GSP - ISP

$350 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 12/26. 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, 0 bags

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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Everything you should know

Cheapest round-trip
$350
Southwest
Wed 3/11Sun 3/15
GSP - ISP • 1 stop
Cheapest one-way
$228
Multiple Airlines
Fri 12/26
GSP - ISP • 1 stop
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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, Mar 11 - Sun, Mar 15
Southwest Logo
8:00 am - 11:45 am
GSP
-
ISP
3h 45m1 stop
Southwest Logo
5:55 pm - 9:45 pm
ISP
-
GSP
3h 50m1 stop
$350Southwest
Wed, Mar 11 - Sun, Mar 15
Southwest Logo
6:20 am - 4:05 pm
GSP
-
ISP
9h 45m2 stops
Southwest Logo
5:55 pm - 9:45 pm
ISP
-
GSP
3h 50m1 stop
$355Southwest
Wed, Mar 11 - Sun, Mar 15
Southwest Logo
6:20 am - 4:05 pm
GSP
-
ISP
9h 45m2 stops
Southwest Logo
11:45 am - 11:25 pm
ISP
-
GSP
11h 40m2 stops
$366Southwest
Wed, Jan 7 - Sun, Jan 11
Southwest Logo
6:15 pm - 9:55 pm
GSP
-
ISP
3h 40m1 stop
Southwest Logo
5:55 am - 10:10 am
ISP
-
GSP
4h 15m1 stop
$387Southwest
Fri, Dec 26 - Wed, Dec 31
Multiple Airlines Logo
8:03 pm - 5:55 pm
GSP
-
ISP
21h 52m1 stop
Multiple Airlines Logo
5:27 pm - 10:53 am
ISP
-
GSP
17h 26m1 stop
$391Multiple Airlines
Wed, Jan 7 - Sun, Jan 11
Southwest Logo
11:15 am - 9:55 pm
GSP
-
ISP
10h 40m2 stops
Southwest Logo
4:05 pm - 8:20 pm
ISP
-
GSP
4h 15m1 stop
$392Southwest
Wed, Jan 7 - Sun, Jan 11
Southwest Logo
11:15 am - 9:55 pm
GSP
-
ISP
10h 40m2 stops
Southwest Logo
5:55 am - 6:00 pm
ISP
-
GSP
12h 05m2 stops
$419Southwest
Fri, Dec 26 - Tue, Jan 20
Multiple Airlines Logo
8:03 pm - 5:55 pm
GSP
-
ISP
21h 52m1 stop
Multiple Airlines Logo
12:00 pm - 4:15 pm
ISP
-
GSP
52h 15m2 stops
$436Multiple Airlines
Sat, Dec 27 - Wed, Dec 31
Multiple Airlines Logo
4:02 pm - 1:09 pm
GSP
-
ISP
21h 07m1 stop
Multiple Airlines Logo
5:27 pm - 10:53 am
ISP
-
GSP
17h 26m1 stop
$463Multiple Airlines
Fri, Dec 26 - Wed, Dec 31
Multiple Airlines Logo
8:03 pm - 5:55 pm
GSP
-
ISP
21h 52m1 stop
Multiple Airlines Logo
4:40 pm - 1:26 pm
ISP
-
GSP
20h 46m2 stops
$472Multiple Airlines
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.

Find deals

Good to know

Low seasonApril
Cheapest flight$228
Best time to beat the crowds with an average 28% drop in price.
Most popular time to fly with an average 3% increase in price.
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 $228 for a one-way ticket and $350 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.
7.9
SouthwestOverall score based on 4250 reviews
8.0Comfort
7.0Food
7.5Entertainment
8.6Crew
8.1Boarding
Airline reviews

They sent a notice that they were boarding an hour early. We had to leave the club and run to the gate. They said sorry, that came from corporate and was a mistake. They did not have enough seating because the flight before it had not taken off on time. They moved our gate and delayed it for an hour.

2.0 MediocreRobert, Dec 2025
LAS - TPA
Read more Southwest reviews

They sent a notice that they were boarding an hour early. We had to leave the club and run to the gate. They said sorry, that came from corporate and was a mistake. They did not have enough seating because the flight before it had not taken off on time. They moved our gate and delayed it for an hour.

The boarding and seat assignment system no longer works for me, but I know it is being replaced. Otherwise, I am good with the overall experience.

The lead steward kept singing about "San Francisco" and hotel California---more annoying than humorous....needs work. Flight was smooth and on time.

Still a fan of open seating. Flight was on schedule and arrived on time. The 737 MAX is very comfortable.

Airline travel is always too cramped to really be pleasant, but the cabin crew on this flight did a pretty good job of making up for it by putting on some music during boarding and sprinkling a few funny remarks into the safety briefing and announcements, and just generally being friendly and helpful. It definitely reminded me of why I prefer the in-flight experience on Southwest!

No delays and arrived to destination 30 min early. Staff was super friendly.

San Diego airport is brand new, spacious, airy and very smooth checkin at SW baggage drop.

It was rough. The staff was unprofessional, the choice of on board drinks terrible, it was cramped in space at every airport, they always ran out of overhead bin space so they pressured people to check bags for free or we couldn’t leave on the plane— so I did check my bag to help, and they nearly lost my bag. My bag did not arrive on the luggage belt, another man on my flight and I had to waste our time going to the baggage office to search for our bags. I would only fly southwest again if it was my last choice. Also, my flights were consistently delayed over and over again— at one point they straight up told us we were waiting for the pilot to arrive.

Crew could have been friendlier, maybe I'm spoiled by SW crews. In flight wifi was good. Would be nice to have more food offerings on a 4 plus hour flight

Had to get off plane from prior flight even though I had to reboard same plane to continue to my final destination.

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

Information on your arrival and departure airports

Greenville (GSP)
Islip (ISP)