How far is San Diego, CA, from Helena, MT?
The distance between Helena (Helena Regional Airport) and San Diego (San Diego International Airport) is 996 miles / 1603 kilometers / 865 nautical miles.
The driving distance from Helena (HLN) to San Diego (SAN) is 1234 miles / 1986 kilometers, and travel time by car is about 20 hours 53 minutes.
Helena Regional Airport – San Diego International Airport
Search flights
Distance from Helena to San Diego
There are several ways to calculate the distance from Helena to San Diego. Here are two standard methods:
Vincenty's formula (applied above)- 995.974 miles
- 1602.865 kilometers
- 865.478 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- 997.159 miles
- 1604.772 kilometers
- 866.508 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 Diego?
The estimated flight time from Helena Regional Airport to San Diego International Airport is 2 hours and 23 minutes.
What is the time difference between Helena and San Diego?
The time difference between Helena and San Diego is 1 hour. San Diego is 1 hour behind Helena.
Flight carbon footprint between Helena Regional Airport (HLN) and San Diego International Airport (SAN)
On average, flying from Helena to San Diego generates about 151 kg of CO2 per passenger, and 151 kilograms equals 332 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 Diego
See the map of the shortest flight path between Helena Regional Airport (HLN) and San Diego International Airport (SAN).
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 Diego International Airport |
|---|---|
| City: | San Diego, CA |
| Country: | United States |
| IATA Code: | SAN |
| ICAO Code: | KSAN |
| Coordinates: | 32°44′0″N, 117°11′24″W |