How far is St Louis, MO, from Helena, MT?
The distance between Helena (Helena Regional Airport) and St Louis (St. Louis Lambert International Airport) is 1222 miles / 1966 kilometers / 1062 nautical miles.
The driving distance from Helena (HLN) to St Louis (STL) is 1498 miles / 2411 kilometers, and travel time by car is about 26 hours 18 minutes.
Helena Regional Airport – St. Louis Lambert International Airport
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Distance from Helena to St Louis
There are several ways to calculate the distance from Helena to St Louis. 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 Helena to St Louis?
The estimated flight time from Helena Regional Airport to St. Louis Lambert International Airport is 2 hours and 48 minutes.
What is the time difference between Helena and St Louis?
The time difference between Helena and St Louis is 1 hour. St Louis is 1 hour ahead of Helena.
Flight carbon footprint between Helena Regional Airport (HLN) and St. Louis Lambert International Airport (STL)
On average, flying from Helena to St Louis 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 Helena to St Louis
See the map of the shortest flight path between Helena Regional Airport (HLN) and St. Louis Lambert International Airport (STL).
Airport information
| Origin | Helena Regional Airport |
|---|---|
| City: | Helena, MT |
| Country: | United States  |
| IATA Code: | HLN |
| ICAO Code: | KHLN |
| Coordinates: | 46°36′24″N, 111°58′58″W |
| Destination | 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 |