Map of flight path and driving directions from Chicago to Decatur.
Shortest flight path between Chicago O'Hare International Airport (ORD) and Decatur Airport (DEC).
How far is Decatur from Chicago?
There are several ways to calculate distances between Chicago and Decatur. Here are two common methods:Vincenty's formula (applied above)
- 156.262 miles
- 251.479 kilometers
- 135.788 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
- 156.401 miles
- 251.703 kilometers
- 135.908 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).
Time difference and current local times
There is no time difference between Chicago and Decatur.
Carbon dioxide emissions
Estimated CO2 emissions per passenger is 48 kg (106 pounds).
Frequent Flyer Miles Calculator
Chicago (ORD) → Decatur (DEC).