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$313+ Cheap flights from Islip, NY to Louisville (ISP - SDF)

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 2/25. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SDF
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap flight deals from Islip to Louisville

Cheapest flights from Islip to Louisville
Explore the most affordable flight options available from Islip to Louisville. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 29, 2026.

This KAYAK deal was found by Cheapflights users on 1/27. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/2512:40 pm
ISP
-
SDF
1 stop10h 05m
Southwest
Sat 2/284:25 pm
SDF
-
ISP
1 stop6h 20m
Southwest
Deal found 1/27$313
This Southwest deal was found by Cheapflights users on 1/26. 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 2/215:30 am
ISP
-
SDF
1 stop6h 50m
Southwest
Tue 2/2411:05 am
SDF
-
ISP
2 stops10h 50m
Southwest
Deal found 1/26$319
This Southwest deal was found by Cheapflights users on 1/26. 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.
Sun 2/225:35 pm
ISP
-
SDF
1 stop7h 10m
Southwest
Tue 2/246:45 am
SDF
-
ISP
2 stops9h 30m
Southwest
Deal found 1/26$354
This Southwest deal was found by Cheapflights users on 1/27. 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.
Wed 2/43:45 pm
ISP
-
SDF
1 stop7h 00m
Southwest
Wed 2/185:35 am
SDF
-
ISP
1 stop6h 20m
Southwest
Deal found 1/27$366
This Kiwi.com deal was found by Cheapflights users on 1/29. 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 4/304:07 pm
ISP
-
SDF
1 stop19h 31m
Multiple Airlines
Sun 5/38:14 pm
SDF
-
ISP
2 stops17h 17m
Multiple Airlines
Deal found 1/29$674

Find flight deals from Islip to Louisville

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to Louisville (SDF). 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 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$313
(KAYAK)

Popular in

December

Cheapest in

July

Average price

$319
Provider with most accurate pricing for Islip Long Island-Louisville Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Islip Long Island-Louisville Intl flights.
Search Deals
From Islip Long Island to Louisville Intl
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($39 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to Louisville 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 29, 2026.
Use the filters below to find and compare flights from Islip to Louisville that are best for you.

Fly from

Islip

Fly to

Louisville

Route

Depart

Return

Price

IslipLouisville

ISP - SDF

ISPSDF

Islip Long Island

Wed 2/25

12:40 pm-10:45 pm

1 stop10h 05m

Louisville Intl

Sat 2/28

4:25 pm-10:45 pm

1 stop6h 20m

$313

IslipLouisville

ISP - SDF

ISPSDF

Islip Long Island

Sat 2/21

5:30 am-12:20 pm

1 stop6h 50m

Louisville Intl

Tue 2/24

11:05 am-9:55 pm

2 stops10h 50m

$319

IslipLouisville

ISP - SDF

ISPSDF

Islip Long Island

Sun 2/22

5:35 pm-12:45 am

1 stop7h 10m

Louisville Intl

Tue 2/24

6:45 am-4:15 pm

2 stops9h 30m

$354

IslipLouisville

ISP - SDF

ISPSDF

Islip Long Island

Thu 4/30

4:07 pm-11:38 am

1 stop19h 31m

Louisville Intl

Sun 5/3

8:14 pm-1:31 pm

2 stops17h 17m

$674

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

Compare providers for flights from Islip to Louisville

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 Islip to Louisville in January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*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 Islip, New York-Louisville flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Islip, New York-Louisville flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Islip, New York-Louisville flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Islip, New York-Louisville flights, Cheapflights users trust FlightHub the most. FlightHub 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 Islip, New York-Louisville 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 Islip to Louisville

Have a flexible travel schedule? Discover the best time to fly to Louisville from Islip 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 Islip to Louisville

What is the cheapest month to book a flight from Islip, New York to Louisville?

Currently, April is the cheapest month in which you can book a flight from Islip, New York to Louisville (average of $60). Flying from Islip, New York to Louisville in September is currently the most expensive (average of $152). 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.

Related info for your journey

Find useful and relevant information for your journey from Islip to Louisville. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Islip, New York to Louisville?

    There are many flights that can get you from Islip, New York to Louisville in 10h 05m. Fly via Southwest to get the fastest option. Islip, New York and Louisville are separated by a distance of 697 mi.

  • Can I find deals for flights from Islip to Louisville that include hotel bookings?

    Yes. In addition to deals on Islip to Louisville flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Islip to Louisville?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Louisville.

  • Can I find deals for business class flights from Islip to Louisville?

    Yes. Cheapflights offers flight deals from Islip to Louisville 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 Islip, New York to Louisville?

    Currently, April is the cheapest month in which you can book a flight from Islip, New York to Louisville (average of $60). Flying from Islip, New York to Louisville in September is currently the most expensive (average of $152). 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 Louisville?

Book flights to Louisville if you plan to visit one of these locations
Shepherdsville
Jeffersonville
Elizabethtown
Corydon
Bardstown

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