$153 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 11/20. 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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Everything you should know

Cheapest round-trip
$267
Overall average: $459
United Airlines
ter 12/16qui 2/5
SJO - ONT • 2 stops
Cheapest one-way
$147
Typical prices: $161-$162
Avianca
qui 11/20
SJO - ONT • 1 stop
When to travel
October
Cheapest • 18% price drop
November
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Ontario!
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

ter, dez 16 - qui, fev 5
United Airlines Logo
8:45 am - 10:49 pmSJO-ONT
16h 04m2 stops
United Airlines Logo
1:53 pm - 6:16 pmONT-SJO
26h 23m2 stops
$267United Airlines
Find Deal
sex, dez 12 - qua, abr 22
American Airlines Logo
2:56 pm - 1:55 pmSJO-ONT
24h 59m1 stop
American Airlines Logo
6:43 am - 9:55 pmONT-SJO
14h 12m1 stop
$282American Airlines
Find Deal
sex, dez 12 - qua, abr 22
American Airlines Logo
3:38 pm - 8:53 amSJO-ONT
19h 15m2 stops
American Airlines Logo
6:43 am - 9:55 pmONT-SJO
14h 12m1 stop
$286American Airlines
Find Deal
sex, mai 1 - seg, mai 4
United Airlines Logo
8:45 am - 12:20 pmSJO-ONT
28h 35m1 stop
United Airlines Logo
4:15 pm - 12:26 pmONT-SJO
19h 11m2 stops
$305United Airlines
Find Deal
seg, dez 15 - seg, fev 2
United Airlines Logo
9:40 am - 10:49 pmSJO-ONT
15h 09m1 stop
United Airlines Logo
5:05 am - 8:39 pmONT-SJO
37h 34m2 stops
$321United Airlines
Find Deal
qui, fev 19 - ter, fev 24
Avianca Logo
9:35 am - 8:55 pmSJO-ONT
13h 20m1 stop
Avianca Logo
10:30 pm - 11:25 amONT-SJO
10h 55m1 stop
$324Avianca
Find Deal
sex, dez 12 - qua, abr 22
American Airlines Logo
2:56 pm - 9:54 amSJO-ONT
20h 58m1 stop
American Airlines Logo
6:43 am - 9:55 pmONT-SJO
14h 12m1 stop
$329American Airlines
Find Deal
ter, abr 21 - qua, abr 29
American Airlines Logo
2:35 pm - 9:27 amSJO-ONT
19h 52m2 stops
American Airlines Logo
10:32 am - 9:55 pmONT-SJO
10h 23m2 stops
$333American Airlines
Find Deal
sex, dez 12 - qua, abr 22
American Airlines Logo
3:38 pm - 8:53 amSJO-ONT
19h 15m2 stops
American Airlines Logo
8:05 pm - 1:10 pmONT-SJO
16h 05m2 stops
$341American Airlines
Find Deal
sáb, abr 25 - ter, abr 28
American Airlines Logo
2:35 pm - 11:20 amSJO-ONT
21h 45m2 stops
American Airlines Logo
6:00 am - 11:10 amONT-SJO
28h 10m2 stops
$344American Airlines
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 October, where tickets cost $368 on average for one-way flights. On the other hand, the most expensive months are February and January, where the average cost of tickets from Costa Rica is $547 and $523 respectively. For return trips, the best month to travel is October with an average price of $368.

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 0 weeks before departure. For the absolute cheapest price, our data suggests you should book 3 days before departure.

Good to know

Low seasonMarch
Cheapest flight$147
Best time to beat the crowds with an average 5% drop in price.
Most popular time to fly with an average 5% 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 tickets can be as cheap as $418. On the other hand, the most expensive day to fly is Wednesday, where 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 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 756 direct flights from within Costa Rica to Ontario. The most common day for departures is Monday, 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 9015 reviews
7.3Comfort
7.1Entertainment
7.7Boarding
6.6Food
8.1Crew
Airline reviews

United needs to step up their game. Delayed flight leaving Seattle, San Francisco. Older aircraft, not very comfortable.

