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$301+ Cheap flights from Islip, NY (ISP) 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 12/17. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SJO
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
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Cheap flight deals from Islip to Costa Rica

Keep the following information in mind while searching for Islip to Costa Rica flight deals. Data was last updated August 14, 2025.

Round-trip from

$343
(Expedia)

One-way from

$301
(Expedia)

Popular in

December

Cheapest in

October

Average price

$466
From Islip Long Island to Costa Rica
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One-way flight from Islip Long Island to Costa Rica
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Highest demand for flights based on searches. 11% potential increase in price ($59 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($24 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 Islip to Costa Rica

Cheapest flights from Islip to Costa Rica
Explore the most affordable flight options available from Islip to Costa Rica. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

This Expedia deal was found by Cheapflights users on 8/14. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/114:19 pmISP - SJO
1 stop21h 23mJetBlue
Thu 9/181:00 pmSJO - ISP
1 stop19h 50mJetBlue
Deal found 8/14$343
This Kiwi.com deal was found by Cheapflights users on 8/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1711:35 amISP - SJO
1 stop24h 52mMultiple Airlines
Mon 9/2211:37 amSJO - ISP
1 stop21h 03mMultiple Airlines
Deal found 8/12$372
This Kiwi.com deal was found by Cheapflights users on 8/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1111:25 amISP - SJO
2 stops25h 49mMultiple Airlines
Thu 9/1811:37 amSJO - ISP
1 stop21h 03mMultiple Airlines
Deal found 8/14$429
This Southwest deal was found by Cheapflights users on 8/14. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/116:25 amISP - SJO
2 stops14h 30mSouthwest
Thu 9/188:50 amSJO - ISP
2 stops12h 05mSouthwest
Deal found 8/14$572

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip 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 14, 2025.
Use the filters below to find and compare flights from Islip to Costa Rica that are best for you.

Fly from

Islip

Fly to

Costa Rica

Route

Depart

Return

Price

IslipSan José

ISP - SJO

ISPSJO

Islip Long Island

Thu 9/11

4:19 pm-11:42 am

1 stop21h 23m

San José Juan Santamaria Intl

Thu 9/18

1:00 pm-10:50 am

1 stop19h 50m

$343

IslipSan José

ISP - SJO

ISPSJO

Islip Long Island

Wed 9/17

11:35 am-10:27 am

1 stop24h 52m

San José Juan Santamaria Intl

Mon 9/22

11:37 am-10:40 am

1 stop21h 03m

$372

IslipSan José

ISP - SJO

ISPSJO

Islip Long Island

Thu 9/11

11:25 am-11:14 am

2 stops25h 49m

San José Juan Santamaria Intl

Thu 9/18

11:37 am-10:40 am

1 stop21h 03m

$429

IslipSan José

ISP - SJO

ISPSJO

Islip Long Island

Thu 9/11

6:25 am-6:55 pm

2 stops14h 30m

San José Juan Santamaria Intl

Thu 9/18

8:50 am-10:55 pm

2 stops12h 05m

$572

IslipSan José

ISP - SJO

ISPSJO

Islip Long Island

Wed 12/17

10:45 am-8:39 am

1 stop22h 54m

$301

IslipSan José

ISP - SJO

ISPSJO

Islip Long Island

Tue 12/16

6:15 am-8:30 pm

2 stops15h 15m

$312

IslipSan José

ISP - SJO

ISPSJO

Islip Long Island

Wed 12/17

8:09 pm-7:33 am

2 stops36h 24m

$424

IslipSan José

ISP - SJO

ISPSJO

Islip Long Island

Mon 12/22

10:16 am-7:33 am

2 stops22h 17m

$486

IslipSan José

ISP - SJO

ISPSJO

Islip Long Island

Sun 12/21

9:09 pm-7:33 am

2 stops35h 24m

$543

IslipSan José

ISP - SJO

ISPSJO

Islip Long Island

Mon 12/22

6:55 am-1:15 pm

1 stop7h 20m

$552

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/14

Showing 1-10 of 11 results
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Best time to book a flight from Islip to Costa Rica

Have a flexible travel schedule? Discover the best time to fly to Costa Rica from Islip 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 Islip to Costa Rica

What is the cheapest month to book a flight from Islip, New York to Costa Rica?

Currently, September is the cheapest month in which you can book a flight from Islip, New York to Costa Rica (average of $398). Flying from Islip, New York 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.

Related info for your journey

Find useful and relevant information for your journey from Islip 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 Islip to Costa Rica?

    Most people fly from Islip Long Island (ISP) if they book a flight from Islip to Costa Rica. Islip Long Island is conveniently located just 7.2 mi from Islip’s city center.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Islip 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 Islip, New York to Costa Rica?

    Currently, September is the cheapest month in which you can book a flight from Islip, New York to Costa Rica (average of $398). Flying from Islip, New York 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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