How far is Helena, MT, from St Louis, MO?
The distance between St Louis (St. Louis Lambert International Airport) and Helena (Helena Regional Airport) is 1222 miles / 1966 kilometers / 1062 nautical miles.
The driving distance from St Louis (STL) to Helena (HLN) is 1493 miles / 2402 kilometers, and travel time by car is about 26 hours 37 minutes.
St. Louis Lambert International Airport – Helena Regional Airport
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Distance from St Louis to Helena
There are several ways to calculate the distance from St Louis to Helena. Here are two standard 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 planet.
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).
How long does it take to fly from St Louis to Helena?
The estimated flight time from St. Louis Lambert International Airport to Helena Regional Airport is 2 hours and 48 minutes.
What is the time difference between St Louis and Helena?
The time difference between St Louis and Helena is 1 hour. Helena is 1 hour behind St Louis.
Flight carbon footprint between St. Louis Lambert International Airport (STL) and Helena Regional Airport (HLN)
On average, flying from St Louis to Helena generates about 162 kg of CO2 per passenger, and 162 kilograms equals 358 pounds (lbs). The figures are estimates and include only the CO2 generated by burning jet fuel.
Map of flight path and driving directions from St Louis to Helena
See the map of the shortest flight path between St. Louis Lambert International Airport (STL) and Helena Regional Airport (HLN).
Airport information
| Origin | 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 |
| Destination | Helena Regional Airport |
|---|---|
| City: | Helena, MT |
| Country: | United States |
| IATA Code: | HLN |
| ICAO Code: | KHLN |
| Coordinates: | 46°36′24″N, 111°58′58″W |