Air Miles Calculator

Distance between St Louis, MO (STL) and Portsmouth, NH (PSM)

Flight distance from St Louis to Portsmouth (St. Louis Lambert International Airport – Portsmouth International Airport at Pease) is 1063 miles / 1711 kilometers / 924 nautical miles. Estimated flight time is 2 hours 30 minutes.

Driving distance from St Louis (STL) to Portsmouth (PSM) is 1239 miles / 1994 kilometers and travel time by car is about 22 hours 8 minutes.

Map of flight path and driving directions from St Louis to Portsmouth.

Shortest flight path between St. Louis Lambert International Airport (STL) and Portsmouth International Airport at Pease (PSM).

How far is Portsmouth from St Louis?

There are several ways to calculate distances between St Louis and Portsmouth. Here are two common methods:

Vincenty's formula (applied above)
  • 1063.122 miles
  • 1710.929 kilometers
  • 923.828 nautical miles

Vincenty's formula calculates the distance between latitude/longitude points on the earth’s surface, using an ellipsoidal model of the earth.

Haversine formula
  • 1060.732 miles
  • 1707.083 kilometers
  • 921.751 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).

Airport information


A St. Louis Lambert International Airport
City: St Louis, MO
Country: United States Flag of United States
IATA Code: STL
ICAO Code: KSTL
Coordinates: 38°44′55″N, 90°22′12″W

B 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

Time difference and current local times

The time difference between St Louis and Portsmouth is 1 hour. Portsmouth is 1 hour ahead of St Louis.

Time Difference

St Louis, MO

 CST

Portsmouth, NH

 EST

Carbon dioxide emissions

Estimated CO2 emissions per passenger is 155 kg (341 pounds).

Frequent Flyer Miles Calculator

St Louis (STL) → Portsmouth (PSM).

Distance:
1063
Elite level bonus:
0
Booking class bonus:
0

In total

Total frequent flyer miles:
1063

Round trip?