How far is Decatur, IL, from Springfield, IL?

The distance between Springfield (Springfield Abraham Lincoln Capital Airport) and Decatur (Decatur Airport) is 43 miles / 70 kilometers / 38 nautical miles.

The driving distance from Springfield (SPI) to Decatur (DEC) is 45 miles / 73 kilometers, and travel time by car is about 1 hour 3 minutes.

Distance from Springfield to Decatur

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

Vincenty's formula (applied above)

• 43.202 miles
• 69.527 kilometers
• 37.542 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

• 43.095 miles
• 69.354 kilometers
• 37.448 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 Springfield to Decatur?

The estimated flight time from Springfield Abraham Lincoln Capital Airport to Decatur Airport is 34 minutes.

What is the time difference between Springfield and Decatur?

There is no time difference between Springfield and Decatur.

Flight carbon footprint between Springfield Abraham Lincoln Capital Airport (SPI) and Decatur Airport (DEC)

On average, flying from Springfield to Decatur generates about 31 kg of CO2 per passenger, and 31 kilograms equals 69 pounds (lbs). The figures are estimates and include only the CO2 generated by burning jet fuel.

Map of flight path and driving directions from Springfield to Decatur

See the map of the shortest flight path between Springfield Abraham Lincoln Capital Airport (SPI) and Decatur Airport (DEC).

Airport information

Origin	Springfield Abraham Lincoln Capital Airport
City:	Springfield, IL
Country:	United States
IATA Code:	SPI
ICAO Code:	KSPI
Coordinates:	39°50′38″N, 89°40′40″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