SDF - ISP

$357 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 11/20. 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 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
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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, Nov 20 - Thu, Nov 20
Southwest Logo
5:30 am - 12:15 pmSDF-ISP
6h 45m1 stop
Southwest Logo
3:40 pm - 10:10 pmISP-SDF
6h 30m1 stop
$357Southwest
Find Deal
Sat, Mar 28 - Sun, Mar 29
Southwest Logo
5:00 pm - 11:35 pmSDF-ISP
6h 35m1 stop
Southwest Logo
12:20 pm - 7:40 pmISP-SDF
7h 20m1 stop
$405Southwest
Find Deal
Sat, Mar 28 - Sun, Mar 29
Southwest Logo
3:00 pm - 11:35 pmSDF-ISP
8h 35m2 stops
Southwest Logo
12:20 pm - 7:40 pmISP-SDF
7h 20m1 stop
$410Southwest
Find Deal
Mon, Dec 1 - Wed, Dec 31
Southwest Logo
5:35 pm - 11:55 pmSDF-ISP
6h 20m1 stop
Southwest Logo
3:55 pm - 10:50 pmISP-SDF
6h 55m1 stop
$462Southwest
Find Deal
Mon, Dec 1 - Wed, Dec 31
Southwest Logo
5:35 pm - 11:55 pmSDF-ISP
6h 20m1 stop
Southwest Logo
12:55 pm - 9:45 pmISP-SDF
8h 50m2 stops
$477Southwest
Find Deal
Mon, Dec 1 - Wed, Dec 31
Southwest Logo
6:20 am - 5:15 pmSDF-ISP
10h 55m2 stops
Southwest Logo
12:55 pm - 9:45 pmISP-SDF
8h 50m2 stops
$512Southwest
Find Deal

Everything you should know

Cheapest round-trip
$357
Southwest
Thu 11/20Thu 11/20
SDF - ISP • 1 stop
Cheapest one-way
Multiple Airlines
Sat 11/1
SDF - ISP • multi-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 fly non-stop between Louisville and Islip?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for round-trip flights from Louisville to Islip.

There is just one airline that flies from Louisville to Islip direct and that is Southwest. The best round-trip deal found from Southwest for the route is $276.

Good to know

Low seasonAugust
Cheapest flight$357
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 $357 for a round-trip ticket.

  • 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 4245 reviews
8.6Crew
7.5Entertainment
7.0Food
8.0Comfort
8.1Boarding
Airline reviews

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

8.0 ExcellentGreg, Oct 2025OAK - BUR
Read more Southwest reviews

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

Full cans of soda would be nice. A choice between two snacks would be appreciated.

Tried watching free movie and it kept freezing so I couldn’t finish.

All was good. I just had a hard time getting connected to the WiFi/internet during the flight

Sacrament staff are always polite and helpful. Airport is easy to maneuver and boarding is straightforward.

Great flight. Outstanding Service. Southwest was able to put us on a direct flight to Denver when the connection could have been affected by a later arrival to Baltimore. The direct flight was less expensive that the flight with the connection in Baltimore.

Delays delays delays. Late taking off, late landing, wait for a gate, etc.

Boarded on time but once we were ready for take off, the crew determined that, although every seat was taken, somehow someone was on the wrong flight. Delay, delay delay, announcements and ended up with one person checking EVERY ID against their passenger Manifest only to figure out it was a "clerical error." We departed 54 minutes late causing me to run in the St. Louis Airport to make my connection and lose the priority boarding spot I had paid for. Unnecessary delay.

I was re-booked onto another flight because my original flight was delayed and I would have missed my connector. I ended up in the “C” group after paying extra to be in the “A “ group on the original flight. At least if you’re going to re-book people, re-book them into the same group.

Flight was delayed due to plane not passing inspection And one of the crew had to time out and we had to wait for another one A 3 hour delay

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

Information on your arrival and departure airports

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