Air Miles Calculator

Distance between Green Bay, WI (GRB) and Rockford, IL (RFD)

Distance from Green Bay–Austin Straubel International Airport to Chicago Rockford International Airport is 165 miles / 266 kilometers / 144 nautical miles.

Calculations with different methods

Vincenty's formula (applied above)
  • 165.411 miles
  • 266.204 kilometers
  • 143.739 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
  • 165.503 miles
  • 266.351 kilometers
  • 143.818 nautical miles

The haversine formula calculates the distance between latitude/longitude points assuming a spherical earth (great-circle distance).

Flight duration

Estimated flight time from Green Bay–Austin Straubel International Airport (GRB) to Chicago Rockford International Airport (RFD) is 48 minutes.

Time difference and current local times

There is no time difference between Green Bay and Rockford.

Time Difference

Green Bay
Rockford

Green Bay, WI

 CDT

Rockford, IL

 CDT

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 Chicago Rockford International Airport
City: Rockford, IL
Country: United States Flag of United States
IATA Code: RFD
ICAO Code: KRFD
Coordinates: 42°11′43″N, 89°5′49″W

Map

Flight map from Green Bay to Rockford.

Frequent Flyer Miles Calculator

Green Bay (GRB) → Rockford (RFD).

Elite level bonus (%):
Booking class bonus (%):
Air miles:
165
Elite level bonus:
0
Booking class bonus:
0

In total

Total frequent flyer miles:
165

Round trip?