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

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

The driving distance from Islip (ISP) to Decatur (DEC) is 961 miles / 1546 kilometers, and travel time by car is about 18 hours 7 minutes.

Distance from Islip to Decatur

There are several ways to calculate the distance from Islip to Decatur. 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 Islip to Decatur?

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

What is the time difference between Islip and Decatur?

The time difference between Islip and Decatur is 1 hour. Decatur is 1 hour behind Islip.

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

On average, flying from Islip to Decatur 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 Islip to Decatur

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

Airport information

Origin	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

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