How far is Portsmouth, NH, from Helena, MT?
The distance between Helena (Helena Regional Airport) and Portsmouth (Portsmouth International Airport at Pease) is 2013 miles / 3240 kilometers / 1750 nautical miles.
The driving distance from Helena (HLN) to Portsmouth (PSM) is 2411 miles / 3880 kilometers, and travel time by car is about 45 hours 28 minutes.
Helena Regional Airport – Portsmouth International Airport at Pease
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Distance from Helena to Portsmouth
There are several ways to calculate the distance from Helena to Portsmouth. 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 Helena to Portsmouth?
The estimated flight time from Helena Regional Airport to Portsmouth International Airport at Pease is 4 hours and 18 minutes.
What is the time difference between Helena and Portsmouth?
The time difference between Helena and Portsmouth is 2 hours. Portsmouth is 2 hours ahead of Helena.
Flight carbon footprint between Helena Regional Airport (HLN) and Portsmouth International Airport at Pease (PSM)
On average, flying from Helena to Portsmouth 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 Helena to Portsmouth
See the map of the shortest flight path between Helena Regional Airport (HLN) and Portsmouth International Airport at Pease (PSM).
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 | 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 |