# 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
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
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.

CDT

MDT

## 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?