SDF - ISP

$226 Find Cheap Flights from Louisville to Islip

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Louisville to Islip departing on 12/4. 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 Louisville 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 Louisville to Islip, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 22% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Louisville to Islip (SDF-ISP)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Louisville 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 Louisville to Islip

Thu, Dec 4 - Mon, Dec 8
Multiple Airlines Logo
6:00 am - 9:11 amSDF-ISP
27h 11m1 stop
Multiple Airlines Logo
9:09 pm - 11:45 pmISP-SDF
26h 36m1 stop
$226Multiple Airlines
Find Deal
Thu, Dec 4 - Mon, Dec 8
Southwest Logo
3:20 pm - 10:05 pmSDF-ISP
6h 45m1 stop
Southwest Logo
12:55 pm - 11:05 pmISP-SDF
10h 10m2 stops
$232Southwest
Find Deal
Thu, Dec 4 - Mon, Dec 8
Southwest Logo
12:55 pm - 10:05 pmSDF-ISP
9h 10m2 stops
Southwest Logo
12:55 pm - 11:05 pmISP-SDF
10h 10m2 stops
$237Southwest
Find Deal
Tue, Sep 30 - Sat, Oct 4
Multiple Airlines Logo
10:14 am - 10:40 amSDF-ISP
24h 26m1 stop
Multiple Airlines Logo
5:05 pm - 8:58 amISP-SDF
39h 53m2 stops
$357Multiple Airlines
Find Deal
Tue, Sep 30 - Sat, Oct 4
Multiple Airlines Logo
10:14 am - 10:40 amSDF-ISP
24h 26m1 stop
Multiple Airlines Logo
5:05 pm - 10:47 pmISP-SDF
29h 42m1 stop
$365Multiple Airlines
Find Deal
Fri, Sep 26 - Sun, Oct 5
Breeze Airways Logo
8:52 pm - 6:52 pmSDF-ISP
22h 00m2 stops
Breeze Airways Logo
7:36 pm - 8:58 amISP-SDF
13h 22m2 stops
$737Breeze Airways
Find Deal
Fri, Sep 26 - Thu, Oct 2
Breeze Airways Logo
8:52 pm - 6:52 pmSDF-ISP
22h 00m2 stops
Breeze Airways Logo
7:36 pm - 8:58 amISP-SDF
13h 22m2 stops
$755Breeze Airways
Find Deal
Fri, Sep 26 - Wed, Oct 1
Breeze Airways Logo
8:52 pm - 6:52 pmSDF-ISP
22h 00m2 stops
Breeze Airways Logo
8:45 pm - 7:16 pmISP-SDF
22h 31m1 stop
$764Breeze Airways
Find Deal
Fri, Sep 26 - Sat, Oct 4
Breeze Airways Logo
8:52 pm - 6:52 pmSDF-ISP
22h 00m2 stops
Breeze Airways Logo
8:45 pm - 7:16 pmISP-SDF
22h 31m1 stop
$862Breeze Airways
Find Deal
Fri, Sep 26 - Wed, Oct 1
Breeze Airways Logo
8:52 pm - 6:52 pmSDF-ISP
22h 00m2 stops
Breeze Airways Logo
8:21 pm - 2:15 pmISP-SDF
17h 54m3 stops
$882Breeze Airways
Find Deal

Everything you should know

Top airlines
Southwest
Cheapest • from $232 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Cheapest round-trip
$226
Multiple Airlines
Thu 12/4Mon 12/8
SDF - ISP • 1 stop
Cheapest one-way
$506
Breeze Airways
Tue 11/25
SDF - ISP • 1 stop
Start a new search
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 Louisville to Islip flights

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

Which airlines provide the cheapest flights from Louisville to Islip?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Louisville to Islip were found on Southwest ($232) and Breeze Airways ($737).

Good to know

Low seasonAugust
Cheapest flight$226
Best time to beat the crowds with an average 25% drop in price.
Most popular time to fly and prices are also 18% lower on average.
Flight from Louisville to Islip

When to book flights from Louisville to Islip

Are your dates flexible? Find out the best times to travel from Louisville 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 Louisville to Islip

  • What is the cheapest flight from Louisville to Islip?

    In the last 3 days, the lowest price for a flight from Louisville to Islip was $506 for a one-way ticket and $226 for a round-trip.

  • Do I need a passport to fly between Louisville 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 airports will I be using when flying from Louisville to Islip?

    On your way to Islip, you’ll fly out from Louisville Intl. You’ll be landing at Islip Long Island.

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

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

  • How does KAYAK find such low prices on flights from Louisville 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 Louisville to Islip.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Islip from Louisville 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 Louisville 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 Louisville with another airline. Booking your flights between Louisville 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 Louisville 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 Louisville 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 Louisville to Islip

 
See real verified KAYAK customer reviews for airlines flying from Louisville 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 Louisville 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
8.0Comfort
8.1Boarding
7.5Entertainment
7.0Food
8.6Crew
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 Louisville to Islip

Information on your arrival and departure airports

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.