$180 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 11/18. 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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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

Fri, Sep 12 - Sat, Sep 20
United Airlines Logo
8:37 am - 12:13 pmSJO-ONT
28h 36m1 stop
United Airlines Logo
6:00 am - 7:15 amONT-SJO
24h 15m1 stop
$324United Airlines
Find Deal
Mon, Jul 21 - Thu, Jul 24
American Airlines Logo
11:59 pm - 4:14 pmSJO-ONT
17h 15m2 stops
American Airlines Logo
12:59 am - 10:05 pmONT-SJO
20h 06m1 stop
$338American Airlines
Find Deal
Fri, Sep 12 - Mon, Sep 15
American Airlines Logo
7:27 am - 1:54 pmSJO-ONT
31h 27m1 stop
American Airlines Logo
2:54 pm - 5:57 pmONT-SJO
26h 03m1 stop
$339American Airlines
Find Deal
Sat, Sep 13 - Tue, Sep 23
American Airlines Logo
1:45 pm - 10:05 amSJO-ONT
21h 20m2 stops
American Airlines Logo
6:10 am - 7:42 pmONT-SJO
12h 32m2 stops
$343American Airlines
Find Deal
Wed, Aug 13 - Fri, Aug 22
American Airlines Logo
2:40 pm - 9:59 amSJO-ONT
20h 19m2 stops
American Airlines Logo
2:57 pm - 11:55 amONT-SJO
19h 58m2 stops
$344American Airlines
Find Deal
Sun, Dec 14 - Tue, Dec 30
United Airlines Logo
9:40 am - 5:46 pmSJO-ONT
10h 06m1 stop
United Airlines Logo
6:42 pm - 1:17 pmONT-SJO
16h 35m2 stops
$361United Airlines
Find Deal
Thu, Oct 9 - Sun, Oct 12
United Airlines Logo
8:37 am - 10:42 pmSJO-ONT
15h 05m1 stop
United Airlines Logo
6:36 pm - 7:15 amONT-SJO
11h 39m1 stop
$366United Airlines
Find Deal
Sat, Sep 13 - Tue, Sep 23
American Airlines Logo
7:27 am - 1:19 pmSJO-ONT
30h 52m1 stop
American Airlines Logo
6:10 am - 5:57 pmONT-SJO
10h 47m1 stop
$371American Airlines
Find Deal
Thu, Oct 16 - Thu, Oct 23
Avianca Logo
9:35 am - 9:55 pmSJO-ONT
13h 20m1 stop
Avianca Logo
11:25 pm - 11:15 amONT-SJO
10h 50m1 stop
$426Avianca
Find Deal
Sat, Aug 9 - Sat, Aug 16
Avianca Logo
9:35 am - 9:55 pmSJO-ONT
13h 20m1 stop
Avianca Logo
11:25 pm - 11:15 amONT-SJO
10h 50m1 stop
$453Avianca
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 September, where tickets cost $373 on average for return flights. On the other hand, the most expensive months are February and October, where the average cost of tickets from Costa Rica is $630 and $625 respectively. For one-way flights, the best month to travel is September with an average price of $373.

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 seasonOctober
Cheapest flight$180
Best time to beat the crowds with an average 6% drop in price.
Most popular time to fly with an average 27% 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 648 direct flights from within Costa Rica to Ontario. The most common day for departures is Tuesday, with 17% 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 8846 reviews
7.3Comfort
7.7Boarding
8.1Crew
6.6Food
7.0Entertainment
Airline reviews

Boarded plane and then delayed 1.5 hours while on the plane

4.0 OkayJake, Jul 2025BIH - SFO
Read more United Airlines reviews

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

Horrific. They missed my connecting flight to San Diego. I didn’t get there until Monday at 9am when I had a mandatory court settlement conference scheduled at 6am since we had parties on the east coast. This caused many issues. All because United apparently forgot to hold the doors open until my flight landed that only had a 10 minute delay. This was the last flight to Southern California. So I couldn’t even rent a car to finish the trip. United cannot be trusted when traveling on specific days and times since weather didn’t have anything to do with the delays.

My flight was delayed a very short period of time but they did not hold my connecting flight to San Diego, also through United. So they closed the doors before we got off our plane. They would only have to help the door open for another five to ten minutes. So I missed a court deadline for a manditory mediation settlement conference for my client. I had to get an associate to be there in person and be on the phone with him relaying what he needs to do the entire time. The court was very upset with me and so was my client. United cannot be trusted.

We were given vouchers we couldn’t use with a 5.5 hour delay

Really good 😊 the woman at the gate entrance was a little rude checking in our carry-on but i dont think she worked for the airline, she worked for the airport at sacramento, other than that amazing.

Boarding was mayhem. Late boarding by 15 minutes because of lack of staff (missing 1 flight attendant. We had to wait for an arrival of another plane before we could board). Flight was a little rough, but cannot blame on airlines.

Great experience…left a bit behind schedule but made up fir that in the air and landed 10 minutes early 😁

Airbus plane, nice and polite staff, entertainment even as it was a short flight.

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.

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario

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