HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Louisville

$114+ Cheap flights from Islip, NY to Louisville (ISP - SDF)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/27. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SDF
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Islip to Louisville with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Find 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 October 30, 2025.

This Southwest deal was found by Cheapflights users on 10/30. 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.
Tue 12/305:50 pmISP - SDF
1 stop6h 40mSouthwest
Fri 1/25:45 pmSDF - ISP
1 stop6h 10mSouthwest
Deal found 10/30$483

Cheap 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 October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$232
(Southwest)

One-way from

$114
(Southwest)

Popular in

December

Cheapest in

January

Average price

$379
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
One-way flight from Islip Long Island to Louisville Intl
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($25 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
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 October 30, 2025.
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

Thu 1/22

3:45 pm-10:45 pm

1 stop7h 00m

Louisville Intl

Mon 2/2

12:50 pm-9:55 pm

2 stops9h 05m

$232

IslipLouisville

ISP - SDF

ISPSDF

Islip Long Island

Tue 12/30

5:50 pm-12:30 am

1 stop6h 40m

Louisville Intl

Fri 1/2

5:45 pm-11:55 pm

1 stop6h 10m

$483

IslipLouisville

ISP - SDF

ISPSDF

Islip Long Island

Tue 3/24

11:59 am-1:26 pm

2 stops49h 27m

Louisville Intl

Thu 3/26

8:14 pm-6:40 pm

1 stop22h 26m

$738

IslipLouisville

ISP - SDF

ISPSDF

Islip Long Island

Tue 1/27

3:45 pm-10:45 pm

1 stop7h 00m

$114

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

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 October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Islip, New York-Louisville flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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, January is the cheapest month in which you can book a flight from Islip, New York to Louisville (average of $46). 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 7h. 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, January is the cheapest month in which you can book a flight from Islip, New York to Louisville (average of $46). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Islip to Louisville

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Nashville flights
LaGuardia to Nashville flights
Newark to Nashville flights
John F Kennedy Intl to Cincinnati flights
LaGuardia to Cincinnati flights
Newark to Cincinnati flights
LaGuardia to Knoxville flights
Newark to Louisville flights
LaGuardia to Louisville flights
John F Kennedy Intl to Knoxville flights
John F Kennedy Intl to Louisville flights
Stewart to Nashville flights
Newark to Knoxville flights
Buffalo to Nashville flights
Albany to Nashville flights
White Plains to Nashville flights
Newark to Lexington flights
LaGuardia to Lexington flights
Rochester to Nashville flights
John F Kennedy Intl to Lexington flights
Syracuse to Nashville flights
Syracuse to Cincinnati flights
Stewart to Cincinnati flights
Rochester to Louisville flights
Stewart to Knoxville flights
Albany to Lexington flights
Syracuse to Knoxville flights
Islip to Nashville flights
John F Kennedy Intl to Blountville flights
Ithaca to Cincinnati flights
Newark to Blountville flights
Islip to Cincinnati flights
LaGuardia to Blountville flights
White Plains to Cincinnati flights
Stewart to Louisville flights
Albany to Knoxville flights
Rochester to Knoxville flights
Elmira to Cincinnati flights
Buffalo to Knoxville flights
Rochester to Cincinnati flights
White Plains to Knoxville flights
White Plains to Lexington flights
Syracuse to Lexington flights
Syracuse to Louisville flights
Albany to Louisville flights
White Plains to Louisville flights
Albany to Cincinnati flights
Buffalo to Cincinnati flights
Binghamton to Cincinnati flights
Islip to Knoxville flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.