Air Miles Calculator

Distance between St Louis, MO (STL) and Decatur, IL (DEC)

Flight distance from St Louis to Decatur (St. Louis Lambert International Airport – Decatur Airport) is 110 miles / 177 kilometers / 96 nautical miles. Estimated flight time is 42 minutes.

Driving distance from St Louis (STL) to Decatur (DEC) is 149 miles / 239 kilometers and travel time by car is about 2 hours 44 minutes.

Map of flight path and driving directions from St Louis to Decatur.

Shortest flight path between St. Louis Lambert International Airport (STL) and Decatur Airport (DEC).

How far is Decatur from St Louis?

There are several ways to calculate distances between St Louis and Decatur. Here are two common methods:

Vincenty's formula (applied above)
  • 110.062 miles
  • 177.127 kilometers
  • 95.641 nautical miles

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

Haversine formula
  • 109.996 miles
  • 177.022 kilometers
  • 95.584 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).

Airport information


A St. Louis Lambert International Airport
City: St Louis, MO
Country: United States Flag of United States
IATA Code: STL
ICAO Code: KSTL
Coordinates: 38°44′55″N, 90°22′12″W

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

Time difference and current local times

There is no time difference between St Louis and Decatur.

Time Difference

St Louis, MO

 CST

Decatur, IL

 CST

Carbon dioxide emissions

Estimated CO2 emissions per passenger is 41 kg (91 pounds).

Frequent Flyer Miles Calculator

St Louis (STL) → Decatur (DEC).

Distance:
110
Elite level bonus:
0
Booking class bonus:
0

In total

Total frequent flyer miles:
110

Round trip?