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Islip

$386+ Cheap flights from Louisville to Islip, NY (SDF - ISP)

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 2/12. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — ISP
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap flight deals from Louisville to Islip

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

This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/122:26 pm
SDF
-
ISP
1 stop23h 05m
Multiple Airlines
Mon 2/163:34 pm
ISP
-
SDF
2 stops23h 04m
Multiple Airlines
Deal found 1/27$386
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.
Thu 2/125:30 am
SDF
-
ISP
1 stop6h 45m
Southwest
Mon 2/165:35 pm
ISP
-
SDF
1 stop7h 10m
Southwest
Deal found 1/27$459
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.
Sat 4/45:30 am
SDF
-
ISP
1 stop6h 10m
Southwest
Sat 4/46:00 pm
ISP
-
SDF
1 stop6h 10m
Southwest
Deal found 1/27$591

Find flight deals from Louisville to Islip

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

$386
(Kiwi.com)

Popular in

February

Cheapest in

August

Average price

$278
Provider with most accurate pricing for Louisville Intl-Islip Long Island flight deals.
Search Deals
Provider most trusted by Cheapflights users for Louisville Intl-Islip Long Island flights.
Search Deals
From Louisville Intl to Islip Long Island
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($58 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($17 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 Louisville to Islip 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 Louisville to Islip that are best for you.

Fly from

Louisville

Fly to

Islip

Route

Depart

Return

Price

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Thu 2/12

5:30 am-12:15 pm

1 stop6h 45m

Islip Long Island

Mon 2/16

5:35 pm-12:45 am

1 stop7h 10m

$459

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Sat 4/4

5:30 am-11:40 am

1 stop6h 10m

Islip Long Island

Sat 4/4

6:00 pm-12:10 am

1 stop6h 10m

$591

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

Compare providers for flights from Louisville to Islip

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

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

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

Currently, May is the cheapest month in which you can book a flight from Louisville to Islip, New York (average of $71). Flying from Louisville to Islip, New York in January is currently the most expensive (average of $131). 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 Islip

Get insights into the airlines that provide service to Islip. 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 Islip. Reviews last updated January 29, 2026.
Get a feel of what it's like to fly with Southwest from Louisville to Islip by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,267 reviews

Comfort

8.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
8.0
Very good
4,267 reviews
Southwest
8.0
Very good
4,267 reviews

Comfort

8.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.5

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Related info for your journey

Find useful and relevant information for your journey from Louisville to Islip. 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 Louisville to Islip, New York?

    A quick flight from Louisville to Islip, New York can take about 6h 45m. Southwest provides one of the quickest options available for as low as $459. There are 697 mi between Louisville and Islip, New York.

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

    Our cheapest airline available from Louisville to Islip, New York is Southwest. Our recent data shows that you can find tickets from as low as $276 on this airline. You may be able to fly from Louisville to Islip, New York for 18% less than the average price by searching for this airline.

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

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

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

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

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

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

    Currently, May is the cheapest month in which you can book a flight from Louisville to Islip, New York (average of $71). Flying from Louisville to Islip, New York in January is currently the most expensive (average of $131). 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?

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Riverhead

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Top airline flying from Louisville to Islip

Discover the top airline that operate flights from Louisville to Islip. 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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$276Average$316FlexibilityNo cancel feeOn-time63%

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