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$333+ 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 8/9. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — SDF
Jun 28 — Jul 51
Sat 6/28
Sat 7/5
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 June 23, 2025.

Round-trip from

$333
(Southwest)

Popular in

December

Cheapest in

January

Average price

$335
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 June 2025
Search Deals

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 June 23, 2025.

This Southwest deal was found by Cheapflights users on 6/21. 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 8/912:15 pmISP - SDF
1 stop10h 10mSouthwest
Sat 8/235:50 amSDF - ISP
1 stop6h 15mSouthwest
Deal found 6/21$333
This Mytrip deal was found by Cheapflights users on 6/21. 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.
Mon 7/77:30 amISP - SDF
2 stops16h 08mMultiple Airlines
Fri 7/112:50 pmSDF - ISP
3 stops22h 42mMultiple Airlines
Deal found 6/21$945

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 June 23, 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

Sat 8/9

12:15 pm-10:25 pm

1 stop10h 10m

Louisville Intl

Sat 8/23

5:50 am-12:05 pm

1 stop6h 15m

$333

IslipLouisville

ISP - SDF

ISPSDF

Islip Long Island

Mon 7/7

7:30 am-11:38 pm

2 stops16h 08m

Louisville Intl

Fri 7/11

2:50 pm-1:32 pm

3 stops22h 42m

$945

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/21

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.

Rainfall in Louisville by month

Plan your trip to Louisville by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Louisville ranges from 3.1 - 5.3 inches per month. May is typically the wettest month, when rainfall can reach 5.3 in. September is typically the driest time to visit Louisville when rainfall is around 3.1 in.

Temperature in Louisville by month

Plan your trip to Louisville by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Louisville, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

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 June 23, 2025.
Southwest
8.0
Very good
4,278 reviews

Entertainment

7.6

Boarding

8.2

Crew

8.6

Comfort

8.0

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Southwest
8.0
Very good
4,278 reviews
Southwest
8.0
Very good
4,278 reviews

Entertainment

7.6

Boarding

8.2

Crew

8.6

Comfort

8.0

Food

7.0

Overall

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

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 is the cheapest airline to fly from Islip, New York to Louisville round-trip?

    According to our current data, Southwest ($333), 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 Islip?

Book flights to Islip 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 June 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$296Average$386FlexibilityNo cancel feeOn-time63%

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