Map of flight path and driving directions from Chicago to Helena.
Shortest flight path between Chicago O'Hare International Airport (ORD) and Helena Regional Airport (HLN).
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).
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).
Frequent Flyer Miles Calculator
Chicago (ORD) → Helena (HLN).