$248 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 4/23. 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

Thu, Sep 3 - Wed, Sep 16
United Airlines Logo
8:45 am - 6:11 pm
SJO
-
ONT
10h 26m
1 stop
United Airlines Logo
5:45 am - 7:37 pm
ONT
-
SJO
12h 52m
1 stop
$443United Airlines
Wed, May 6 - Sun, May 17
United Airlines Logo
1:25 pm - 9:41 am
SJO
-
ONT
45h 16m
2 stops
United Airlines Logo
6:00 am - 7:15 am
ONT
-
SJO
24h 15m
1 stop
$449United Airlines
Fri, Jul 24 - Wed, Aug 5
United Airlines Logo
8:45 am - 10:37 pm
SJO
-
ONT
14h 52m
1 stop
United Airlines Logo
1:50 pm - 7:15 am
ONT
-
SJO
16h 25m
1 stop
$458United Airlines
Fri, Sep 18 - Thu, Sep 24
United Airlines Logo
8:45 am - 6:11 pm
SJO
-
ONT
10h 26m
1 stop
United Airlines Logo
1:49 pm - 7:15 am
ONT
-
SJO
16h 26m
1 stop
$465United Airlines
Thu, May 7 - Mon, May 11
United Airlines Logo
8:45 am - 5:52 pm
SJO
-
ONT
10h 07m
1 stop
United Airlines Logo
1:30 pm - 7:37 pm
ONT
-
SJO
29h 07m
2 stops
$469United Airlines
Thu, Jun 25 - Tue, Aug 18
American Airlines Logo
11:59 pm - 6:22 pm
SJO
-
ONT
19h 23m
2 stops
American Airlines Logo
2:27 pm - 11:34 am
ONT
-
SJO
20h 07m
2 stops
$474American Airlines
Thu, Jun 4 - Tue, Jun 9
JetBlue Logo
2:00 pm - 8:47 pm
LIR
-
ONT
31h 47m
1 stop
JetBlue Logo
10:41 pm - 12:40 pm
ONT
-
LIR
12h 59m
1 stop
$566JetBlue
Tue, Jun 9 - Tue, Jun 16
JetBlue Logo
2:00 pm - 8:47 pm
LIR
-
ONT
31h 47m
1 stop
JetBlue Logo
11:53 pm - 12:40 pm
ONT
-
LIR
11h 47m
1 stop
$592JetBlue
Wed, Oct 14 - Sun, Oct 25
Multiple Airlines Logo
1:20 pm - 9:58 pm
LIR
-
ONT
9h 38m
1 stop
Multiple Airlines Logo
5:00 am - 3:08 pm
ONT
-
LIR
9h 08m
1 stop
$623Multiple Airlines
Sun, May 10 - Tue, May 26
Multiple Airlines Logo
1:20 pm - 9:58 pm
LIR
-
ONT
9h 38m
1 stop
Multiple Airlines Logo
6:30 pm - 3:19 pm
ONT
-
LIR
19h 49m
1 stop
$654Multiple Airlines
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 $443 return. The most popular connection is from Seattle to Ontario and KAYAK users have found round-trip deals for as low as $141 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 June and March, where the average cost of tickets from Costa Rica is $493 and $445 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$254
Best time to beat the crowds with an average 20% 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 $443 return. The most popular connection is from Seattle to Ontario and KAYAK users have found round-trip deals for as low as $141 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 656 direct flights from within Costa Rica to Ontario. The most common day for departures is Monday, with 15% 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 9612 reviews
8.1Crew
6.6Food
7.1Entertainment
7.3Comfort
7.7Boarding
Airline reviews

Dinner was good, but the breakfast served in the morning was horrible.

4.0 OkayAnonymous, Apr 2026
NRT - LAX
Read more United Airlines reviews

Dinner was good, but the breakfast served in the morning was horrible.

Packed in plane small uncomfortable seats elbow to elbow nobody wants to be in that situation for the money they paid

Checking in united could not figure out my star alliance gold. Baggage did not get marked priority and didn't receive boarding passes. When got to SFO lounge personal fixed everything Immediately

Meals were poor and service rendered on return flight was mediocre as compared to the flight we took to Germany earlier where the attendants were more attentive, energetic, and mindful of passengers' needs. Thumbs up to crew of UA 58. Thumbs down to UA 59..

Flight left on time, arrived early, pleasant staff provided water, coffee, etc. access to bathrooms was reasonable and were well maintained. blankets were available, lots of entertainment options. LUGGAGE SERVICE WAS GREAT. I got my one checked bag quickly and was able to make a bus connection for a 2 hour bus ride saving me from waiting another 1.5 hours.

Terrible, if possible won't be flying again anytime soon!

Wonderful in-seat entertainment with seatback screens and huge selection of quality movies. The ability to bluetooth connect headphones was amazing.

we did a return flight from Paris CDG to SFO. This trip was much better than the departing flight SFO to CDG. The food was better quality, the crew was nicer, and the interior of the plane seemed cleaner.

Horrible service no Wi-Fi connection on both leg of the flight and they are refusing to fix bad service

We got to get extended leg room in Econ plus that was great. It was nice having our own dietary needs met with our meals, and the connecting flights had it as well. Only negative were the seats my bottom was/is really sore after a ten plus hour flight. Those seats are horrible, understandable for as many people use them. So we are going to purchase a gel seat pad.

Overall, the flight went well and the service was good. However, there was a very frightening moment during landing in Bogotá. Just as the plane was about to touch down, it suddenly went back up into the air. The aircraft was not descending straight and seemed to move left and right, which made the situation feel unstable. This was quite scary. After going back up, the plane circled for about 15 minutes before attempting to land again. Although I understand that safety always comes first and situations like this can happen, it was still a shocking experience for passengers.

The worst experience I've ever had because the "people" @ Avianca wouldn't let me fly because they said I needed a round trip ticket

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.

I actually upgraded to the medium level of seats from basic and even doing that it may have been physically the most uncomfortable flight I have ever had. They packed everyone like is a train to death camp. It was a red eye so I hoped to get some sleep but it was physically impossible to find a comfortable way to rest. I met other folks on the same flight and they said the same thing. It was an utterly miserable flight and if I have any other options I will never fly with them again

Here we have another airline flying to Guatemala but doesn't have a plus or a less, just in the middle. Why? Well, first we don't have even free water Movie selection is poor Seats don't recline in some places Food selection is carb based Forgot to mention, customer service on the web is the worst. Good things; Very reliable on schedule Kind crew

Last seat of Bussines Class it does recline but passenger seating behind kept pushing since they did not have space once my seat was reclined

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

I couldnt recline the seat. Other than that crew was very attentive and helpful. Thsnk you

6 hour flight and have to pay for everything 100 dollars to add a carry-on bag is insane

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario