How far is Helena from Chicago?
There are several ways to calculate distances between Chicago and Helena. Here are two common methods:Vincenty's formula (applied above)
- 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 – the shortest distance between two points).
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.
Carbon dioxide emissions
Estimated CO2 emissions per passenger is 163 kg (359 pounds).
Chicago to Helena flight map.
Frequent Flyer Miles Calculator
Chicago (ORD) → Helena (HLN).