$210 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 5/7. 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

Sat, Sep 5 - Sat, Sep 19
Avianca Logo
3:10 pm - 9:45 pm
SJO
-
ONT
7h 35m
1 stop
Avianca Logo
11:35 pm - 8:45 am
ONT
-
SJO
8h 10m
1 stop
$372Avianca
Tue, Apr 21 - Tue, May 5
United Airlines Logo
7:55 am - 9:50 pm
SJO
-
ONT
14h 55m
1 stop
United Airlines Logo
6:59 pm - 7:15 am
ONT
-
SJO
11h 16m
1 stop
$375United Airlines
Tue, May 5 - Thu, May 14
Avianca Logo
3:10 pm - 9:45 pm
SJO
-
ONT
7h 35m
1 stop
Avianca Logo
11:35 pm - 8:45 am
ONT
-
SJO
8h 10m
1 stop
$383Avianca
Thu, Sep 10 - Thu, Sep 24
American Airlines Logo
12:57 pm - 11:06 pm
SJO
-
ONT
11h 09m
1 stop
American Airlines Logo
12:35 pm - 11:05 am
ONT
-
SJO
21h 30m
2 stops
$394American Airlines
Thu, Sep 10 - Thu, Sep 24
American Airlines Logo
12:57 pm - 11:29 am
SJO
-
ONT
23h 32m
2 stops
American Airlines Logo
12:35 pm - 11:05 am
ONT
-
SJO
21h 30m
2 stops
$395American Airlines
Tue, Sep 15 - Mon, Sep 28
United Airlines Logo
1:25 pm - 9:59 pm
SJO
-
ONT
9h 34m
1 stop
United Airlines Logo
6:30 pm - 12:26 pm
ONT
-
SJO
40h 56m
2 stops
$396United Airlines
Mon, May 4 - Sat, May 9
Avianca Logo
7:45 pm - 9:45 pm
SJO
-
ONT
27h 00m
1 stop
Avianca Logo
11:35 pm - 8:45 am
ONT
-
SJO
8h 10m
1 stop
$406Avianca
Mon, Apr 20 - Sat, Apr 25
Avianca Logo
7:45 pm - 9:45 pm
SJO
-
ONT
27h 00m
1 stop
Avianca Logo
11:35 pm - 8:45 am
ONT
-
SJO
8h 10m
1 stop
$410Avianca
Tue, Jun 2 - 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
$582JetBlue
Wed, Jun 10 - Wed, Jun 24
JetBlue Logo
2:00 pm - 10:40 pm
LIR
-
ONT
33h 40m
1 stop
JetBlue Logo
11:59 pm - 12:40 pm
ONT
-
LIR
11h 41m
1 stop
$628JetBlue
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 $372 return. The most popular connection is from Dallas to Ontario and KAYAK users have found round-trip deals for as low as $169 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 $460 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 25 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$210
Best time to beat the crowds with an average 19% drop in price.
Most popular time to fly with an average 15% 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 $372 return. The most popular connection is from Dallas to Ontario and KAYAK users have found round-trip deals for as low as $169 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 786 direct flights from within Costa Rica to Ontario. The most common day for departures is Monday, 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 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 9489 reviews
7.7Boarding
8.1Crew
6.6Food
7.1Entertainment
7.3Comfort
Airline reviews

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.

8.0 ExcellentAnonymous, Mar 2026
MUC - SFO
Read more United Airlines reviews

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.

Flight to Japan was was better across the board than the return to USA. Entertainment: Movie selection was old and not to my liking. Way too many woke choices. Not enough selections for sports or drama. Service: some of the crew were great. Not all. I paid for business class. a premium. Some of the crew thought they 'had' t do there job instead of wanting to serve and be polite. Food: Way to Japan was good. Way back to USA bad. Boarding: Wat out did not offer Business only; had to go thru general. If you pay for business, you should get business perks. Suggest you look for other than United for travel to Asia

I will never fly ANA again. They lost one of my large pieces of checked luggage, the heaviest one with the most valuable items in it, and they said they will not send me an email unless they can't find it, even though the paper they gave me to track the status of my lost luggage requires a code from an email they are supposed to send me so I can do baggage tracing. They claim to be an international airline, but they also insist on calling a Japanese telephone number to confirm where to send the lost baggage if they find it. It is impossible to find an actual contact email address for customer support on their website, and their AI chatbot is unhelpful, directing you to a webpage that says it is for contact information but does not have any actual email addresses or phone numbers listed on it. My seat in economy did not recline at all, even though I was not sitting in an exit row nor the very back row. I had to sit in the fully upright position for over ten hours of international travel. Awful experience overall.

The head flight attendant made the trip excellent. He was very accommodating.

The economy seats on the 777 was not as cramped as I had feared, but the food was terrible.

Terrible experience! delay 2 time and say i dont have ticket

It was amazing. I had several upgraded seats on my flight out. Everything went smooth with no delays.

Flight delayed for more than 16 hrs and no effort was spent to provide an alternate

Flight attendants were friendly & good service, food sucks, seats uncomfortable, not many Asian movies or shows flying from Hong Kong

Flight attendants had a little attitude. Food tastes no good.

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

The check in is the only positive thing in Avianca. The seat is the most uncomfortable I have traveled, the distance is minimal.

Not what it used to be. The sale of food makes them look greedy!

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario