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Costa Rica

$192+ 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 8/25. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SJO
Jul 3 — Jul 101
Fri 7/3
Fri 7/10
1 adult, Economy
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Cheap 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 June 3, 2026.

This Southwest deal was found by Cheapflights users on 6/1. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/16:10 pm
ONT
-
SJO
1 stop10h 50m
Southwest
Thu 10/812:55 pm
SJO
-
ONT
1 stop11h 20m
Southwest
Deal found 6/1$484
This Avianca deal was found by Cheapflights users on 5/30. 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 Avianca is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/611:35 pm
ONT
-
SJO
1 stop8h 10m
Avianca
Thu 6/113:10 pm
SJO
-
ONT
1 stop7h 35m
Avianca
Deal found 5/30$509
This Southwest deal was found by Cheapflights users on 5/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/114:45 pm
ONT
-
SJO
2 stops19h 00m
Southwest
Tue 8/259:00 am
SJO
-
ONT
2 stops12h 55m
Southwest
Deal found 5/29$514
This Avianca deal was found by Cheapflights users on 5/29. 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 Avianca is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/1611:35 pm
ONT
-
SJO
1 stop8h 10m
Avianca
Tue 6/233:10 pm
SJO
-
ONT
1 stop7h 35m
Avianca
Deal found 5/29$519
This Avianca deal was found by Cheapflights users on 5/29. 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 Avianca is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/611:35 pm
ONT
-
SJO
1 stop8h 10m
Avianca
Sat 6/133:10 pm
SJO
-
ONT
1 stop7h 35m
Avianca
Deal found 5/29$524
This Avianca deal was found by Cheapflights users on 5/30. 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 Avianca is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/411:35 pm
ONT
-
SJO
1 stop8h 10m
Avianca
Thu 6/113:10 pm
SJO
-
ONT
1 stop7h 35m
Avianca
Deal found 5/30$529
This Avianca deal was found by Cheapflights users on 6/1. 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 Avianca is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/1311:35 pm
ONT
-
SJO
1 stop8h 10m
Avianca
Sat 6/203:10 pm
SJO
-
ONT
1 stop7h 35m
Avianca
Deal found 6/1$539
This Gotogate deal was found by Cheapflights users on 5/28. 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.
Sat 9/1911:35 pm
ONT
-
SJO
1 stop10h 55m
Avianca
Sat 9/263:10 pm
SJO
-
ONT
1 stop7h 35m
Avianca
Deal found 5/28$541
This Gotogate deal was found by Cheapflights users on 6/1. 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.
Sat 6/2711:35 pm
ONT
-
SJO
1 stop10h 55m
Avianca
Tue 6/309:40 am
SJO
-
ONT
1 stop13h 05m
Avianca
Deal found 6/1$544
This Gotogate deal was found by Cheapflights users on 6/2. 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.
Thu 6/1111:35 pm
ONT
-
SJO
1 stop10h 55m
Avianca
Tue 6/163:10 pm
SJO
-
ONT
1 stop7h 35m
Avianca
Deal found 6/2$546
This Super.com deal was found by Cheapflights users on 6/1. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/911:35 pm
ONT
-
SJO
1 stop10h 55m
Avianca
Sat 6/209:40 am
SJO
-
ONT
1 stop13h 05m
Avianca
Deal found 6/1$547
This American Airlines deal was found by Cheapflights users on 5/29. 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.
Mon 7/137:15 pm
ONT
-
LIR
2 stops17h 00m
American Airlines
Mon 7/203:40 pm
LIR
-
ONT
1 stop9h 19m
American Airlines
Deal found 5/29$623

Find 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 June 3, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$484
(Southwest)

One-way from

$192
(SmartFares)

Popular in

December

Cheapest in

October

Average price

$557
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. 11% potential increase in price ($61 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
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 June 3, 2026.
Use the filters below to find and compare flights from Ontario to Costa Rica that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Thu 6/18

