# 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
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
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.

EST

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## 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?