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Costa Rica

$146+ 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 11/16. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJO
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
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 September 16, 2025.

Round-trip from

$304
(Mytrip)

One-way from

$146
(CheapOair)

Popular in

December

Cheapest in

August

Average price

$401
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 ($106 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 September 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 September 16, 2025.

This Mytrip deal was found by Cheapflights users on 9/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1411:25 pmONT - SJO
1 stop10h 50mAvianca
Tue 10/213:05 pmSJO - ONT
1 stop7h 50mAvianca
Deal found 9/14$304
This Priceline deal was found by Cheapflights users on 9/14. 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.
Tue 10/1411:25 pmONT - SJO
1 stop10h 50mAvianca
Thu 10/163:05 pmSJO - ONT
1 stop7h 50mAvianca
Deal found 9/14$310
This American Airlines deal was found by Cheapflights users on 9/14. 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 10/2611:59 pmONT - SJO
2 stops11h 06mAmerican Airlines
Tue 11/42:59 pmSJO - ONT
1 stop9h 30mAmerican Airlines
Deal found 9/14$364
This Priceline deal was found by Cheapflights users on 9/14. 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 9/1811:25 pmONT - SJO
1 stop13h 05mAvianca
Thu 10/233:05 pmSJO - ONT
1 stop7h 50mAvianca
Deal found 9/14$368
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Sat 11/156:38 pmONT - SJO
1 stop11h 54mUnited Airlines
Tue 5/58:45 amSJO - ONT
1 stop10h 15mUnited Airlines
Deal found 9/15$372
This American Airlines deal was found by Cheapflights users on 9/16. 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.
Thu 10/210:35 pmONT - SJO
2 stops20h 07mAmerican Airlines
Mon 10/62:40 pmSJO - ONT
2 stops22h 17mAmerican Airlines
Deal found 9/16$376
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1611:25 pmONT - SJO
1 stop10h 50mAvianca
Tue 9/233:05 pmSJO - ONT
1 stop7h 50mAvianca
Deal found 9/15$388
This Priceline deal was found by Cheapflights users on 9/14. 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.
Tue 11/2510:30 pmONT - SJO
1 stop10h 55mAvianca
Thu 12/43:05 pmSJO - ONT
1 stop7h 50mAvianca
Deal found 9/14$398
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Sat 11/156:38 pmONT - SJO
2 stops14h 47mUnited Airlines
Thu 5/71:30 pmSJO - ONT
1 stop8h 51mUnited Airlines
Deal found 9/15$403
This Cheapflightsfares deal was found by Cheapflights users on 9/14. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/2711:25 pmONT - SJO
1 stop13h 05mAvianca
Sat 10/45:05 amSJO - ONT
1 stop17h 50mAvianca
Deal found 9/14$404
This Trip.com deal was found by Cheapflights users on 9/15. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/156:38 pmONT - SJO
1 stop11h 54mUnited Airlines
Sun 11/239:40 amSJO - ONT
1 stop15h 11mUnited Airlines
Deal found 9/15$407
This Cheapflightsfares deal was found by Cheapflights users on 9/14. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1611:25 pmONT - SJO
1 stop10h 50mAvianca
Tue 9/309:35 amSJO - ONT
1 stop13h 20mAvianca
Deal found 9/14$410

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 September 16, 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

Wed 10/1

1:53 pm-7:15 am

1 stop16h 22m

San José Juan Santamaria Intl

Thu 10/9

8:37 am-10:52 pm

1 stop15h 15m

$372

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sat 11/15

6:38 pm-8:32 am

1 stop11h 54m

San José Juan Santamaria Intl

Tue 5/5

8:45 am-6:00 pm

1 stop10h 15m

$372

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sat 11/15

6:38 pm-8:32 am

1 stop11h 54m

San José Juan Santamaria Intl

Thu 5/7

1:30 pm-9:21 pm

1 stop8h 51m

$403

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 11/17

6:00 am-10:07 pm

2 stops14h 07m

San José Juan Santamaria Intl

Wed 11/26

7:00 am-11:04 pm

1 stop18h 04m

$458

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Thu 10/23

1:53 pm-7:15 am

1 stop16h 22m

San José Juan Santamaria Intl

Sun 10/26

8:40 am-10:51 pm

1 stop15h 11m

$482

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 9/29

6:36 pm-7:15 am

1 stop11h 39m

San José Juan Santamaria Intl

Fri 10/3

8:37 am-10:52 pm

1 stop15h 15m

$482

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sat 11/15

6:38 pm-8:32 am

1 stop11h 54m

San José Juan Santamaria Intl

Tue 11/18

8:45 am-9:49 pm

1 stop15h 04m

$482

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 10/20

6:36 pm-7:15 am

1 stop11h 39m

San José Juan Santamaria Intl

Sat 10/25

8:37 am-5:40 pm

1 stop10h 03m

$482

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Wed 10/29

6:38 pm-7:32 am

1 stop11h 54m

San José Juan Santamaria Intl

Sun 11/2

9:40 am-10:51 pm

1 stop15h 11m

$482

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 1/12

6:00 am-6:16 pm

1 stop10h 16m

San José Juan Santamaria Intl

Wed 1/14

9:40 am-10:53 pm

1 stop15h 13m

$482

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 41 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 $554). 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 September 16, 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 September 16, 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
4,242 reviews

Crew

8.6

Overall

8.0

Comfort

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

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
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Overall

8.0

Comfort

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

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
8,929 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Overall

8.0

Comfort

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

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
4,242 reviews

Crew

8.6

Overall

8.0

Comfort

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

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
2,435 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Overall

8.0

Comfort

8.0

Food

7.0

Entertainment

7.5

Boarding

8.1

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 14h 07m. Fly via United Airlines, Delta, or Alaska Airlines 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 $207. Avianca flights start at $212 while deals on United Airlines start at $300 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 $554). 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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$349Average$632FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$399Average$660FlexibilityNo cancel feeOn-time71%
AviancaCheapest$413Average$492FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$550Average$698FlexibilityNo cancel feeOn-time63%

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