How long is the flight from Louisville to Islip, New York?

A quick flight from Louisville to Islip, New York can take about 6h. Southwest provides one of the quickest options available for as low as $304. 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. You may be able to fly from Louisville to Islip, New York for 18% less than the average price by searching for this airline.

In terms of precipitation, rainfall in Islip, New York ranges from 3.3 - 4.4 inches per month. March is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Islip, New York when rainfall is around 3.3 in.

If weather is an important factor for your trip to Islip, New York, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

What is the cheapest time of day to fly from SDF to ISP?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Louisville to Islip, New York as you normally would.

Most accurate provider : When it comes to deals on Louisville-Islip, New York flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Louisville-Islip, New York flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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.

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.

$304+ Flights from Louisville to Islip, NY

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1. Tell us where you want to go

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2. Select your favorite providers

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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 December 15, 2025.

Mon 12/296:41 pmSDF - ISP

1 stop23h 14mMultiple Airlines

Fri 1/22:04 pmISP - SDF

2 stops9h 55mMultiple Airlines

Deal found 12/13

$735

Mon 12/298:52 pmSDF - ISP

2 stops13h 06mBreeze Airways

Fri 1/28:47 pmISP - SDF

3 stops41h 28mBreeze Airways

Deal found 12/13

$1,108

Best flights from Louisville to Islip
Discover carefully curated flight deals from Louisville to Islip that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 15, 2025.

Sat 2/75:45 amSDF - ISP

1 stop6h 00mSouthwest

Sun 2/83:45 pmISP - SDF

1 stop7h 00mSouthwest

Deal found 12/14

$304

Mon 12/296:41 pmSDF - ISP

1 stop23h 14mMultiple Airlines

Fri 1/22:04 pmISP - SDF

2 stops9h 55mMultiple Airlines

Deal found 12/13

$735

Mon 12/298:52 pmSDF - ISP

2 stops13h 06mBreeze Airways

Fri 1/28:47 pmISP - SDF

3 stops41h 28mBreeze Airways

Deal found 12/13

$1,108

Last-minute flights from Louisville to Islip
Discover last-minute flight deals from Louisville to Islip. Data last updated December 15, 2025 and is based on user searches.

Mon 12/296:41 pmSDF - ISP

1 stop23h 14mMultiple Airlines

Fri 1/22:04 pmISP - SDF

2 stops9h 55mMultiple Airlines

Deal found 12/13

$735

Mon 12/298:52 pmSDF - ISP

2 stops13h 06mBreeze Airways

Fri 1/28:47 pmISP - SDF

3 stops41h 28mBreeze Airways

Deal found 12/13

$1,108

Find flight deals from Louisville to Islip

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$304 (Southwest)
Popular in	February
Cheapest in	August
Average price	$383

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 December 2025

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Sat 2/7

5:45 am-11:45 am

1 stop6h 00m

Islip Long Island

Sun 2/8

3:45 pm-10:45 pm

1 stop7h 00m

$304

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Mon 12/29

6:41 pm-5:55 pm

1 stop23h 14m

Islip Long Island

Fri 1/2

2:04 pm-11:59 pm

2 stops9h 55m

$735

LouisvilleIslip

SDF - ISP

SDFISP

Louisville Intl

Mon 12/29

8:52 pm-9:58 am

2 stops13h 06m

Islip Long Island

Fri 1/2

8:47 pm-2:15 pm

3 stops41h 28m

$1,108

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/14

Compare providers for flights from Louisville to Islip

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Louisville to Islip in December.

Provider	Price Accuracy	Trust Score*
FlightHub	Price Accuracy3 stars	Trust Score*1 star
Expedia	Price Accuracy2 stars	Trust Score*3 stars
eDreams	Price Accuracy3 stars	Trust 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Louisville-Islip, New York flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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 $71). Flying from Louisville to Islip, New York in February is currently the most expensive (average of $128). 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 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

7.9

Good

4,250 reviews

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

7.9

Good

4,250 reviews

Southwest

7.9

Good

4,250 reviews

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

How long is the flight from Louisville to Islip, New York?
A quick flight from Louisville to Islip, New York can take about 6h. Southwest provides one of the quickest options available for as low as $304. 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. 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, April 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 February is currently the most expensive (average of $128). 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

Riverhead

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Top airline flying from Louisville to Islip

Airline	Cheapest	Average	Flexibility	On-time
Southwest	Cheapest$276	Average$322	FlexibilityNo cancel fee	On-time63%

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$304+ 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 2/7. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Louisville to Islip with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Louisville to Islip

Cheapest flights from Louisville to IslipExplore 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 December 15, 2025.

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 December 15, 2025.

Find flight deals from Louisville to Islip

Most accurate provider

Most trusted provider

Round-trip from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

Use the filters below to find and compare flights from Louisville to Islip that are best for you.

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 December.

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.

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?

Reviews of airlines servicing Islip

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.

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?

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

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

How can I find direct flights from Louisville to Islip?

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

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

Traveling to a place near Islip?

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Alternative routes for Louisville to Islip

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Top airline flying from Louisville to Islip

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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 December 15, 2025.