5:45 am-10:39 pm

1 stop15h 54m

San José Juan Santamaria Intl

Mon 6/22

11:13 am-9:55 pm

1 stop11h 42m

$675

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Fri 7/3

5:45 am-10:39 pm

1 stop15h 54m

San José Juan Santamaria Intl

Tue 7/21

8:45 am-10:37 pm

1 stop14h 52m

$684

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sat 8/8

4:20 pm-7:15 am

1 stop13h 55m

San José Juan Santamaria Intl

Thu 8/27

8:45 am-8:01 pm

1 stop12h 16m

$684

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Mon 6/29

1:50 pm-7:15 am

1 stop16h 25m

San José Juan Santamaria Intl

Thu 7/2

8:45 am-10:37 pm

1 stop14h 52m

$684

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sun 6/21

5:45 am-7:37 pm

1 stop12h 52m

San José Juan Santamaria Intl

Tue 7/21

7:55 am-9:55 pm

1 stop15h 00m

$684

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Fri 7/3

1:50 pm-7:15 am

1 stop16h 25m

San José Juan Santamaria Intl

Fri 7/17

1:25 pm-12:47 pm

2 stops24h 22m

$689

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Fri 9/11

5:00 am-7:37 pm

2 stops13h 37m

San José Juan Santamaria Intl

Sun 9/20

7:55 am-9:59 pm

1 stop15h 04m

$689

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sat 8/8

1:18 pm-10:11 am

2 stops19h 53m

San José Juan Santamaria Intl

Sat 8/22

8:45 am-6:16 pm

1 stop10h 31m

$689

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Sun 8/16

7:13 pm-7:15 am

1 stop11h 02m

San José Juan Santamaria Intl

Wed 8/26

1:25 pm-12:12 pm

2 stops23h 47m

$689

OntarioSan José

ONT - SJO

ONTSJO

Ontario

Fri 6/12

5:00 am-10:39 pm

2 stops16h 39m

San José Juan Santamaria Intl

Sun 6/14

6:40 am-8:46 pm

1 stop15h 06m

$689

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/30

Showing 1-10 of 45 resultsSorted by cheapest first
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5

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, February is the cheapest month in which you can book a flight from Ontario to Costa Rica (average of $119). Flying from Ontario to Costa Rica in July is currently the most expensive (average of $451). 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.

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 June 3, 2026.
See what other customers who have flown with United Airlines,American Airlines, andAvianca 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
9,777 reviews

Comfort

7.3

Crew

8.1

Entertainment

7.1

Boarding

7.7

Food

6.6

Overall

7.4

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
United Airlines
7.4
Good
9,777 reviews
United Airlines
7.4
Good
9,777 reviews

Comfort

7.3

Crew

8.1

Entertainment

7.1

Boarding

7.7

Food

6.6

Overall

7.4

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
American Airlines
7.1
Good
11,641 reviews
United Airlines
7.4
Good
9,777 reviews

Comfort

7.3

Crew

8.1

Entertainment

7.1

Boarding

7.7

Food

6.6

Overall

7.4

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.
Avianca
6.5
Okay
2,527 reviews
United Airlines
7.4
Good
9,777 reviews

Comfort

7.3

Crew

8.1

Entertainment

7.1

Boarding

7.7

Food

6.6

Overall

7.4

Reviews

1 / 20
4.0
Okay

Dynasty,May 2026

LAX - EWR

The food wasn’t nice - Hosts were not that kind.

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 15h 54m. Fly via United Airlines to get the fastest option. Ontario and Costa Rica are separated by a distance of 2685 mi.

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

    To fly one-way, consider booking your trip with Avianca, which is currently one of the cheapest options available, starting at $155. American Airlines flights start at $159 while deals on United Airlines start at $169 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, February is the cheapest month in which you can book a flight from Ontario to Costa Rica (average of $119). Flying from Ontario to Costa Rica in July is currently the most expensive (average of $451). 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

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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 June 3, 2026.
AirlineCheapestAverageFlexibilityOn-time
AviancaCheapest$215Average$499FlexibilityNo cancel feeOn-time71%
American AirlinesCheapest$356Average$531FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$371Average$481FlexibilityNo cancel feeOn-time69%

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