How far is Helena, MT, from Watertown, SD?
The distance between Watertown (Watertown Regional Airport) and Helena (Helena Regional Airport) is 725 miles / 1167 kilometers / 630 nautical miles.
The driving distance from Watertown (ATY) to Helena (HLN) is 967 miles / 1556 kilometers, and travel time by car is about 16 hours 53 minutes.
Watertown Regional Airport – Helena Regional Airport
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Distance from Watertown to Helena
There are several ways to calculate the distance from Watertown to Helena. 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 Watertown to Helena?
The estimated flight time from Watertown Regional Airport to Helena Regional Airport is 1 hour and 52 minutes.
What is the time difference between Watertown and Helena?
The time difference between Watertown and Helena is 1 hour. Helena is 1 hour behind Watertown.
Flight carbon footprint between Watertown Regional Airport (ATY) and Helena Regional Airport (HLN)
On average, flying from Watertown to Helena 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 Watertown to Helena
See the map of the shortest flight path between Watertown Regional Airport (ATY) and Helena Regional Airport (HLN).
Airport information
| Origin | Watertown Regional Airport |
|---|---|
| City: | Watertown, SD |
| Country: | United States  |
| IATA Code: | ATY |
| ICAO Code: | KATY |
| Coordinates: | 44°54′50″N, 97°9′16″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 |