How far is Rockford, IL, from Great Falls, MT?
The distance between Great Falls (Great Falls International Airport) and Rockford (Chicago Rockford International Airport) is 1149 miles / 1849 kilometers / 998 nautical miles.
The driving distance from Great Falls (GTF) to Rockford (RFD) is 1319 miles / 2122 kilometers, and travel time by car is about 23 hours 55 minutes.
Great Falls International Airport – Chicago Rockford International Airport
Search flights
Distance from Great Falls to Rockford
There are several ways to calculate the distance from Great Falls to Rockford. Here are two standard methods:
Vincenty's formula (applied above)- 1148.865 miles
- 1848.919 kilometers
- 998.337 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- 1146.065 miles
- 1844.413 kilometers
- 995.903 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 Great Falls to Rockford?
The estimated flight time from Great Falls International Airport to Chicago Rockford International Airport is 2 hours and 40 minutes.
What is the time difference between Great Falls and Rockford?
Flight carbon footprint between Great Falls International Airport (GTF) and Chicago Rockford International Airport (RFD)
On average, flying from Great Falls to Rockford generates about 159 kg of CO2 per passenger, and 159 kilograms equals 351 pounds (lbs). The figures are estimates and include only the CO2 generated by burning jet fuel.
Map of flight path and driving directions from Great Falls to Rockford
See the map of the shortest flight path between Great Falls International Airport (GTF) and Chicago Rockford International Airport (RFD).
Airport information
| Origin | Great Falls International Airport |
|---|---|
| City: | Great Falls, MT |
| Country: | United States  |
| IATA Code: | GTF |
| ICAO Code: | KGTF |
| Coordinates: | 47°28′55″N, 111°22′15″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 |