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$204+ Cheap flights from Greenville to Islip, NY (GSP - ISP)

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 9/7. Fares are subject to change and may not be available on all flights or dates of travel.
GSP — ISP
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
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Cheap flight deals from Greenville to Islip

Discover tips and strategies to find the most affordable flight options for your journey from Greenville (GSP) to Islip (ISP). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 29, 2025.

Round-trip from

$307
(Southwest)

One-way from

$204
(Southwest)

Popular in

May

Cheapest in

April

Average price

$366
From Greenville to Islip Long Island
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One-way flight from Greenville to Islip Long Island
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Highest demand for flights based on searches. 13% potential increase in price ($58 potential increase over avg. RT price).
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Cheapest flight prices on average. 8% potential price decrease ($30 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from Greenville to Islip

Cheapest flights from Greenville to Islip
Explore the most affordable flight options available from Greenville to Islip. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

This Southwest deal was found by Cheapflights users on 7/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/181:50 pmGSP - ISP
1 stop9h 05mSouthwest
Tue 9/236:05 amISP - GSP
1 stop3h 45mSouthwest
Deal found 7/28$307
This KAYAK deal was found by Cheapflights users on 7/28. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/59:46 pmGSP - ISP
2 stops20h 28mBreeze Airways
Sun 12/711:40 amISP - GSP
2 stops9h 04mBreeze Airways
Deal found 7/28$743
This Mytrip deal was found by Cheapflights users on 7/27. 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.
Fri 8/84:05 pmGSP - ISP
3 stops21h 27mMultiple Airlines
Mon 8/1110:36 amISP - GSP
3 stops23h 47mMultiple Airlines
Deal found 7/27$1,145

Cheapflights Fare Finder

 
Customize your flight search to find flights from Greenville to Islip 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 July 29, 2025.
Use the filters below to find and compare flights from Greenville to Islip that are best for you.

Fly from

Greenville

Fly to

Islip

Route

Depart

Return

Price

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Thu 9/18

1:50 pm-10:55 pm

1 stop9h 05m

Islip Long Island

Tue 9/23

6:05 am-9:50 am

1 stop3h 45m

$307

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Fri 10/3

8:46 pm-6:56 pm

3 stops46h 10m

Islip Long Island

Tue 10/7

11:38 am-4:07 pm

2 stops52h 29m

$1,007

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Fri 8/8

4:05 pm-1:32 pm

3 stops21h 27m

Islip Long Island

Mon 8/11

10:36 am-10:23 am

3 stops23h 47m

$1,145

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Sun 9/7

7:15 am-12:30 pm

1 stop5h 15m

$204

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Sun 8/17

4:33 pm-10:04 am

2 stops17h 31m

$365

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Best time to book a flight from Greenville to Islip

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

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

Currently, January is the cheapest month in which you can book a flight from Greenville to Islip, New York (average of $108). Flying from Greenville to Islip, New York in November is currently the most expensive (average of $213). 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 GSP to ISP?

Find hourly flight availability from Greenville to Islip. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 29, 2025.

One of the essential ways to save on airfare from Greenville to Islip, New York is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the morning could potentially save you up to 28% on airfare.

Reviews of airlines servicing Islip

Get insights into the airlines that provide service to Islip. 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 Islip. Reviews last updated July 29, 2025.
Peruse reviews from past customers who have flown with Southwest and Breeze Airways from Greenville to Islip to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,238 reviews
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Breeze Airways
8.0
Very good
190 reviews
Southwest
8.0
Very good
4,238 reviews

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

Related info for your journey

Find useful and relevant information for your journey from Greenville to Islip. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from Greenville to Islip, New York round-trip?

    Southwest, at $307, was found to be the cheapest airline from Greenville to Islip, New York. An alternate airline flying to your destination would be Breeze Airways. Southwest is priced at 21% lower than the current average price of a flight leaving 3 months from now.

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

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

  • How can I find direct flights from Greenville to Islip?

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Greenville to Islip, New York (average of $108). Flying from Greenville to Islip, New York in November is currently the most expensive (average of $213). 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

Traveling to a place near Islip?

Book flights to Islip if you plan to visit one of these locations
Riverhead
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Top airline flying from Greenville to Islip

Discover the top airline that operate flights from Greenville to Islip. 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 July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$282Average$347FlexibilityNo cancel feeOn-time63%

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