - 10:41 pmSJO-ONT
10h 28m1 stop
 Logo
12:58 am - 11:56 pmONT-SJO
20h 58m1 stop
Sat, Jul 5 - Thu, Jul 10
Avianca Logo
9:35 am - 9:55 pmSJO-ONT
13h 20m1 stop
Avianca Logo
11:25 pm - 1:30 pmONT-SJO
13h 05m1 stop
$522Avianca
Find Deal
Mon, Sep 1 - Thu, Sep 11
Avianca Logo
1:55 am - 9:55 pmSJO-ONT
21h 00m2 stops
Avianca Logo
11:25 pm - 11:15 amONT-SJO
10h 50m1 stop
$551Avianca
Find Deal
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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 $660 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
High seasonDecember
Cheapest flight$186
Best time to beat the crowds with an average 9% drop in price.
Most popular time to fly and prices are also 2% lower on average.
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 907 direct flights from within Costa Rica to Ontario. The most common day for departures is Friday, 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.

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 8744 reviews
6.6Food
7.7Boarding
7.0Entertainment
7.3Comfort
8.1Crew
Airline reviews

United out of SFO is having issues with catering so none of our meals were loaded on the plane and no offer of compensation for our tickets purchased was offered.

6.0 Goodmichael, May 2025HNL - SFO
Read more United Airlines reviews

United out of SFO is having issues with catering so none of our meals were loaded on the plane and no offer of compensation for our tickets purchased was offered.

Its good expeince but in enternteiment please be like you tube the music i like or movie

I needed to make changes to my flights. When I called customer service, they assisted me with care professionalism.

A bit rush for transit. Food and entertainment are not available

Wonderful and fast TSA checkpoint. The line was fast and our gate was close by

The gate was too far away for the connecting flight

Generally good. The aisles have gotten narrower which can slow down boarding. Flight crew was great! Healthier complimentary snacks would be appreciated. Due to earthquake in San Francisco we had to circle in air space for a bit but then had a smooth landing. I laud the flight crew for their patience ;)

We tried to upgrade to economy premium but were told this was not possible as we had booked through United Airlines (and Air Canada was operating the flight). This seemed silly given there was ample space in economy premium. Additionally, we had to wait almost 1.5 hours upon arrival to taxi to the gate. Otherwise, the crew were very pleasant and passengers were friendly.

headphone jack didnt work for the first flight and not much variety

The agents was very rude and they charged me $50 for a carry-on bag saying that it was too big and then I saw someone going on a plane with the same size bag as me

One bottle of water and a package of cookies for comfort plus. We had to literally beg a flight attendant for an extra bottle of water later in the flight due to feeling dehydrated.

Flight boarded from Gate 39 at OGG, the farthest gate in the terminal. There were no Hawaiian themed amenities for the flight. The first class service was mediocre at best; I received not special welcome or recognition as an executive platinum member of American Advantage program. The flight attendants were more concerned with their cell phones than saying "thank you" to the passengers as we disembarked. Fortunately, the flight arrived at LAX a few minutes early.

Bigger seats. Board back to front! Disembark front to back!

Extraordinary service in business class, and very good breakfast and snacks. A really lovely flight.

This flight didn’t happen because AA agents didn’t let us board the flight

Plane was pretty clean, staff was friendly and helpful, flight left about on time arrived early. Took a long time to board and get off the plane - carry on items didn't have enough room so people had to move all around to find places.

The service and food needs to improve to catch up with other international flights

Would have been good to have a meal since it was a 5.5 hour flight

We boarded after several delays due to mechanical failure and a gate change. The seat cushion in the exit row was very compressed and offered no cushion, making the four-hour journey reasonably uncomfortable. The WiFi worked for a few people, but for most, it did not, and you cannot get entertainment unless you can connect—American Airlines flights do not have seatback screens, and you must use your mobile phone.

AA is always pretty solid. Was on time all the way around today so can’t complain!

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario

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