Air Miles Calculator

Distance between Atlanta, GA (ATL) and Decatur, IL (DEC)

Flight distance from Atlanta to Decatur (Hartsfield–Jackson Atlanta International Airport – Decatur Airport) is 493 miles / 794 kilometers / 428 nautical miles. Estimated flight time is 1 hour 26 minutes.

Driving distance from Atlanta (ATL) to Decatur (DEC) is 625 miles / 1006 kilometers and travel time by car is about 11 hours 16 minutes.

Map of flight path and driving directions from Atlanta to Decatur.

Shortest flight path between Hartsfield–Jackson Atlanta International Airport (ATL) and Decatur Airport (DEC).

How far is Decatur from Atlanta?

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

Vincenty's formula (applied above)
  • 493.093 miles
  • 793.557 kilometers
  • 428.486 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
  • 493.552 miles
  • 794.294 kilometers
  • 428.885 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 Hartsfield–Jackson Atlanta International Airport
City: Atlanta, GA
Country: United States Flag of United States
IATA Code: ATL
ICAO Code: KATL
Coordinates: 33°38′12″N, 84°25′41″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

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

Time Difference

Atlanta, GA

 EDT

Decatur, IL

 CDT

Carbon dioxide emissions

Estimated CO2 emissions per passenger is 98 kg (216 pounds).

Frequent Flyer Miles Calculator

Atlanta (ATL) → Decatur (DEC).

Distance:
493
Elite level bonus:
0
Booking class bonus:
0

In total

Total frequent flyer miles:
493

Round trip?