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$324+ 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 9/11. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SDF
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
1 adult, Economy
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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 July 29, 2025.

Round-trip from

$324
(Southwest)

Popular in

December

Cheapest in

January

Average price

$313
From Islip Long Island to Louisville Intl
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($27 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 July 2025
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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 July 29, 2025.

This Southwest deal was found by Cheapflights users on 7/26. 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.
Thu 9/113:05 pmISP - SDF
1 stop8h 25mSouthwest
Sun 9/145:45 amSDF - ISP
1 stop6h 45mSouthwest
Deal found 7/26$324
This KAYAK deal was found by Cheapflights users on 7/27. 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.
Thu 10/167:36 pmISP - SDF
2 stops13h 22mBreeze Airways
Sun 10/197:32 pmSDF - ISP
1 stop22h 56mBreeze Airways
Deal found 7/27$600
This Mytrip deal was found by Cheapflights users on 7/26. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/117:36 pmISP - SDF
3 stops26h 52mMultiple Airlines
Sun 9/143:10 pmSDF - ISP
3 stops22h 35mMultiple Airlines
Deal found 7/26$711

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 July 29, 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 9/11

3:05 pm-11:30 pm

1 stop8h 25m

Louisville Intl

Sun 9/14

5:45 am-12:30 pm

1 stop6h 45m

$324

IslipLouisville

ISP - SDF

ISPSDF

Islip Long Island

Thu 10/16

7:36 pm-8:58 am

2 stops13h 22m

Louisville Intl

Sun 10/19

7:32 pm-6:28 pm

1 stop22h 56m

$600

IslipLouisville

ISP - SDF

ISPSDF

Islip Long Island

Thu 9/11

7:36 pm-10:28 pm

3 stops26h 52m

Louisville Intl

Sun 9/14

3:10 pm-1:45 pm

3 stops22h 35m

$711

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/26

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 $299). Flying from Islip, New York to Louisville in April is currently the most expensive (average of $369). 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.

Reviews of airlines servicing Louisville

Get insights into the airlines that provide service to Louisville. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Louisville. Reviews last updated July 29, 2025.
Peruse reviews from past customers who have flown with Southwest and Breeze Airways from Islip to Louisville to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,238 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Breeze Airways
8.0
Very good
190 reviews
Southwest
8.0
Very good
4,238 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Comfort

8.0

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

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.

  • What are the cheapest airlines flying from Islip, New York to Louisville round-trip?

    According to our current data, Southwest ($324), and Breeze Airways ($600) offers the cheapest pricing from Islip, New York to Louisville.

  • 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 $299). Flying from Islip, New York to Louisville in April is currently the most expensive (average of $369). 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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Top airline flying from Islip to Louisville

Discover the top airline that operate flights from Islip to Louisville. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$296Average$386FlexibilityNo cancel feeOn-time63%

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