How far is San Antonio, TX, from Helena, MT?
The distance between Helena (Helena Regional Airport) and San Antonio (San Antonio International Airport) is 1385 miles / 2228 kilometers / 1203 nautical miles.
The driving distance from Helena (HLN) to San Antonio (SAT) is 1722 miles / 2771 kilometers, and travel time by car is about 30 hours 18 minutes.
Helena Regional Airport – San Antonio International Airport
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Distance from Helena to San Antonio
There are several ways to calculate the distance from Helena to San Antonio. 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 Helena to San Antonio?
The estimated flight time from Helena Regional Airport to San Antonio International Airport is 3 hours and 7 minutes.
What is the time difference between Helena and San Antonio?
The time difference between Helena and San Antonio is 1 hour. San Antonio is 1 hour ahead of Helena.
Flight carbon footprint between Helena Regional Airport (HLN) and San Antonio International Airport (SAT)
On average, flying from Helena to San Antonio 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 Helena to San Antonio
See the map of the shortest flight path between Helena Regional Airport (HLN) and San Antonio International Airport (SAT).
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 | 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 |