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Chicago–Helena | ORD–HLN
Calculations with different methods
- 1230.723 miles
- 1980.656 kilometers
- 1069.469 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
- 1227.627 miles
- 1975.675 kilometers
- 1066.779 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 Helena Regional Airport (HLN) is 2 hours 49 minutes.
Time difference and current local times
The time difference between Chicago and Helena is 1 hour. Helena is 1 hour behind Chicago.
Chicago to Helena flight map.
Frequent Flyer Miles Calculator
Chicago (ORD) → Helena (HLN).