Map of flight path and driving directions from Chicago to Great Falls.
Shortest flight path between Chicago O'Hare International Airport (ORD) and Great Falls International Airport (GTF).
How far is Great Falls from Chicago?
There are several ways to calculate distances between Chicago and Great Falls. Here are two common methods:Vincenty's formula (applied above)
- 1210.473 miles
- 1948.067 kilometers
- 1051.872 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
- 1207.522 miles
- 1943.318 kilometers
- 1049.308 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).
Time difference and current local times
The time difference between Chicago and Great Falls is 1 hour. Great Falls is 1 hour behind Chicago.
Great Falls, MT
Carbon dioxide emissions
Estimated CO2 emissions per passenger is 162 kg (357 pounds).
Frequent Flyer Miles Calculator
Chicago (ORD) → Great Falls (GTF).