How far is Islip, NY, from Decatur, IL?

The distance between Decatur (Decatur Airport) and Islip (Long Island MacArthur Airport) is 834 miles / 1342 kilometers / 725 nautical miles.

The driving distance from Decatur (DEC) to Islip (ISP) is 963 miles / 1549 kilometers, and travel time by car is about 18 hours 5 minutes.

Distance from Decatur to Islip

There are several ways to calculate the distance from Decatur to Islip. Here are two standard methods:

Vincenty's formula (applied above)

• 834.185 miles
• 1342.490 kilometers
• 724.887 nautical miles

Vincenty's formula calculates the distance between latitude/longitude points on the earth's surface using an ellipsoidal model of the planet.

Haversine formula

• 832.105 miles
• 1339.143 kilometers
• 723.079 nautical miles

The haversine formula calculates the distance between latitude/longitude points assuming a spherical earth (great-circle distance – the shortest distance between two points).

How long does it take to fly from Decatur to Islip?

The estimated flight time from Decatur Airport to Long Island MacArthur Airport is 2 hours and 4 minutes.

What is the time difference between Decatur and Islip?

The time difference between Decatur and Islip is 1 hour. Islip is 1 hour ahead of Decatur.

Flight carbon footprint between Decatur Airport (DEC) and Long Island MacArthur Airport (ISP)

On average, flying from Decatur to Islip generates about 138 kg of CO2 per passenger, and 138 kilograms equals 304 pounds (lbs). The figures are estimates and include only the CO2 generated by burning jet fuel.

Map of flight path and driving directions from Decatur to Islip

See the map of the shortest flight path between Decatur Airport (DEC) and Long Island MacArthur Airport (ISP).

Airport information

Origin	Decatur Airport
City:	Decatur, IL
Country:	United States
IATA Code:	DEC
ICAO Code:	KDEC
Coordinates:	39°50′4″N, 88°51′56″W

Destination	Long Island MacArthur Airport
City:	Islip, NY
Country:	United States
IATA Code:	ISP
ICAO Code:	KISP
Coordinates:	40°47′42″N, 73°6′0″W