Map of flight path and driving directions from St Louis to Helena.
Shortest flight path between St. Louis Lambert International Airport (STL) and Helena Regional Airport (HLN).
How far is Helena from St Louis?
There are several ways to calculate distances between St Louis and Helena. Here are two common methods:Vincenty's formula (applied above)
- 1221.688 miles
- 1966.116 kilometers
- 1061.618 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
- 1219.324 miles
- 1962.313 kilometers
- 1059.564 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 St Louis and Helena is 1 hour. Helena is 1 hour behind St Louis.
St Louis, MO
Carbon dioxide emissions
Estimated CO2 emissions per passenger is 162 kg (358 pounds).
Frequent Flyer Miles Calculator
St Louis (STL) → Helena (HLN).