Air Miles Calculator

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

Flight distance from St Louis to Helena (St. Louis Lambert International Airport – Helena Regional Airport) is 1222 miles / 1966 kilometers / 1062 nautical miles. Estimated flight time is 2 hours 48 minutes.

Driving distance from St Louis (STL) to Helena (HLN) is 1548 miles / 2491 kilometers and travel time by car is about 25 hours 21 minutes.

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).

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

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, MO

 CST

Helena, MT

 MST

Carbon dioxide emissions

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

Frequent Flyer Miles Calculator

St Louis (STL) → Helena (HLN).

Distance:
1222
Elite level bonus:
0
Booking class bonus:
0

In total

Total frequent flyer miles:
1222

Round trip?