How far is Watertown, SD, from Helena, MT?
The distance between Helena (Helena Regional Airport) and Watertown (Watertown Regional Airport) is 725 miles / 1167 kilometers / 630 nautical miles.
The driving distance from Helena (HLN) to Watertown (ATY) is 966 miles / 1555 kilometers, and travel time by car is about 16 hours 51 minutes.
Helena Regional Airport – Watertown Regional Airport
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Distance from Helena to Watertown
There are several ways to calculate the distance from Helena to Watertown. Here are two standard methods:
Vincenty's formula (applied above)- 725.160 miles
- 1167.031 kilometers
- 630.146 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- 723.166 miles
- 1163.822 kilometers
- 628.414 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 Watertown?
The estimated flight time from Helena Regional Airport to Watertown Regional Airport is 1 hour and 52 minutes.
What is the time difference between Helena and Watertown?
The time difference between Helena and Watertown is 1 hour. Watertown is 1 hour ahead of Helena.
Flight carbon footprint between Helena Regional Airport (HLN) and Watertown Regional Airport (ATY)
On average, flying from Helena to Watertown generates about 127 kg of CO2 per passenger, and 127 kilograms equals 281 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 Watertown
See the map of the shortest flight path between Helena Regional Airport (HLN) and Watertown Regional Airport (ATY).
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 | Watertown Regional Airport |
|---|---|
| City: | Watertown, SD |
| Country: | United States |
| IATA Code: | ATY |
| ICAO Code: | KATY |
| Coordinates: | 44°54′50″N, 97°9′16″W |