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

Southwest, at $271, was found to be the cheapest airline from Islip, New York to Indianapolis..

In terms of precipitation, rainfall in Indianapolis ranges from 2.3 - 5.1 inches per month. May is typically the wettest month, when rainfall can reach 5.1 in. February is typically the driest time to visit Indianapolis when rainfall is around 2.3 in.

If weather is an important factor for your trip to Indianapolis, 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 75.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 28.4 F).

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

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

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

Most trusted provider : When it comes to deals on Islip, New York-Indianapolis 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 Islip, New York-Indianapolis 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 Islip to Indianapolis that include hotel bookings?

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

How can I find direct flights from Islip to Indianapolis?

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

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

Yes. Cheapflights offers flight deals from Islip to Indianapolis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$355+ Flights from Islip, NY to Indianapolis

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Cheap flight deals from Islip to Indianapolis

Cheapest flights from Islip to Indianapolis
Explore the most affordable flight options available from Islip to Indianapolis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 16, 2025.

Sun 12/288:35 pmISP - IND

1 stop27h 03mMultiple Airlines

Fri 1/95:34 pmIND - ISP

1 stop25h 34mMultiple Airlines

Deal found 12/16

$355

Fri 12/264:40 pmISP - IND

1 stop18h 53mMultiple Airlines

Fri 1/95:34 pmIND - ISP

1 stop25h 34mMultiple Airlines

Deal found 12/16

$456

Mon 12/226:00 pmISP - IND

1 stop6h 35mSouthwest

Mon 12/295:20 amIND - ISP

1 stop6h 35mSouthwest

Deal found 12/14

$512

Sun 12/285:40 amISP - IND

2 stops6h 10mSouthwest

Wed 12/316:15 amIND - ISP

2 stops8h 50mSouthwest

Deal found 12/15

$522

Mon 12/298:35 pmISP - IND

1 stop19h 36mMultiple Airlines

Fri 1/25:15 amIND - ISP

1 stop7h 54mMultiple Airlines

Deal found 12/14

$534

Fri 12/264:40 pmISP - IND

1 stop18h 53mMultiple Airlines

Tue 1/2012:21 pmIND - ISP

2 stops31h 24mMultiple Airlines

Deal found 12/16

$741

Best flights from Islip to Indianapolis
Discover carefully curated flight deals from Islip to Indianapolis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 16, 2025.

Sun 12/288:35 pmISP - IND

1 stop27h 03mMultiple Airlines

Fri 1/95:34 pmIND - ISP

1 stop25h 34mMultiple Airlines

Deal found 12/16

$355

Sun 12/285:40 amISP - IND

1 stop4h 25mSouthwest

Wed 12/316:15 amIND - ISP

1 stop6h 15mSouthwest

Deal found 12/15

$512

Tue 1/138:00 amISP - IND

1 stop10h 23mMultiple Airlines

Tue 1/2012:21 pmIND - ISP

2 stops51h 49mMultiple Airlines

Deal found 12/16

$445

Fri 12/264:40 pmISP - IND

1 stop18h 53mMultiple Airlines

Fri 1/95:34 pmIND - ISP

1 stop25h 34mMultiple Airlines

Deal found 12/16

$456

Mon 12/298:35 pmISP - IND

1 stop19h 36mMultiple Airlines

Fri 1/25:15 amIND - ISP

1 stop7h 54mMultiple Airlines

Deal found 12/14

$534

Fri 12/264:40 pmISP - IND

1 stop18h 53mMultiple Airlines

Tue 1/2012:21 pmIND - ISP

2 stops31h 24mMultiple Airlines

Deal found 12/16

$741

Last-minute flights from Islip to Indianapolis
Discover last-minute flight deals from Islip to Indianapolis. Data last updated December 16, 2025 and is based on user searches.

Mon 12/226:00 pmISP - IND

1 stop6h 35mSouthwest

Mon 12/295:20 amIND - ISP

1 stop6h 35mSouthwest

Deal found 12/14

$512

Fri 12/264:40 pmISP - IND

1 stop18h 53mMultiple Airlines

Fri 1/95:34 pmIND - ISP

1 stop25h 34mMultiple Airlines

Deal found 12/16

$456

Fri 12/264:40 pmISP - IND

1 stop18h 53mMultiple Airlines

Tue 1/2012:21 pmIND - ISP

2 stops31h 24mMultiple Airlines

Deal found 12/16

$741

Sun 12/288:35 pmISP - IND

1 stop27h 03mMultiple Airlines

Fri 1/95:34 pmIND - ISP

1 stop25h 34mMultiple Airlines

Deal found 12/16

$355

Sun 12/285:40 amISP - IND

2 stops6h 10mSouthwest

Wed 12/316:15 amIND - ISP

2 stops8h 50mSouthwest

Deal found 12/15

$522

Mon 12/298:35 pmISP - IND

1 stop19h 36mMultiple Airlines

Fri 1/25:15 amIND - ISP

1 stop7h 54mMultiple Airlines

Deal found 12/14

$534

Tue 1/138:00 amISP - IND

1 stop10h 23mMultiple Airlines

Tue 1/2012:21 pmIND - ISP

2 stops51h 49mMultiple Airlines

Deal found 12/16

$445

Find flight deals from Islip to Indianapolis

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$355 (Kiwi.com)
Popular in	October
Cheapest in	February
Average price	$299

Provider with most accurate pricing for Islip Long Island-Indianapolis flight deals.

