How far is Helena, MT, from Decatur, IL?

The distance between Decatur (Decatur Airport) and Helena (Helena Regional Airport) is 1251 miles / 2014 kilometers / 1087 nautical miles.

The driving distance from Decatur (DEC) to Helena (HLN) is 1532 miles / 2465 kilometers, and travel time by car is about 27 hours 22 minutes.

Distance from Decatur to Helena

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

Vincenty's formula (applied above)

• 1251.454 miles
• 2014.021 kilometers
• 1087.484 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

• 1248.720 miles
• 2009.620 kilometers
• 1085.108 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 Helena?

The estimated flight time from Decatur Airport to Helena Regional Airport is 2 hours and 52 minutes.

What is the time difference between Decatur and Helena?

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

Flight carbon footprint between Decatur Airport (DEC) and Helena Regional Airport (HLN)

On average, flying from Decatur to Helena generates about 164 kg of CO2 per passenger, and 164 kilograms equals 361 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 Helena

See the map of the shortest flight path between Decatur Airport (DEC) and Helena Regional Airport (HLN).

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	Helena Regional Airport
City:	Helena, MT
Country:	United States
IATA Code:	HLN
ICAO Code:	KHLN
Coordinates:	46°36′24″N, 111°58′58″W