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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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?
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  |
| 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 |
| IATA Code: | RFD |
| ICAO Code: | KRFD |
| Coordinates: | 42°11′43″N, 89°5′49″W |