HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Costa Rica

$158+ Cheap flights from Ontario (ONT) to Costa Rica

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/8. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJO
dic. 6 — dic. 131
sáb. 12/6
sáb. 12/13
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Costa Rica with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Find flight deals from Ontario to Costa Rica

Cheapest flights from Ontario to Costa Rica
Explore the most affordable flight options available from Ontario to Costa Rica. Find the lowest fares from popular airlines and budget airlines, with prices last updated on noviembre 6, 2025.

This United Airlines deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/56:05 amONT - SJO
1 stop12h 34mUnited Airlines
sáb. 11/812:35 pmSJO - ONT
1 stop11h 14mUnited Airlines
Deal found 11/5$372
This United Airlines deal was found by Cheapflights users on 11/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/96:41 pmONT - SJO
1 stop11h 51mUnited Airlines
sáb. 12/138:45 amSJO - ONT
2 stops16h 04mUnited Airlines
Deal found 11/6$376
This United Airlines deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/31:50 pmONT - SJO
1 stop16h 42mUnited Airlines
mié. 12/108:45 amSJO - ONT
1 stop15h 04mUnited Airlines
Deal found 11/5$390
This American Airlines deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/33:04 pmONT - SJO
2 stops20h 35mAmerican Airlines
mié. 12/102:56 pmSJO - ONT
2 stops23h 04mAmerican Airlines
Deal found 11/5$412
This American Airlines deal was found by Cheapflights users on 11/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/93:04 pmONT - SJO
2 stops20h 52mAmerican Airlines
dom. 12/146:20 amSJO - ONT
2 stops17h 40mAmerican Airlines
Deal found 11/6$417
This United Airlines deal was found by Cheapflights users on 11/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/96:41 pmONT - SJO
1 stop11h 51mUnited Airlines
dom. 12/147:30 amSJO - ONT
1 stop15h 12mUnited Airlines
Deal found 11/6$440
This American Airlines deal was found by Cheapflights users on 11/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/62:59 pmONT - SJO
1 stop28h 18mAmerican Airlines
lun. 11/102:59 pmSJO - ONT
1 stop9h 30mAmerican Airlines
Deal found 11/6$447
This American Airlines deal was found by Cheapflights users on 11/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/103:04 pmONT - SJO
2 stops20h 35mAmerican Airlines
dom. 12/146:20 amSJO - ONT
2 stops17h 40mAmerican Airlines
Deal found 11/6$453
This Kissandfly.com deal was found by Cheapflights users on 11/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/295:05 amONT - SJO
1 stop14h 55mLufthansa
sáb. 12/69:40 amSJO - ONT
1 stop9h 57mLufthansa
Deal found 11/6$458
This United Airlines deal was found by Cheapflights users on 11/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/2911:59 pmONT - LIR
1 stop12h 41mUnited Airlines
vie. 1/98:35 amLIR - ONT
1 stop15h 23mUnited Airlines
Deal found 11/6$641
This United Airlines deal was found by Cheapflights users on 11/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 11/295:05 amONT - LIR
1 stop9h 03mUnited Airlines
sáb. 12/62:20 pmLIR - ONT
1 stop9h 29mUnited Airlines
Deal found 11/5$644
This American Airlines deal was found by Cheapflights users on 11/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/2911:59 pmONT - LIR
1 stop12h 28mAmerican Airlines
mar. 1/131:46 pmLIR - ONT
2 stops22h 22mAmerican Airlines
Deal found 11/6$645

Cheap flight deals from Ontario to Costa Rica

Keep the following information in mind while searching for Ontario to Costa Rica flight deals. Data was last updated noviembre 6, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$363
(American Airlines)

One-way from

$158
(Kiwi.com)

Popular in

December

Cheapest in

September

Average price

$482
Provider with most accurate pricing for Los Angeles-San José Juan Santamaria Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-San José Juan Santamaria Intl flights.
Search Deals
From Ontario to Costa Rica
Search Deals
One-way flight from Ontario to Costa Rica
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($112 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($26 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Costa Rica that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated noviembre 6, 2025.
Use the filters below to find and compare flights from Ontario to Costa Rica that are best for you.

