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$177+ 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 12/2. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJO
Dec 19 — Dec 261
Fri 12/19
Fri 12/26
1 adult, Economy
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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 November 19, 2025.

This American Airlines deal was found by Cheapflights users on 11/18. 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.
Fri 11/2810:47 amONT - SJO
1 stop10h 25mAmerican Airlines
Sat 12/66:20 amSJO - ONT
1 stop9h 35mAmerican Airlines
Deal found 11/18$363
This American Airlines deal was found by Cheapflights users on 11/17. 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.
Sat 12/66:00 amONT - SJO
1 stop13h 11mAmerican Airlines
Thu 12/116:20 amSJO - ONT
1 stop19h 35mAmerican Airlines
Deal found 11/17$372
This American Airlines deal was found by Cheapflights users on 11/19. 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.
Sat 12/67:00 amONT - SJO
2 stops13h 28mAmerican Airlines
Tue 12/96:00 amSJO - ONT
2 stops18h 28mAmerican Airlines
Deal found 11/19$376
This United Airlines deal was found by Cheapflights users on 11/19. 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.
Wed 12/36:00 amONT - SJO
1 stop12h 39mUnited Airlines
Mon 12/89:40 amSJO - ONT
1 stop9h 57mUnited Airlines
Deal found 11/19$392
This United Airlines deal was found by Cheapflights users on 11/18. 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.
Thu 11/271:40 pmONT - SJO
1 stop16h 52mUnited Airlines
Sat 12/68:45 amSJO - ONT
1 stop15h 04mUnited Airlines
Deal found 11/18$473
This United Airlines deal was found by Cheapflights users on 11/18. 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.
Wed 11/196:05 amONT - SJO
1 stop12h 34mUnited Airlines
Sat 11/229:40 amSJO - ONT
1 stop9h 54mUnited Airlines
Deal found 11/18$482
This United Airlines deal was found by Cheapflights users on 11/18. 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.
Wed 11/191:33 pmONT - SJO
2 stops21h 42mUnited Airlines
Tue 11/259:40 amSJO - ONT
1 stop9h 54mUnited Airlines
Deal found 11/18$486
This United Airlines deal was found by Cheapflights users on 11/18. 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.
Thu 11/206:05 amONT - SJO
1 stop12h 34mUnited Airlines
Mon 11/249:40 amSJO - ONT
1 stop28h 57mUnited Airlines
Deal found 11/18$488
This United Airlines deal was found by Cheapflights users on 11/19. 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.
Thu 12/41:34 pmONT - SJO
1 stop30h 26mUnited Airlines
Thu 12/112:20 pmSJO - ONT
1 stop9h 29mUnited Airlines
Deal found 11/19$490
This United Airlines deal was found by Cheapflights users on 11/17. 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.
Fri 11/216:05 amONT - SJO
1 stop27h 20mUnited Airlines
Mon 11/249:40 amSJO - ONT
1 stop9h 54mUnited Airlines
Deal found 11/17$493
This United Airlines deal was found by Cheapflights users on 11/17. 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.
Sun 11/236:05 amONT - SJO
1 stop29h 10mUnited Airlines
Thu 11/272:20 pmSJO - ONT
2 stops24h 17mUnited Airlines
Deal found 11/17$498
This United Airlines deal was found by Cheapflights users on 11/18. 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.
Wed 12/176:00 amONT - LIR
1 stop10h 37mUnited Airlines
Thu 12/252:20 pmLIR - ONT
1 stop9h 32mUnited Airlines
Deal found 11/18$657

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 November 19, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$372
(American Airlines)

One-way from

$177
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$474
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.
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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 ($111 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($27 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
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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 November 19, 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

Mon 1/26

6:10 am-6:16 pm

1 stop10h 06m

San José Juan Santamaria Intl

Thu 1/29

9:40 am-5:43 pm

1 stop10h 03m

$372

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Fri 1/16

6:10 am-6:16 pm

1 stop10h 06m

San José Juan Santamaria Intl

Fri 1/23

8:45 am-8:58 pm

2 stops14h 13m

$396

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Thu 2/26

1:45 pm-8:32 am

1 stop16h 47m

San José Juan Santamaria Intl

Fri 3/6

9:40 am-10:57 pm

1 stop15h 17m

$473

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sat 2/28

1:53 pm-8:32 am

1 stop16h 39m

San José Juan Santamaria Intl

Fri 3/6

9:40 am-10:57 pm

1 stop15h 17m

$473

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Thu 2/26

1:45 pm-8:32 am

1 stop16h 47m

San José Juan Santamaria Intl

Wed 3/4

9:40 am-10:57 pm

1 stop15h 17m

$482

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 2/23

6:00 am-8:39 pm

1 stop12h 39m

San José Juan Santamaria Intl

Mon 3/9

7:45 am-10:36 pm

1 stop15h 51m

$482

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Tue 2/3

6:00 am-8:39 pm

1 stop12h 39m

San José Juan Santamaria Intl

Mon 2/9

9:40 am-5:43 pm

1 stop10h 03m

$482

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Thu 4/9

1:33 pm-7:15 am

1 stop16h 42m

San José Juan Santamaria Intl

Thu 4/16

1:25 pm-9:55 am

2 stops21h 30m

$486

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Fri 2/20

6:00 am-8:32 am

1 stop24h 32m

San José Juan Santamaria Intl

Fri 2/27

9:40 am-12:47 pm

1 stop29h 07m

$495

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sun 3/29

5:15 am-7:40 pm

2 stops13h 25m

San José Juan Santamaria Intl

Wed 4/29

1:10 pm-10:25 pm

1 stop10h 15m

$520

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/19

Showing 1-10 of 39 results
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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 $152). Flying from Ontario to Costa Rica in December is currently the most expensive (average of $292). 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 November 19, 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 November 19, 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
9,020 reviews

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Overall

7.4

Crew

8.1

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
9,020 reviews
United Airlines
7.4
Good
9,020 reviews

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Overall

7.4

Crew

8.1

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
11,046 reviews
United Airlines
7.4
Good
9,020 reviews

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Overall

7.4

Crew

8.1

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
2,475 reviews
United Airlines
7.4
Good
9,020 reviews

Comfort

7.3

Entertainment

7.1

Food

6.6

Boarding

7.7

Overall

7.4

Crew

8.1

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 10h 06m. Fly via United Airlines or Delta to get the fastest option. Ontario and Costa Rica are separated by a distance of 2685 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. Avianca flights start at $212 while deals on United Airlines start at $220 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 $152). Flying from Ontario to Costa Rica in December is currently the most expensive (average of $292). 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

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Alternative routes for Ontario to Costa Rica

See prices for flight routes from nearby airports that may be better suited for you.
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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 November 19, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$351Average$619FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$366Average$590FlexibilityNo cancel feeOn-time71%
AviancaCheapest$413Average$492FlexibilityNo cancel feeOn-time71%

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