Air Miles Calculator

Distance between St Louis, MO (STL) and Helena, MT (HLN)

Distance from St Louis to Helena (St. Louis Lambert International Airport – Helena Regional Airport) is 1222 miles / 1966 kilometers / 1062 nautical miles.

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).

Flight duration

Estimated flight time from St. Louis Lambert International Airport (STL) to Helena Regional Airport (HLN) is 2 hours 48 minutes.

Time difference and current local times

The time difference between St Louis and Helena is 1 hour. Helena is 1 hour behind St Louis.

Time Difference

St Louis
Helena

St Louis, MO

 CST

Helena, MT

 MST

Carbon dioxide emissions

Estimated CO2 emissions per passenger is 162 kg (358 pounds).

Airport information


A St. Louis Lambert International Airport
City: St Louis, MO
Country: United States Flag of United States
IATA Code: STL
ICAO Code: KSTL
Coordinates: 38°44′55″N, 90°22′12″W

B Helena Regional Airport
City: Helena, MT
Country: United States Flag of United States
IATA Code: HLN
ICAO Code: KHLN
Coordinates: 46°36′24″N, 111°58′58″W

Map

St Louis to Helena flight map.

Frequent Flyer Miles Calculator

St Louis (STL) → Helena (HLN).

Elite level bonus (%):
Booking class bonus (%):
Air miles:
1222
Elite level bonus:
0
Booking class bonus:
0

In total

Total frequent flyer miles:
1222

Round trip?