Fly from

Ontario

Fly to

Costa Rica

Route

Depart

Return

Price

OntarioSan José

ONT - SJO

ONTSJO

Ontario

mar. 12/9

1:50 pm-8:32 am

1 stop16h 42m

San José Juan Santamaria Intl

sáb. 12/13

2:20 pm-9:49 pm

1 stop9h 29m

$372

OntarioSan José

ONT - SJO

ONTSJO

Ontario

mar. 12/9

6:41 pm-8:32 am

1 stop11h 51m

San José Juan Santamaria Intl

mar. 12/16

2:20 pm-9:49 pm

1 stop9h 29m

$372

OntarioSan José

ONT - SJO

ONTSJO

Ontario

mar. 12/9

6:41 pm-8:32 am

1 stop11h 51m

San José Juan Santamaria Intl

dom. 12/14

7:30 am-8:42 pm

1 stop15h 12m

$440

OntarioSan José

ONT - SJO

ONTSJO

Ontario

mié. 12/10

3:04 pm-1:39 pm

2 stops20h 35m

San José Juan Santamaria Intl

dom. 12/14

6:20 am-10:00 pm

2 stops17h 40m

$453

OntarioSan José

ONT - SJO

ONTSJO

Ontario

jue. 1/15

10:30 pm-11:25 am

1 stop10h 55m

San José Juan Santamaria Intl

dom. 1/25

3:05 pm-8:55 pm

1 stop7h 50m

$465

OntarioSan José

ONT - SJO

ONTSJO

Ontario

vie. 2/6

6:00 am-8:39 pm

1 stop12h 39m

San José Juan Santamaria Intl

vie. 2/13

12:35 pm-9:59 pm

1 stop11h 24m

$482

OntarioSan José

ONT - SJO

ONTSJO

Ontario

lun. 1/12

6:39 pm-8:32 am

1 stop11h 53m

San José Juan Santamaria Intl

mar. 1/20

6:30 am-9:58 pm

1 stop17h 28m

$482

OntarioSan José

ONT - SJO

ONTSJO

Ontario

lun. 2/23

6:00 am-6:16 pm

1 stop10h 16m

San José Juan Santamaria Intl

mié. 3/4

8:45 am-9:59 pm

1 stop15h 14m

$482

OntarioSan José

ONT - SJO

ONTSJO

Ontario

sáb. 1/17

6:00 am-8:39 pm

1 stop12h 39m

San José Juan Santamaria Intl

mar. 1/20

6:30 am-9:58 pm

1 stop17h 28m

$482

OntarioSan José

ONT - SJO

ONTSJO

Ontario

lun. 1/26

6:00 am-6:16 pm

1 stop10h 16m

San José Juan Santamaria Intl

vie. 1/30

9:40 am-5:43 pm

1 stop10h 03m

$482

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/6

Showing 1-10 of 39 results
1
2
3
4

Best time to book a flight from Ontario to Costa Rica

Have a flexible travel schedule? Discover the best time to fly to Costa Rica from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Costa Rica

What is the cheapest month to book a flight from Ontario to Costa Rica?

Currently, October is the cheapest month in which you can book a flight from Ontario to Costa Rica (average of $153). Flying from Ontario to Costa Rica in December is currently the most expensive (average of $305). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ONT to CR?

Find hourly flight availability from Ontario to Costa Rica. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated noviembre 6, 2025.

One of the essential ways to save on airfare from Ontario to Costa Rica is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the afternoon could potentially save you up to 29% on airfare.

Reviews of airlines servicing Costa Rica

Get insights into the airlines that provide service to Costa Rica. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Costa Rica. Reviews last updated noviembre 6, 2025.
See what other customers who have flown with United Airlines, American Airlines, and Avianca from Ontario to Costa Rica have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,004 reviews

Food

6.6

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
9,004 reviews
United Airlines
7.4
Good
9,004 reviews

Food

6.6

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
American Airlines
7.2
Good
11,040 reviews
United Airlines
7.4
Good
9,004 reviews

Food

6.6

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Avianca
6.6
Okay
2,469 reviews
United Airlines
7.4
Good
9,004 reviews

Food

6.6

Comfort

7.3

Crew

8.1

Entertainment

7.1

Overall

7.4

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

Find useful and relevant information for your journey from Ontario to Costa Rica. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ontario to Costa Rica?

    If you book a flight to Costa Rica from Ontario, you will be flying from Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario.

  • How long is the flight from Ontario to Costa Rica?

    There are many flights that can get you from Ontario to Costa Rica in 14h 10m. Fly via United Airlines, American Airlines, or Delta to get the fastest option. Ontario and Costa Rica are separated by a distance of 2590 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Ontario to Costa Rica one-way?

    To fly one-way, consider booking your trip with American Airlines, which is currently one of the cheapest options available, starting at $212. JetBlue flights start at $217 while deals on Delta start at $250 one-way.

  • Can I find deals for flights from Ontario to Costa Rica that include hotel bookings?

    Yes. In addition to deals on Ontario to Costa Rica flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Costa Rica?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Costa Rica.

  • Can I find deals for business class flights from Ontario to Costa Rica?

    Yes. Cheapflights offers flight deals from Ontario to Costa Rica by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Costa Rica?

    Currently, October is the cheapest month in which you can book a flight from Ontario to Costa Rica (average of $153). Flying from Ontario to Costa Rica in December is currently the most expensive (average of $305). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to Costa Rica

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to San Salvador flights
Los Angeles to Guatemala City flights
Los Angeles to San José flights
Ontario to San Salvador flights
Los Angeles to Panama City flights
San Francisco to Panama City flights
Los Angeles to Liberia flights
Ontario to Guatemala City flights
San Francisco to San José flights
Los Angeles to Philip S.W.Goldson flights
San Francisco to Guatemala City flights
Ontario to San José flights
San Francisco to Liberia flights
Los Angeles to Managua flights
San Francisco to San Salvador flights
San Francisco to Philip S.W.Goldson flights
Burbank to San Salvador flights
San Francisco to Managua flights
Oakland to San José flights
Las Vegas to San Salvador flights
Oakland to San Salvador flights
Ontario to Liberia flights
San Diego to San José flights
Ontario to Philip S.W.Goldson flights
San Jose to San José flights
Ontario to Panama City flights
San Francisco to San Pedro Sula flights
Santa Ana to San José flights
San Diego to Panama City flights
Burbank to San José flights
Burbank to Guatemala City flights
San Jose to San Salvador flights
Las Vegas to Panama City flights
Las Vegas to San José flights
Los Angeles to San Pedro Sula flights
Ontario to Managua flights
Sacramento to San José flights
San Jose to Guatemala City flights
Oakland to Guatemala City flights
Sacramento to Philip S.W.Goldson flights
Las Vegas to Guatemala City flights
Santa Ana to Guatemala City flights
San Diego to Liberia flights
Reno to San Salvador flights
San Jose to Liberia flights
San Diego to Philip S.W.Goldson flights
Sacramento to Liberia flights
Santa Ana to San Salvador flights
San Jose to Panama City flights
Reno to San José flights

Top 3 airlines flying from Ontario to Costa Rica

Discover the top 3 airlines that operate flights from Ontario to Costa Rica. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated noviembre 6, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$351Average$619FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$366Average$590FlexibilityNo cancel feeOn-time71%
AviancaCheapest$413Average$492FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.