How far is Helena, MT, from Portsmouth, NH?
The distance between Portsmouth (Portsmouth International Airport at Pease) and Helena (Helena Regional Airport) is 2013 miles / 3240 kilometers / 1750 nautical miles.
The driving distance from Portsmouth (PSM) to Helena (HLN) is 2408 miles / 3875 kilometers, and travel time by car is about 45 hours 23 minutes.
Portsmouth International Airport at Pease – Helena Regional Airport
Search flights
Distance from Portsmouth to Helena
There are several ways to calculate the distance from Portsmouth to Helena. Here are two standard methods:
Vincenty's formula (applied above)- 2013.468 miles
- 3240.363 kilometers
- 1749.656 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- 2007.971 miles
- 3231.517 kilometers
- 1744.879 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 Portsmouth to Helena?
The estimated flight time from Portsmouth International Airport at Pease to Helena Regional Airport is 4 hours and 18 minutes.
What is the time difference between Portsmouth and Helena?
The time difference between Portsmouth and Helena is 2 hours. Helena is 2 hours behind Portsmouth.
Flight carbon footprint between Portsmouth International Airport at Pease (PSM) and Helena Regional Airport (HLN)
On average, flying from Portsmouth to Helena generates about 219 kg of CO2 per passenger, and 219 kilograms equals 483 pounds (lbs). The figures are estimates and include only the CO2 generated by burning jet fuel.
Map of flight path and driving directions from Portsmouth to Helena
See the map of the shortest flight path between Portsmouth International Airport at Pease (PSM) and Helena Regional Airport (HLN).
Airport information
| Origin | Portsmouth International Airport at Pease |
|---|---|
| City: | Portsmouth, NH |
| Country: | United States  |
| IATA Code: | PSM |
| ICAO Code: | KPSM |
| Coordinates: | 43°4′40″N, 70°49′23″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 |