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How far is Rockford, IL, from Decatur, IL?

The distance between Decatur (Decatur Airport) and Rockford (Chicago Rockford International Airport) is 163 miles / 263 kilometers / 142 nautical miles.

The driving distance from Decatur (DEC) to Rockford (RFD) is 185 miles / 297 kilometers, and travel time by car is about 3 hours 34 minutes.

Decatur Airport – Chicago Rockford International Airport

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163
Miles
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263
Kilometers
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142
Nautical miles

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Distance from Decatur to Rockford

There are several ways to calculate the distance from Decatur to Rockford. Here are two standard methods:

Vincenty's formula (applied above)
  • 163.358 miles
  • 262.899 kilometers
  • 141.954 nautical miles

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

Haversine formula
  • 163.562 miles
  • 263.227 kilometers
  • 142.131 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).

How long does it take to fly from Decatur to Rockford?

The estimated flight time from Decatur Airport to Chicago Rockford International Airport is 48 minutes.

What is the time difference between Decatur and Rockford?

There is no time difference between Decatur and Rockford.

Flight carbon footprint between Decatur Airport (DEC) and Chicago Rockford International Airport (RFD)

On average, flying from Decatur to Rockford generates about 49 kg of CO2 per passenger, and 49 kilograms equals 108 pounds (lbs). The figures are estimates and include only the CO2 generated by burning jet fuel.

Map of flight path and driving directions from Decatur to Rockford

See the map of the shortest flight path between Decatur Airport (DEC) and Chicago Rockford International Airport (RFD).

Airport information

Origin 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
Destination 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