Search by airport name, city or IATA airport code.
Chicago–Great Falls | ORD–GTF
Calculations with different methods
- 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).
Estimated flight time from O'Hare International Airport (ORD) to Great Falls International Airport (GTF) is 2 hours 47 minutes.
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
Chicago to Great Falls flight map.
Frequent Flyer Miles Calculator
Chicago (ORD) → Great Falls (GTF).