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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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2013
Miles
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3240
Kilometers
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1750
Nautical miles

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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.

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 Flag of 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 Flag of United States
IATA Code: PSM
ICAO Code: KPSM
Coordinates: 43°4′40″N, 70°49′23″W