Map of flight path and driving directions from San Diego to Helena.
Shortest flight path between San Diego International Airport (SAN) and Helena Regional Airport (HLN).
How far is Helena from San Diego?
There are several ways to calculate distances between San Diego and Helena. Here are two common 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 earth.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).
Time difference and current local times
The time difference between San Diego and Helena is 1 hour. Helena is 1 hour ahead of San Diego.
San Diego, CA
Carbon dioxide emissions
Estimated CO2 emissions per passenger is 151 kg (332 pounds).
Frequent Flyer Miles Calculator
San Diego (SAN) → Helena (HLN).