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Costa Rica

$160+ 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 10/29. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJO
Aug 25 — Sep 11
Mon 8/25
Mon 9/1
1 adult, Economy
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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 August 20, 2025.

Round-trip from

$356
(American Airlines)

One-way from

$160
(American Airlines)

Popular in

December

Cheapest in

May

Average price

$389
From Ontario to Costa Rica
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One-way flight from Ontario to Costa Rica
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Highest demand for flights based on searches. 18% potential increase in price ($103 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($26 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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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 August 20, 2025.

This United Airlines deal was found by Cheapflights users on 8/19. 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 8/201:42 pmONT - SJO
1 stop16h 33mUnited Airlines
Wed 8/278:37 amSJO - ONT
1 stop10h 00mUnited Airlines
Deal found 8/19$352
This American Airlines deal was found by Cheapflights users on 8/19. 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.
Fri 9/1910:35 pmONT - SJO
2 stops20h 07mAmerican Airlines
Wed 9/246:00 amSJO - ONT
2 stops16h 24mAmerican Airlines
Deal found 8/19$356
This Gotogate deal was found by Cheapflights users on 8/19. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2311:25 pmONT - SJO
1 stop10h 50mAvianca
Tue 10/73:05 pmSJO - ONT
1 stop7h 50mAvianca
Deal found 8/19$362
This American Airlines deal was found by Cheapflights users on 8/17. 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.
Tue 9/2312:47 pmONT - SJO
1 stop28h 10mAmerican Airlines
Tue 9/306:00 amSJO - ONT
2 stops16h 24mAmerican Airlines
Deal found 8/17$364
This American Airlines deal was found by Cheapflights users on 8/19. 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 10/1111:59 pmONT - SJO
1 stop17h 17mAmerican Airlines
Thu 10/166:00 amSJO - ONT
1 stop17h 18mAmerican Airlines
Deal found 8/19$376
This Priceline deal was found by Cheapflights users on 8/19. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/2011:25 pmONT - SJO
1 stop10h 50mAvianca
Sat 10/45:05 amSJO - ONT
1 stop17h 50mAvianca
Deal found 8/19$378
This American Airlines deal was found by Cheapflights users on 8/19. 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.
Sun 8/2411:59 pmONT - SJO
1 stop17h 16mAmerican Airlines
Sat 8/306:00 amSJO - ONT
2 stops17h 48mAmerican Airlines
Deal found 8/19$380
This American Airlines deal was found by Cheapflights users on 8/17. 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 9/2712:45 pmONT - SJO
1 stop28h 29mAmerican Airlines
Wed 10/86:44 amSJO - ONT
1 stop28h 23mAmerican Airlines
Deal found 8/17$393
This Priceline deal was found by Cheapflights users on 8/19. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2811:25 pmONT - SJO
1 stop10h 50mAvianca
Sun 8/313:05 pmSJO - ONT
1 stop7h 50mAvianca
Deal found 8/19$398
This American Airlines deal was found by Cheapflights users on 8/17. 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.
Fri 10/310:35 pmONT - SJO
1 stop13h 10mAmerican Airlines
Mon 10/136:00 amSJO - ONT
1 stop14h 02mAmerican Airlines
Deal found 8/17$401
This American Airlines deal was found by Cheapflights users on 8/18. 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.
Sat 10/1111:59 pmONT - SJO
1 stop17h 17mAmerican Airlines
Sun 10/196:00 amSJO - ONT
1 stop18h 59mAmerican Airlines
Deal found 8/18$406
This Delta deal was found by Cheapflights users on 8/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/510:00 pmONT - LIR
1 stop13h 00mDelta
Thu 10/91:25 pmLIR - ONT
1 stop9h 57mDelta
Deal found 8/18$536

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 August 20, 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

Thu 10/2

10:35 pm-7:42 pm

2 stops20h 07m

San José Juan Santamaria Intl

Tue 10/7

6:44 am-10:42 pm

1 stop16h 58m

$356

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Fri 10/3

2:54 pm-12:45 pm

2 stops20h 51m

San José Juan Santamaria Intl

Mon 10/13

6:00 am-7:02 pm

1 stop14h 02m

$356

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Fri 10/3

2:54 pm-12:45 pm

2 stops20h 51m

San José Juan Santamaria Intl

Sat 10/11

6:44 am-6:52 pm

1 stop13h 08m

$356

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Fri 9/19

10:35 pm-7:42 pm

2 stops20h 07m

San José Juan Santamaria Intl

Wed 9/24

6:00 am-9:24 pm

2 stops16h 24m

$356

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Tue 9/23

10:35 pm-7:42 pm

2 stops20h 07m

San José Juan Santamaria Intl

Tue 9/30

6:00 am-9:24 pm

2 stops16h 24m

$356

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Tue 9/23

11:25 pm-11:15 am

1 stop10h 50m

San José Juan Santamaria Intl

Tue 10/7

3:05 pm-9:55 pm

1 stop7h 50m

$362

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sat 9/13

11:25 pm-11:15 am

1 stop10h 50m

San José Juan Santamaria Intl

Tue 9/23

3:05 pm-9:55 pm

1 stop7h 50m

$368

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sat 10/11

11:59 pm-6:16 pm

1 stop17h 17m

San José Juan Santamaria Intl

Thu 10/16

6:00 am-10:18 pm

1 stop17h 18m

$376

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sat 9/20

11:25 pm-11:15 am

1 stop10h 50m

San José Juan Santamaria Intl

Sat 10/4

5:05 am-9:55 pm

1 stop17h 50m

$378

OntarioLiberia

ONT - LIR

ONTLIR

Ontario

Sun 10/5

10:00 pm-12:00 pm

1 stop13h 00m

Liberia

Thu 10/9

1:25 pm-10:22 pm

1 stop9h 57m

$536

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/18

Showing 1-10 of 33 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, September is the cheapest month in which you can book a flight from Ontario to Costa Rica (average of $398). Flying from Ontario to Costa Rica in March is currently the most expensive (average of $555). 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 August 20, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Costa Rica as you normally would.

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 August 20, 2025.
See what other customers who have flown with Southwest, United Airlines, and American Airlines 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.
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,246 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,928 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Avianca
6.7
Okay
2,411 reviews
Southwest
8.0
Very good
4,246 reviews

Food

7.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

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 13h. Fly via 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 $160. JetBlue flights start at $235 while deals on Delta start at $240 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, September is the cheapest month in which you can book a flight from Ontario to Costa Rica (average of $398). Flying from Ontario to Costa Rica in March is currently the most expensive (average of $555). 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 4 airlines flying from Ontario to Costa Rica

Discover the top 4 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 August 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
AviancaCheapest$317Average$489FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$349Average$633FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$399Average$664FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$550Average$698FlexibilityNo cancel feeOn-time63%

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