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$157+ Cheap flights from Greenville to Islip (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 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
GSP — ISP
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
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 September 16, 2025.

Round-trip from

$269
(Kiwi.com)

One-way from

$157
(Kiwi.com)

Popular in

May

Cheapest in

April

Average price

$406
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. 11% potential increase in price ($51 potential increase over avg. RT price).
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Cheapest flight prices on average. 7% potential price decrease ($29 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 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 September 16, 2025.

This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/68:03 pmGSP - ISP
1 stop22h 25mBreeze Airways
Sun 11/911:40 amISP - GSP
2 stops9h 34mBreeze Airways
Deal found 9/14$269
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/78:03 pmGSP - ISP
1 stop14h 34mMultiple Airlines
Sun 11/99:27 pmISP - GSP
1 stop21h 56mMultiple Airlines
Deal found 9/14$281
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/156:05 amGSP - ISP
1 stop6h 20mSouthwest
Wed 10/2211:40 amISP - GSP
1 stop8h 15mSouthwest
Deal found 9/15$282
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/68:00 pmGSP - ISP
1 stop3h 50mSouthwest
Sun 11/95:30 pmISP - GSP
1 stop4h 05mSouthwest
Deal found 9/14$332
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/38:03 pmGSP - ISP
1 stop14h 52mMultiple Airlines
Sat 10/48:45 pmISP - GSP
1 stop13h 08mMultiple Airlines
Deal found 9/15$337
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/227:26 pmGSP - ISP
1 stop15h 14mMultiple Airlines
Wed 9/2411:35 amISP - GSP
1 stop22h 53mMultiple Airlines
Deal found 9/16$406
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/78:00 amGSP - ISP
2 stops14h 35mSouthwest
Sun 11/95:50 amISP - GSP
2 stops13h 35mSouthwest
Deal found 9/14$428

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 September 16, 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 11/6

8:03 pm-6:28 pm

1 stop22h 25m

Islip Long Island

Sun 11/9

11:40 am-9:14 pm

2 stops9h 34m

$269

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Fri 11/7

8:03 pm-10:37 am

1 stop14h 34m

Islip Long Island

Sun 11/9

9:27 pm-7:23 pm

1 stop21h 56m

$281

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Wed 10/15

6:05 am-12:25 pm

1 stop6h 20m

Islip Long Island

Wed 10/22

11:40 am-7:55 pm

1 stop8h 15m

$282

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Thu 11/6

8:00 pm-11:50 pm

1 stop3h 50m

Islip Long Island

Sun 11/9

5:30 pm-9:35 pm

1 stop4h 05m

$332

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Fri 10/3

8:03 pm-10:55 am

1 stop14h 52m

Islip Long Island

Sat 10/4

8:45 pm-9:53 am

1 stop13h 08m

$337

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Fri 11/7

8:00 am-10:35 pm

2 stops14h 35m

Islip Long Island

Sun 11/9

5:50 am-7:25 pm

2 stops13h 35m

$428

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Fri 10/3

8:03 pm-10:55 am

1 stop14h 52m

$157

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Fri 10/24

8:46 pm-8:05 pm

2 stops23h 19m

$512

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Fri 10/3

8:46 pm-6:56 pm

3 stops46h 10m

$521

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

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?

Currently, January is the cheapest month in which you can book a flight from Greenville to Islip (average of $108). Flying from Greenville to Islip 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 September 16, 2025.

One of the essential ways to save on airfare from Greenville to Islip 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 September 16, 2025.
Peruse reviews from past customers who have flown with Southwest 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
4,242 reviews

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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.

  • How long is the flight from Greenville to Islip?

    There are many flights that can get you from Greenville to Islip in 6h 20m. Fly via Breeze Airways or Southwest to get the fastest option. Greenville and Islip are separated by a distance of 642 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What is the cheapest airline to fly from Greenville to Islip round-trip?

    According to our current data, Southwest ($282), offers the cheapest pricing from Greenville to Islip. Southwest is currently priced 28% below the average price you’ll pay for this route.

  • 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?

    Currently, January is the cheapest month in which you can book a flight from Greenville to Islip (average of $108). Flying from Greenville to Islip 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
Southampton

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Alternative routes for Greenville to Islip

See prices for flight routes from nearby airports that may be better suited for you.
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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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$282Average$347FlexibilityNo cancel feeOn-time63%

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