HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Islip

$119+ Cheap flights from Louisville to Islip (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 10/1. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — ISP
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
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

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 September 11, 2025.

Round-trip from

$271
(KAYAK)

One-way from

$119
(Kiwi.com)

Popular in

October

Cheapest in

August

Average price

$361
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. 10% potential increase in price ($42 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find 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 September 11, 2025.

This KAYAK deal was found by Cheapflights users on 9/11. 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.
Wed 10/223:50 pmSDF - ISP
1 stop6h 15mSouthwest
Thu 10/235:35 pmISP - SDF
1 stop6h 35mSouthwest
Deal found 9/11$271
This Kiwi.com deal was found by Cheapflights users on 9/11. 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.
Fri 9/2610:14 amSDF - ISP
1 stop24h 41mMultiple Airlines
Tue 9/3011:25 amISP - SDF
1 stop21h 54mMultiple Airlines
Deal found 9/11$398

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 September 11, 2025.
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

Wed 10/22

3:50 pm-10:05 pm

1 stop6h 15m

Islip Long Island

Thu 10/23

5:35 pm-12:10 am

1 stop6h 35m

$271

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Fri 9/26

10:14 am-10:55 am

1 stop24h 41m

Islip Long Island

Tue 9/30

11:25 am-9:19 am

1 stop21h 54m

$398

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Wed 10/1

10:14 am-10:55 am

1 stop24h 41m

$119

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Fri 10/10

7:15 am-10:37 am

1 stop27h 22m

$131

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Thu 10/2

10:14 am-10:40 am

1 stop24h 26m

$161

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Mon 10/6

8:10 pm-10:57 am

3 stops38h 47m

$193

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Sat 10/4

8:23 am-10:40 am

3 stops50h 17m

$234

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Sat 10/4

11:50 am-4:15 pm

1 stop4h 25m

$235

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Sun 10/5

2:55 pm-1:45 pm

1 stop22h 50m

$334

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Tue 11/25

11:10 am-5:23 pm

1 stop6h 13m

$431

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

Showing 1-10 of 11 results
1
2

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?

Currently, January is the cheapest month in which you can book a flight from Louisville to Islip (average of $108). Flying from Louisville to Islip in November is currently the most expensive (average of $213). 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.

How much does it cost to fly round-trip from Louisville to Islip?

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 September 11, 2025.
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
4,248 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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?

    Southwest can get you from Louisville to Islip in just under 6h 15m. Your travel time can differ by up to . There are 697 mi between Louisville and Islip.

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

    According to our current data, Southwest ($276), offers the cheapest pricing from Louisville to Islip. Southwest is priced at 22% lower than the current average price of a flight leaving 3 months from now.

  • 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?

    Currently, January is the cheapest month in which you can book a flight from Louisville to Islip (average of $108). Flying from Louisville to Islip in November is currently the most expensive (average of $213). 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
Southampton

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.

Alternative routes for Louisville to Islip

See prices for flight routes from nearby airports that may be better suited for you.
Cincinnati to John F Kennedy Intl flights
Cincinnati to LaGuardia flights
Nashville to LaGuardia flights
Nashville to John F Kennedy Intl flights
Cincinnati to Newark flights
Nashville to Newark flights
Louisville to LaGuardia flights
Louisville to Newark flights
Louisville to John F Kennedy Intl flights
Knoxville to LaGuardia flights
Knoxville to John F Kennedy Intl flights
Lexington to LaGuardia flights
Lexington to John F Kennedy Intl flights
Lexington to Newark flights
Cincinnati to Albany flights
Knoxville to Newark flights
Nashville to Buffalo flights
Knoxville to Albany flights
Knoxville to Buffalo flights
Nashville to Stewart flights
Nashville to Albany flights
Cincinnati to Stewart flights
Cincinnati to Buffalo flights
Cincinnati to White Plains flights
Cincinnati to Syracuse flights
Lexington to Albany flights
Louisville to Buffalo flights
Nashville to Syracuse flights
Louisville to Albany flights
Nashville to White Plains flights
Cincinnati to Islip flights
Louisville to White Plains flights
Nashville to Rochester flights
Blountville to John F Kennedy Intl flights
Knoxville to Rochester flights
Blountville to Newark flights
Blountville to LaGuardia flights
Knoxville to Syracuse flights
Blountville to Albany flights
Knoxville to White Plains flights
Cincinnati to Rochester flights
Evansville to John F Kennedy Intl flights
Evansville to LaGuardia flights
Louisville to Stewart flights
Evansville to Newark flights
Knoxville to Stewart flights
Lexington to Syracuse flights
Louisville to Elmira flights
Huntington to John F Kennedy Intl flights
Louisville to Syracuse flights

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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
SouthwestCheapest$276Average$322FlexibilityNo cancel feeOn-time63%

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.