Search Deals

Provider most trusted by Cheapflights users for Islip Long Island-Indianapolis flights.

Search Deals

From Islip Long Island to Indianapolis

Search Deals

Highest demand for flights based on searches. 5% potential increase in price ($15 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

IslipIndianapolis

ISP - IND

ISPIND

Islip Long Island

Sun 12/28

8:35 pm-11:38 pm

1 stop27h 03m

Indianapolis

Fri 1/9

5:34 pm-7:08 pm

1 stop25h 34m

$355

IslipIndianapolis

ISP - IND

ISPIND

Islip Long Island

Tue 1/13

8:00 am-6:23 pm

1 stop10h 23m

Indianapolis

Tue 1/20

12:21 pm-4:10 pm

2 stops51h 49m

$445

IslipIndianapolis

ISP - IND

ISPIND

Islip Long Island

Fri 12/26

4:40 pm-11:33 am

1 stop18h 53m

Indianapolis

Fri 1/9

5:34 pm-7:08 pm

1 stop25h 34m

$456

IslipIndianapolis

ISP - IND

ISPIND

Islip Long Island

Sun 12/28

5:40 am-10:05 am

1 stop4h 25m

Indianapolis

Wed 12/31

6:15 am-12:30 pm

1 stop6h 15m

$512

IslipIndianapolis

ISP - IND

ISPIND

Islip Long Island

Mon 12/29

8:35 pm-4:11 pm

1 stop19h 36m

Indianapolis

Fri 1/2

5:15 am-1:09 pm

1 stop7h 54m

$534

IslipIndianapolis

ISP - IND

ISPIND

Islip Long Island

Fri 12/26

4:40 pm-11:33 am

1 stop18h 53m

Indianapolis

Tue 1/20

12:21 pm-7:45 pm

2 stops31h 24m

$741

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

Compare providers for flights from Islip to Indianapolis

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

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy2 stars	Trust Score*3 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*1 star

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

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

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

Currently, March is the cheapest month in which you can book a flight from Islip, New York to Indianapolis (average of $53). Flying from Islip, New York to Indianapolis in September is currently the most expensive (average of $95). 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 Indianapolis

See what other customers who have flown with Southwest from Islip to Indianapolis have to say. You can also see how each airline compares 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

What is the cheapest airline to fly from Islip, New York to Indianapolis round-trip?
Southwest, at $271, was found to be the cheapest airline from Islip, New York to Indianapolis..
Can I find deals for flights from Islip to Indianapolis that include hotel bookings?
Yes. In addition to deals on Islip to Indianapolis flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Islip to Indianapolis?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to Indianapolis.
Can I find deals for business class flights from Islip to Indianapolis?
Yes. Cheapflights offers flight deals from Islip to Indianapolis 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 Islip, New York to Indianapolis?
Currently, March is the cheapest month in which you can book a flight from Islip, New York to Indianapolis (average of $53). Flying from Islip, New York to Indianapolis in September is currently the most expensive (average of $95). 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

Terre Haute

Muncie

Noblesville

Fishers

Greenwood

Plainfield

Anderson

Kokomo

Franklin

Carmel

Crawfordsville

Bloomington

Speedway

Browse thousands of different options on Cheapflights for your next trip

Top airline flying from Islip to Indianapolis

Airline	Cheapest	Average	Flexibility	On-time
Southwest	Cheapest$271	Average$331	FlexibilityNo cancel fee	On-time63%

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$355+ Cheap flights from Islip, NY to Indianapolis (ISP - IND)

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 12/28. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Islip to Indianapolis with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Islip to Indianapolis

Cheapest flights from Islip to IndianapolisExplore the most affordable flight options available from Islip to Indianapolis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 16, 2025.

Explore the most affordable flight options available from Islip to Indianapolis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 16, 2025.

Find flight deals from Islip to Indianapolis

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 Islip to Indianapolis that are best for you.

Compare providers for flights from Islip to Indianapolis

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 Islip to Indianapolis in December.

Best time to book a flight from Islip to Indianapolis

Have a flexible travel schedule? Discover the best time to fly to Indianapolis from Islip with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Islip to Indianapolis

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

Reviews of airlines servicing Indianapolis

See what other customers who have flown with Southwest from Islip to Indianapolis have to say. You can also see how each airline compares 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 Islip to Indianapolis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

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

How can I find direct flights from Islip to Indianapolis?

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

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

Traveling to a place near Indianapolis?

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 Islip to Indianapolis

See prices for flight routes from nearby airports that may be better suited for you.

Top airline flying from Islip to Indianapolis

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Travel Smart

Cheapest flights from Islip to Indianapolis
Explore the most affordable flight options available from Islip to Indianapolis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 16, 2025.