How far is Helena, MT, from San Antonio, TX?
The distance between San Antonio (San Antonio International Airport) and Helena (Helena Regional Airport) is 1385 miles / 2228 kilometers / 1203 nautical miles.
The driving distance from San Antonio (SAT) to Helena (HLN) is 1721 miles / 2770 kilometers, and travel time by car is about 30 hours 13 minutes.
San Antonio International Airport – Helena Regional Airport
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Distance from San Antonio to Helena
There are several ways to calculate the distance from San Antonio to Helena. Here are two standard methods:
Vincenty's formula (applied above)- 1384.591 miles
- 2228.283 kilometers
- 1203.177 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- 1385.444 miles
- 2229.656 kilometers
- 1203.918 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 San Antonio to Helena?
The estimated flight time from San Antonio International Airport to Helena Regional Airport is 3 hours and 7 minutes.
What is the time difference between San Antonio and Helena?
The time difference between San Antonio and Helena is 1 hour. Helena is 1 hour behind San Antonio.
Flight carbon footprint between San Antonio International Airport (SAT) and Helena Regional Airport (HLN)
On average, flying from San Antonio to Helena generates about 172 kg of CO2 per passenger, and 172 kilograms equals 380 pounds (lbs). The figures are estimates and include only the CO2 generated by burning jet fuel.
Map of flight path and driving directions from San Antonio to Helena
See the map of the shortest flight path between San Antonio International Airport (SAT) and Helena Regional Airport (HLN).
Airport information
| Origin | San Antonio International Airport |
|---|---|
| City: | San Antonio, TX |
| Country: | United States  |
| IATA Code: | SAT |
| ICAO Code: | KSAT |
| Coordinates: | 29°32′1″N, 98°28′11″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 |