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$170+ 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 4/15. Fares are subject to change and may not be available on all flights or dates of travel.
GSP — ISP
Apr 16 — Apr 231
Thu 4/16
Thu 4/23
1 adult, Economy
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Cheap 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 March 17, 2026.

This Southwest deal was found by Cheapflights users on 3/14. 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.
Sat 4/1812:25 pm
GSP
-
ISP
1 stop3h 35m
Southwest
Sun 4/1911:50 am
ISP
-
GSP
1 stop10h 20m
Southwest
Deal found 3/14$368
This Kiwi.com deal was found by Cheapflights users on 3/14. 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 6/58:28 pm
GSP
-
ISP
1 stop13h 37m
Multiple Airlines
Sun 6/76:46 pm
ISP
-
GSP
2 stops14h 32m
Multiple Airlines
Deal found 3/14$377
This Southwest deal was found by Cheapflights users on 3/15. 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.
Thu 5/211:50 pm
GSP
-
ISP
1 stop6h 35m
Southwest
Sun 5/246:05 am
ISP
-
GSP
1 stop4h 05m
Southwest
Deal found 3/15$387
This Southwest deal was found by Cheapflights users on 3/14. 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 6/51:55 pm
GSP
-
ISP
1 stop3h 20m
Southwest
Sun 6/72:55 pm
ISP
-
GSP
1 stop6h 45m
Southwest
Deal found 3/14$402
This Southwest deal was found by Cheapflights users on 3/15. 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.
Sat 6/138:15 am
GSP
-
ISP
2 stops14h 40m
Southwest
Mon 6/153:05 pm
ISP
-
GSP
2 stops7h 40m
Southwest
Deal found 3/15$403
This Southwest deal was found by Cheapflights users on 3/15. 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.
Mon 4/201:50 pm
GSP
-
ISP
1 stop6h 35m
Southwest
Fri 4/244:30 pm
ISP
-
GSP
1 stop4h 25m
Southwest
Deal found 3/15$407
This Southwest deal was found by Cheapflights users on 3/13. 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 4/101:50 pm
GSP
-
ISP
1 stop6h 35m
Southwest
Fri 4/174:30 pm
ISP
-
GSP
1 stop4h 25m
Southwest
Deal found 3/13$419

Find 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 March 17, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$368
(Southwest)

One-way from

$170
(Southwest)

Popular in

February

Cheapest in

April

Average price

$569
Provider with most accurate pricing for Greenville-Islip Long Island flight deals.
Search Deals
Provider most trusted by Cheapflights users for Greenville-Islip Long Island flights.
Search Deals
From Greenville to Islip Long Island
Search Deals
One-way flight from Greenville to Islip Long Island
Search Deals
Highest demand for flights based on searches. 34% potential increase in price ($226 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease ($36 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

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 March 17, 2026.
Use the filters below to find and compare flights from Greenville to Islip that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Sat 4/18

12:25 pm-4:00 pm

1 stop3h 35m

Islip Long Island

Sun 4/19

11:50 am-10:10 pm

1 stop10h 20m

$368
Quickest round-trip

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Sat 6/13

8:15 am-11:35 am

1 stop3h 20m

Islip Long Island

Mon 6/15

5:50 pm-9:35 pm

1 stop3h 45m

$387

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Thu 5/21

1:50 pm-8:25 pm

1 stop6h 35m

Islip Long Island

Sun 5/24

6:05 am-10:10 am

1 stop4h 05m

$387

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Fri 6/5

1:55 pm-5:15 pm

1 stop3h 20m

Islip Long Island

Sun 6/7

2:55 pm-9:40 pm

1 stop6h 45m

$402

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Fri 4/10

1:50 pm-8:25 pm

1 stop6h 35m

Islip Long Island

Fri 4/17

4:30 pm-8:55 pm

1 stop4h 25m

$419

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Mon 7/6

1:55 pm-5:15 pm

1 stop3h 20m

Islip Long Island

Mon 7/13

6:00 am-1:15 pm

1 stop7h 15m

$438

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Tue 3/31

8:00 am-11:40 am

1 stop3h 40m

Islip Long Island

Sat 4/4

5:50 pm-9:45 pm

1 stop3h 55m

$467
Cheapest one-way
Quickest one-way

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Wed 4/15

8:20 am-1:50 pm

1 stop5h 30m

$170

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Thu 4/23

2:12 pm-1:31 pm

2 stops23h 19m

$440

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Sun 4/26

4:55 pm-6:40 pm

1 stop25h 45m

$499

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/14

Showing 1-10 of 13 resultsSorted by cheapest first
1
2

Compare providers for flights from Greenville to Islip

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Greenville to Islip in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Greenville-Islip, New York flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Greenville-Islip, New York flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Greenville-Islip, New York flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Greenville-Islip, New York flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Greenville-Islip, New York flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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, July is the cheapest month in which you can book a flight from Greenville to Islip, New York (average of $41). Flying from Greenville to Islip, New York in December is currently the most expensive (average of $78). 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 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 March 17, 2026.
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
4,320 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

KOA - HNL

pretty smooth and fast service ever, that flight is very helpful each and everyone for price and also fright for free..
Southwest
8.0
Very good
4,320 reviews
Southwest
8.0
Very good
4,320 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Overall

8.0

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

KOA - HNL

pretty smooth and fast service ever, that flight is very helpful each and everyone for price and also fright for free..

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, New York?

    Southwest can get you from Greenville to Islip, New York in just under 3h 35m. Your travel time can differ by up to . Airlines will cover a distance of 642 mi.

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

    Southwest, at $286, was found to be the cheapest airline from Greenville to Islip, New York.. Southwest is priced at 34% 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, July is the cheapest month in which you can book a flight from Greenville to Islip, New York (average of $41). Flying from Greenville to Islip, New York in December is currently the most expensive (average of $78). 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
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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 March 17, 2026.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$286Average$366FlexibilityNo cancel feeOn-time63%

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