Air Miles Calculator

Distance between Washington D.C. (DCA) and Portsmouth, NH (PSM)

Flight distance from Washington D.C. to Portsmouth (Ronald Reagan Washington National Airport – Portsmouth International Airport at Pease) is 436 miles / 702 kilometers / 379 nautical miles. Estimated flight time is 1 hour 19 minutes.

Driving distance from Washington D.C. (DCA) to Portsmouth (PSM) is 490 miles / 789 kilometers and travel time by car is about 9 hours 32 minutes.

Map of flight path and driving directions from Washington D.C. to Portsmouth.

Shortest flight path between Ronald Reagan Washington National Airport (DCA) and Portsmouth International Airport at Pease (PSM).

How far is Portsmouth from Washington D.C.?

There are several ways to calculate distances between Washington D.C. and Portsmouth. Here are two common methods:

Vincenty's formula (applied above)
  • 436.454 miles
  • 702.404 kilometers
  • 379.268 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
  • 436.086 miles
  • 701.813 kilometers
  • 378.948 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 Ronald Reagan Washington National Airport
City: Washington D.C.
Country: United States Flag of United States
IATA Code: DCA
ICAO Code: KDCA
Coordinates: 38°51′7″N, 77°2′15″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

There is no time difference between Washington D.C. and Portsmouth.

Time Difference

Washington D.C.

 EST

Portsmouth, NH

 EST

Carbon dioxide emissions

Estimated CO2 emissions per passenger is 89 kg (197 pounds).

Frequent Flyer Miles Calculator

Washington D.C. (DCA) → Portsmouth (PSM).

Distance:
436
Elite level bonus:
0
Booking class bonus:
0

In total

Total frequent flyer miles:
436

Round trip?