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Islip

$225+ Cheap flights from Greenville to Islip, NY (GSP - ISP)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/27. Fares are subject to change and may not be available on all flights or dates of travel.
GSP — ISP
Feb 18 — Feb 251
Wed 2/18
Wed 2/25
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 January 19, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$225
(Kiwi.com)

Popular in

May

Cheapest in

April

Average price

$249
Provider with most accurate pricing for Greenville-Islip Long Island flight deals.
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Provider most trusted by Cheapflights users for Greenville-Islip Long Island flights.
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From Greenville to Islip Long Island
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($53 potential increase over avg. RT price).
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Cheapest flight prices on average. 9% potential price decrease ($34 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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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 January 19, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/19. 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 2/278:18 pm
GSP
-
ISP
1 stop14h 48m
Multiple Airlines
Wed 3/49:33 am
ISP
-
GSP
2 stops30h 18m
Multiple Airlines
Deal found 1/19$225
This Kiwi.com deal was found by Cheapflights users on 1/18. 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 2/2612:53 pm
GSP
-
ISP
1 stop18h 45m
Multiple Airlines
Sun 3/15:51 pm
ISP
-
GSP
1 stop25h 47m
Multiple Airlines
Deal found 1/18$240
This Kiwi.com deal was found by Cheapflights users on 1/18. 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.
Sun 2/155:17 pm
GSP
-
ISP
2 stops14h 21m
Multiple Airlines
Sun 2/228:21 pm
ISP
-
GSP
1 stop23h 17m
Multiple Airlines
Deal found 1/18$285
This Southwest deal was found by Cheapflights users on 1/18. 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 2/106:15 pm
GSP
-
ISP
1 stop3h 40m
Southwest
Thu 2/125:35 pm
ISP
-
GSP
1 stop4h 10m
Southwest
Deal found 1/18$356
This Southwest deal was found by Cheapflights users on 1/18. 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 3/141:55 pm
GSP
-
ISP
1 stop9h 40m
Southwest
Sun 3/2211:45 am
ISP
-
GSP
1 stop10h 00m
Southwest
Deal found 1/18$378
This Southwest deal was found by Cheapflights users on 1/18. 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 2/2610:50 am
GSP
-
ISP
2 stops6h 10m
Southwest
Sun 3/15:35 am
ISP
-
GSP
2 stops13h 30m
Southwest
Deal found 1/18$383

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 January 19, 2026.
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

Fri 2/27

8:18 pm-11:06 am

1 stop14h 48m

Islip Long Island

Wed 3/4

9:33 am-3:51 pm

2 stops30h 18m

$225

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Thu 2/26

12:53 pm-7:38 am

1 stop18h 45m

Islip Long Island

Sun 3/1

5:51 pm-7:38 pm

1 stop25h 47m

$240

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Sun 2/15

5:17 pm-7:38 am

2 stops14h 21m

Islip Long Island

Sun 2/22

8:21 pm-7:38 pm

1 stop23h 17m

$285

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Tue 2/10

6:15 pm-9:55 pm

1 stop3h 40m

Islip Long Island

Thu 2/12

5:35 pm-9:45 pm

1 stop4h 10m

$356

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Sat 3/14

1:55 pm-11:35 pm

1 stop9h 40m

Islip Long Island

Sun 3/22

11:45 am-9:45 pm

1 stop10h 00m

$378

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Sun 2/15

10:45 am-10:40 pm

2 stops11h 55m

Islip Long Island

Sun 2/22

5:35 am-7:05 pm

2 stops13h 30m

$501

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Sun 4/12

6:07 pm-1:31 pm

2 stops19h 24m

$283

GreenvilleIslip

GSP - ISP

GSPISP

Greenville

Sun 4/12

8:00 am-4:40 pm

1 stop8h 40m

$314

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/18

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 January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*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 Expedia the most. Expedia 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 $40). 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 January 19, 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
4,267 reviews

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
8.0
Very good
4,267 reviews
Southwest
8.0
Very good
4,267 reviews

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

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

    Southwest, at $282, was found to be the cheapest airline from Greenville to Islip, New York.. Southwest is priced at 27% 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 $40). 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
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 January 19, 2026.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$282Average$356FlexibilityNo cancel feeOn-time63%

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