How far is Decatur, IL, from Rockford, IL?
The distance between Rockford (Chicago Rockford International Airport) and Decatur (Decatur Airport) is 163 miles / 263 kilometers / 142 nautical miles.
The driving distance from Rockford (RFD) to Decatur (DEC) is 181 miles / 292 kilometers, and travel time by car is about 3 hours 31 minutes.
Chicago Rockford International Airport – Decatur Airport
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Distance from Rockford to Decatur
There are several ways to calculate the distance from Rockford to Decatur. 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 Rockford to Decatur?
The estimated flight time from Chicago Rockford International Airport to Decatur Airport is 48 minutes.
What is the time difference between Rockford and Decatur?
Flight carbon footprint between Chicago Rockford International Airport (RFD) and Decatur Airport (DEC)
On average, flying from Rockford to Decatur 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 Rockford to Decatur
See the map of the shortest flight path between Chicago Rockford International Airport (RFD) and Decatur Airport (DEC).
Airport information
| Origin | Chicago Rockford International Airport |
|---|---|
| City: | Rockford, IL |
| Country: | United States  |
| IATA Code: | RFD |
| ICAO Code: | KRFD |
| Coordinates: | 42°11′43″N, 89°5′49″W |
| Destination | Decatur Airport |
|---|---|
| City: | Decatur, IL |
| Country: | United States |
| IATA Code: | DEC |
| ICAO Code: | KDEC |
| Coordinates: | 39°50′4″N, 88°51′56″W |