Air Miles Calculator

Distance between Green Bay, WI (GRB) and Decatur, IL (DEC)

Flight distance from Green Bay to Decatur (Green Bay–Austin Straubel International Airport – Decatur Airport) is 323 miles / 520 kilometers / 281 nautical miles. Estimated flight time is 1 hour 6 minutes.

Driving distance from Green Bay (GRB) to Decatur (DEC) is 365 miles / 587 kilometers and travel time by car is about 6 hours 41 minutes.

Map of flight path and driving directions from Green Bay to Decatur.

Shortest flight path between Green Bay–Austin Straubel International Airport (GRB) and Decatur Airport (DEC).

How far is Decatur from Green Bay?

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

Vincenty's formula (applied above)
  • 323.190 miles
  • 520.124 kilometers
  • 280.845 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
  • 323.519 miles
  • 520.653 kilometers
  • 281.130 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 Green Bay–Austin Straubel International Airport
City: Green Bay, WI
Country: United States Flag of United States
IATA Code: GRB
ICAO Code: KGRB
Coordinates: 44°29′6″N, 88°7′46″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 Green Bay and Decatur.

Time Difference

Green Bay, WI

 CDT

Decatur, IL

 CDT

Carbon dioxide emissions

Estimated CO2 emissions per passenger is 73 kg (160 pounds).

Frequent Flyer Miles Calculator

Green Bay (GRB) → Decatur (DEC).

Distance:
323
Elite level bonus:
0
Booking class bonus:
0

In total

Total frequent flyer miles:
323

Round trip?