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Islip

$337+ 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 9/1. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — ISP
Apr 23 — Apr 301
Thu 4/23
Thu 4/30
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 March 24, 2026.

This Southwest deal was found by Cheapflights users on 3/19. 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 9/15:30 am
SDF
-
ISP
1 stop6h 40m
Southwest
Tue 9/83:20 pm
ISP
-
SDF
1 stop6h 10m
Southwest
Deal found 3/19$337
This KAYAK deal was found by Cheapflights users on 3/21. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/282:27 pm
SDF
-
ISP
1 stop23h 01m
Breeze Airways
Sat 5/3011:57 am
ISP
-
SDF
1 stop25h 30m
Breeze Airways
Deal found 3/21$608
This KAYAK deal was found by Cheapflights users on 3/23. 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 5/212:27 pm
SDF
-
ISP
1 stop23h 01m
Breeze Airways
Tue 5/265:27 pm
ISP
-
SDF
1 stop15h 09m
Breeze Airways
Deal found 3/23$618
This Southwest deal was found by Cheapflights users on 3/23. 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 3/244:30 pm
SDF
-
ISP
1 stop6h 20m
Southwest
Thu 3/265:55 pm
ISP
-
SDF
1 stop6h 45m
Southwest
Deal found 3/23$703
This KAYAK deal was found by Cheapflights users on 3/19. 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.
Sun 5/312:10 pm
SDF
-
ISP
2 stops25h 21m
Breeze Airways
Thu 5/77:53 pm
ISP
-
SDF
2 stops12h 53m
Breeze Airways
Deal found 3/19$812

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 March 24, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$337
(Southwest)

Popular in

December

Cheapest in

July

Average price

$279
Provider with most accurate pricing for Louisville Intl-Islip Long Island flight deals.
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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. 10% potential increase in price ($34 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
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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 March 24, 2026.
Use the filters below to find and compare flights from Louisville to Islip that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Tue 9/1

5:30 am-12:10 pm

1 stop6h 40m

Islip Long Island

Tue 9/8

3:20 pm-9:30 pm

1 stop6h 10m

$337

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Thu 5/28

6:55 pm-1:28 pm

2 stops18h 33m

Islip Long Island

Sat 5/30

11:57 am-1:27 pm

1 stop25h 30m

$614

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Thu 5/21

2:27 pm-1:28 pm

1 stop23h 01m

Islip Long Island

Tue 5/26

5:27 pm-8:36 am

1 stop15h 09m

$618

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Thu 5/21

2:27 pm-1:28 pm

1 stop23h 01m

Islip Long Island

Mon 5/25

8:31 pm-8:36 am

2 stops36h 05m

$853

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Sun 5/3

12:10 pm-1:31 pm

2 stops25h 21m

Islip Long Island

Mon 5/4

7:20 pm-8:36 am

2 stops37h 16m

$1,002

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Sat 8/1

9:21 am-7:09 pm

2 stops33h 48m

Islip Long Island

Mon 8/31

8:31 pm-8:36 am

2 stops36h 05m

$1,088

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Sat 5/23

9:21 am-7:13 pm

2 stops33h 52m

Islip Long Island

Mon 5/25

8:31 pm-8:36 am

2 stops36h 05m

$1,223
Cheapest one-way

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Sun 5/3

12:10 pm-1:31 pm

2 stops25h 21m

$469
Quickest one-way

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Sun 3/29

2:26 pm-1:31 pm

1 stop23h 05m

$520

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/19

Sorted by cheapest first

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 March.
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, April is the cheapest month in which you can book a flight from Louisville to Islip, New York (average of $69). Flying from Louisville to Islip, New York in February is currently the most expensive (average of $169). 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 March 24, 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
4,331 reviews

Entertainment

7.5

Comfort

8.0

Overall

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Southwest
8.0
Very good
4,331 reviews
Southwest
8.0
Very good
4,331 reviews

Entertainment

7.5

Comfort

8.0

Overall

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

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 40m. Southwest provides one of the quickest options available for as low as $337. There are 697 mi between Louisville and Islip, New York. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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.

  • 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, April is the cheapest month in which you can book a flight from Louisville to Islip, New York (average of $69). Flying from Louisville to Islip, New York in February is currently the most expensive (average of $169). 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
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 March 24, 2026.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$276Average$316FlexibilityNo cancel feeOn-time63%

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