GSP - ISP

$157 Find Cheap Flights from Greenville to Islip

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Greenville to Islip departing on 10/3. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Islip

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Greenville to Islip, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Greenville to Islip, as well as popular online travel agencies
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Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Greenville to Islip (GSP-ISP)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Greenville to Islip that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Greenville to Islip

Wed, Oct 15 - Wed, Oct 22
Southwest Logo
6:05 am - 12:25 pmGSP-ISP
6h 20m1 stop
Southwest Logo
11:40 am - 7:55 pmISP-GSP
8h 15m1 stop
$282Southwest
Find Deal
Thu, Oct 16 - Thu, Oct 23
Breeze Airways Logo
8:03 pm - 6:28 pmGSP-ISP
22h 25m1 stop
Breeze Airways Logo
11:40 am - 8:44 pmISP-GSP
9h 04m2 stops
$323Breeze Airways
Find Deal
Thu, Oct 9 - Sun, Oct 12
Breeze Airways Logo
8:03 pm - 6:28 pmGSP-ISP
22h 25m1 stop
Breeze Airways Logo
11:40 am - 8:44 pmISP-GSP
9h 04m2 stops
$335Breeze Airways
Find Deal
Fri, Oct 3 - Sat, Oct 4
Multiple Airlines Logo
8:03 pm - 10:55 amGSP-ISP
14h 52m1 stop
Multiple Airlines Logo
8:45 pm - 9:53 amISP-GSP
13h 08m1 stop
$337Multiple Airlines
Find Deal
Wed, Oct 15 - Wed, Oct 22
Southwest Logo
6:05 am - 4:20 pmGSP-ISP
10h 15m2 stops
Southwest Logo
11:40 am - 7:55 pmISP-GSP
8h 15m1 stop
$343Southwest
Find Deal
Thu, Oct 16 - Thu, Oct 23
Multiple Airlines Logo
8:03 pm - 6:28 pmGSP-ISP
22h 25m1 stop
Multiple Airlines Logo
9:37 pm - 7:23 pmISP-GSP
21h 46m1 stop
$348Multiple Airlines
Find Deal
Thu, Oct 9 - Sun, Oct 12
Southwest Logo
1:50 pm - 11:45 pmGSP-ISP
9h 55m1 stop
Southwest Logo
5:25 am - 10:40 amISP-GSP
5h 15m1 stop
$402Southwest
Find Deal
Wed, Oct 15 - Wed, Oct 22
Southwest Logo
6:05 am - 4:20 pmGSP-ISP
10h 15m2 stops
Southwest Logo
6:00 am - 6:30 pmISP-GSP
12h 30m2 stops
$403Southwest
Find Deal
Thu, Oct 9 - Mon, Oct 13
Southwest Logo
1:50 pm - 10:10 pmGSP-ISP
8h 20m2 stops
Southwest Logo
5:30 am - 9:55 amISP-GSP
4h 25m1 stop
$512Southwest
Find Deal
Thu, Nov 6 - Sun, Nov 9
Breeze Airways Logo
8:03 pm - 6:28 pmGSP-ISP
22h 25m1 stop
Breeze Airways Logo
11:40 am - 9:14 pmISP-GSP
9h 34m2 stops
$536Breeze Airways
Find Deal

Everything you should know

Top airlines
Southwest
Cheapest • from $282 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
April
Cheapest • 28% price drop
October
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$282
Overall average: $381
Southwest
Wed 10/15Wed 10/22
GSP - ISP • 1 stop
Cheapest one-way
$157
Multiple Airlines
Fri 10/3
GSP - ISP • 1 stop
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Islip!
Booking Insights

KAYAK's insights & trends for Greenville to Islip flights

Get data-powered insights and trends into flights from Greenville to Islip to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Greenville to Islip?

The average price of all round-trip flights from Greenville to Islip clicked on KAYAK for each day over the last 12 months.

When flying from Greenville to Islip, you should consider leaving on a Wednesday and avoid Thursdays if you are looking for the best rates. For your return to Greenville, you’ll find the best rates on Wednesdays and the most expensive ones on Tuesdays.

What is the cheapest month to fly from Greenville to Islip?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Greenville to Islip, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Greenville to Islip is April, where tickets cost $286 (return) on average. On the other hand, the most expensive months are May and December, where the average cost of round-trip tickets is $706 and $446 respectively.

Find deals

Good to know

Low seasonMay
Cheapest flight$157
Best time to beat the crowds but there is an average 77% increase in price.
Most popular time to fly and prices are also 5% lower on average.
Flight from Greenville to Islip

When to book flights from Greenville to Islip

Are your dates flexible? Find out the best times to travel from Greenville to Islip based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Greenville to Islip

  • What is the cheapest flight from Greenville to Islip?

    In the last 3 days, the lowest price for a flight from Greenville to Islip was $157 for a one-way ticket and $282 for a round-trip.

  • Do I need a passport to fly between Greenville and Islip?

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which aircraft models fly most regularly from Greenville to Islip?

    We unfortunately don’t have that data for this specific route.

  • How does KAYAK find such low prices on flights from Greenville to Islip?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Greenville to Islip.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Greenville to Islip?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Islip from Greenville is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Greenville to Islip?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Islip with an airline and back to Greenville with another airline. Booking your flights between Greenville and ISP can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Greenville to Islip?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Islip from Greenville up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Greenville to Islip

 
See real verified KAYAK customer reviews for airlines flying from Greenville to Islip. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Greenville to Islip? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4242 reviews
7.5Entertainment
8.1Boarding
8.0Comfort
8.6Crew
7.0Food
Airline reviews

I wish they had movie screens in the headrests. The seats are much improved, more legroom and recently renovated. Bathroom was clean. Staff was outstanding!!

10.0 ExcellentG, Sep 2025LAS - ATL
Read more Southwest reviews

I wish they had movie screens in the headrests. The seats are much improved, more legroom and recently renovated. Bathroom was clean. Staff was outstanding!!

As always, the entire Southwest experience was wonderful, from online booking to flight to baggage retrieval. Very grateful.

The weather could have been better. There was a 40 minute ATC delay in SFO because of marine fog and a micro cell storm delayed landing and take-off at Nashville. The gate was changed 5 minutes from boarding from gate B3 to gate C23 at Nashville airport.

After being assaulted by a flight attendant I was then brushed off as oh well because he long braids didn’t mean to whip me in the eye. I have filed complaints and will see. But like any other issue I’ve had with kayak involved it’s been trash. Last time I’ll be using your app

AC sub par. WiFi not working correctly. Ac sucked. Seats very narrow.

Near 4 hour flight with only 1 service. Had to use call button to request water. Internet and power not working until into flight. Internet would stop working during flight.

Southwest's seats are the least comfortable I have ever sat in.

The cabin was quiet for the redeye flight. The area was clean. The staff was great. The 787 Max was in good condition. Drawbacks were that the seat widths were tight for some passengers. The seat padding was at best average and for a long flight uncomfortable.

Southwest like most American domestic airlines, is a mediocre airline. But it is among the cheapest. Oh well.

My flight was delayed 50 minutes and we were rushed to board to then sit for 15 minutes until the pilot arrived. Unacceptable since we could have waited to board. Also the delayed flight was updated AFTER we boarded to more than the 10 minutes as originally stated.

Everything you need to know for your flight from Greenville to Islip

Information on your arrival and departure airports

Greenville (GSP)
Islip (ISP)

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