4.0 OkayThomas, Nov 2025SEA - SFO
Read more United Airlines reviews

United needs to step up their game. Delayed flight leaving Seattle, San Francisco. Older aircraft, not very comfortable.

The flight attendants were very rude, beyond comprehension. I took a business class from London to SFO for the first time on United. When I asked for a second piece of bread during dinner, the serving attendant threw a 3rd bread on my plate and said, “here. You can have this one too”! I couldn’t believe the rudeness of the attendant. Most all attendants were very rude, unhelpful, sing the food was absolutely disgusting. Never fly United internationally in business class. My flight back to SFO was a nightmare!!

Plane boarded early a quickly, was mostly full. We left close to on time. And landed early.

7 hours delayed due to operational issues on United’s end. Basically laziness.

Flight from Rome to SFO was excellent compared To our flight to Europe from SFO. The food was much tastier. You can see how UNITED is skimping, though. Instead of getting something mid flight you had to ask for it. It was not automatically served. There was a cookie at the end of the arrival meal, for example that tasted like it just came out of a box. They used to serve a little container of nuts, now … a tiny container of nuts, mixed with pretzels. This was business class that you really have to pay for! But this is minor complaints compared to the overall. My major complaint is the position of the even numbered seats by the windows. You have to turn around to see your window & the positioning as some other controls are harder to get at. This is compared to the odd number seat that are perfectly aligned.

The food quality sucks. One must starve if they do not eat flesh Or wheat based products Some variety would be expected. The trivial amount of snacks and or food is inhumane

Flight was timely, relatively comfortable, with decent entertainment and food served. Only problem encountered was with the free messaging which I highly appreciate, but it did not work from iphone to non-iphones.

The internet service I paid for didn’t work at all and the flight crew was not very friendly.

Subject: Formal Complaint: Discriminatory and Unprofessional Conduct – Request for Immediate Action & Compensation Dear [Airline Customer Relations Team], I am writing to file a formal complaint regarding my recent travel experience with [Airline], which was by far the worst I have ever encountered. What occurred was not only unprofessional, but in several instances discriminatory, unsafe, and unacceptable. On the first leg of my trip, I arrived only four minutes past check-in. Instead of making any attempt to resolve the matter, your representative flatly denied me boarding and made me wait while she attended to passengers who arrived after me. By the time a manager intervened, it was too late to board, costing me time, money, and unnecessary frustration. The second leg of my trip (Chicago–San Francisco) raised even more serious concerns. From the outset, it was apparent that the staff—particularly two attendants—prioritized Caucasian passengers while dismissing African American and minority passengers. • When a Caucasian passenger in the exit row refused to comply with federal safety requirements, I, as a first responder, immediately offered to switch seats and assume the responsibility. My offer was blatantly ignored, and instead, a Caucasian passenger seated further up was chosen. This was discriminatory and deeply insulting, especially as I was actively de-escalating the situation that could have delayed the flight further. • During a lengthy tarmac delay of over 90 minutes, passengers were given conflicting and unreasonable instructions that created unnecessary distress and tension. • Throughout the flight, a visibly intoxicated passenger directly in front of me was disruptive, rude to others, failed to comply with seatbelt and electronic device rules, and yet faced no enforcement from the crew. In stark contrast, I was singled out for repeated compliance checks even though I was following every rule. This unequal treatment was so obvious that multiple passengers around me spoke up in my defense. This pattern of behavior demonstrated a clear lack of professionalism, disregard for passenger safety, and discriminatory treatment. I expect far better from an airline of your stature. As a paying customer subjected to this unacceptable treatment, I am formally requesting: 1. A full investigation into the conduct of the staff on both flights. 2. A written apology acknowledging the discriminatory and unprofessional behavior I endured. 3. Appropriate compensation for the distress, inconvenience, and mishandling of my travel. If this matter is not addressed promptly and thoroughly, I will have no choice but to escalate my complaint further, including filing with the U.S. Department of Transportation and sharing my experience through other channels. I trust [Airline] will take this complaint seriously and provide a timely resolution.

Check in was quick and easy during early hours. Flight was on time, and customer services was a plus.

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario