HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Islip

$239+ Cheap flights from Louisville to Islip, NY (SDF - ISP)

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 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — ISP
Sep 13 — Sep 201
Sun 9/13
Sun 9/20
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Louisville to Islip 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.

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 August 14, 2026.

This Southwest deal was found by Cheapflights users on 8/12. 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 9/121:15 pm -
1 stop6h 20m
Sat 9/1911:55 am -
1 stop9h 30m
Deal found 8/12$301
This Southwest deal was found by Cheapflights users on 8/10. 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 9/155:00 pm -
1 stop4h 10m
Wed 9/166:05 am -
1 stop6h 35m
Deal found 8/10$326
This Southwest deal was found by Cheapflights users on 8/10. 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 8/255:30 am -
1 stop4h 45m
Fri 8/286:10 am -
1 stop3h 50m
Deal found 8/10$405
This Southwest deal was found by Cheapflights users on 8/12. 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.
Sun 10/43:35 pm -
2 stops8h 00m
Tue 10/612:50 pm -
2 stops8h 45m
Deal found 8/12$408
This Southwest deal was found by Cheapflights users on 8/10. 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.
Mon 8/2411:50 am -
1 stop4h 35m
Fri 8/286:10 am -
1 stop3h 50m
Deal found 8/10$436

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 August 14, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$301
(Southwest)

One-way from

$239
(Kiwi.com)

Popular in

June

Cheapest in

July

Average price

$319
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
One-way flight from Louisville Intl to Islip Long Island
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($10 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 August 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 August 14, 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

LouisvilleIslip

SDF Louisville Intl - ISP Islip Long Island

SDFISP

Louisville Intl

Tue 9/15

5:00 pm-9:10 pm

1 stop4h 10m

Islip Long Island

Wed 9/16

6:05 am-12:40 pm

1 stop6h 35m

$326

LouisvilleIslip

SDF Louisville Intl - ISP Islip Long Island

SDFISP

Louisville Intl

Sun 10/4

3:35 pm-11:35 pm

2 stops8h 00m

Islip Long Island

Tue 10/6

12:50 pm-9:35 pm

2 stops8h 45m

$408

LouisvilleIslip

SDF Louisville Intl - ISP Islip Long Island

SDFISP

Louisville Intl

Tue 8/25

5:30 am-12:10 pm

1 stop6h 40m

Islip Long Island

Fri 8/28

12:35 pm-8:30 pm

2 stops7h 55m

$410
Quickest round-trip

LouisvilleIslip

SDF Louisville Intl - ISP Islip Long Island

SDFISP

Louisville Intl

Mon 8/24

11:50 am-4:25 pm

1 stop4h 35m

Islip Long Island

Fri 8/28

6:10 am-10:00 am

1 stop3h 50m

$436

LouisvilleIslip

SDF Louisville Intl - ISP Islip Long Island

SDFISP

Louisville Intl

Thu 8/27

8:30 am-12:35 pm

1 stop4h 05m

Islip Long Island

Mon 8/31

1:15 pm-9:55 pm

2 stops8h 40m

$441
Cheapest one-way

LouisvilleIslip

SDF Louisville Intl - ISP Islip Long Island

SDFISP

Louisville Intl

Thu 8/27

6:55 pm-1:28 pm

2 stops18h 33m

$239
Quickest one-way

LouisvilleIslip

SDF Louisville Intl - ISP Islip Long Island

SDFISP

Louisville Intl

Thu 8/27

5:19 pm-9:53 am

1 stop16h 34m

$263

LouisvilleIslip

SDF Louisville Intl - ISP Islip Long Island

SDFISP

Louisville Intl

Fri 8/21

8:28 pm-1:33 pm

1 stop17h 05m

$420

LouisvilleIslip

SDF Louisville Intl - ISP Islip Long Island

SDFISP

Louisville Intl

Sun 8/23

6:55 pm-11:16 am

3 stops40h 21m

$466

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/13

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 August.
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.

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 7h 55m. Southwest provides one of the quickest options available for as low as $332. There are 697 mi between Louisville and Islip, New York.

  • 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.

See more FAQs

Traveling to a place near Islip?

Book flights to Islip if you plan to visit one of these locations
Riverhead

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.

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.