How far is Portsmouth, NH, from Washington D.C.?
The distance between Washington D.C. (Washington Dulles International Airport) and Portsmouth (Portsmouth International Airport at Pease) is 449 miles / 722 kilometers / 390 nautical miles.
The driving distance from Washington D.C. (IAD) to Portsmouth (PSM) is 514 miles / 827 kilometers, and travel time by car is about 10 hours 33 minutes.
Washington Dulles International Airport – Portsmouth International Airport at Pease
Search flights
Distance from Washington D.C. to Portsmouth
There are several ways to calculate the distance from Washington D.C. to Portsmouth. Here are two standard methods:
Vincenty's formula (applied above)- 448.683 miles
- 722.085 kilometers
- 389.895 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- 448.230 miles
- 721.356 kilometers
- 389.501 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 Washington D.C. to Portsmouth?
The estimated flight time from Washington Dulles International Airport to Portsmouth International Airport at Pease is 1 hour and 20 minutes.
What is the time difference between Washington D.C. and Portsmouth?
There is no time difference between Washington D.C. and Portsmouth.
Flight carbon footprint between Washington Dulles International Airport (IAD) and Portsmouth International Airport at Pease (PSM)
On average, flying from Washington D.C. to Portsmouth generates about 91 kg of CO2 per passenger, and 91 kilograms equals 201 pounds (lbs). The figures are estimates and include only the CO2 generated by burning jet fuel.
Map of flight path and driving directions from Washington D.C. to Portsmouth
See the map of the shortest flight path between Washington Dulles International Airport (IAD) and Portsmouth International Airport at Pease (PSM).
Airport information
| Origin | Washington Dulles International Airport |
|---|---|
| City: | Washington D.C. |
| Country: | United States  |
| IATA Code: | IAD |
| ICAO Code: | KIAD |
| Coordinates: | 38°56′40″N, 77°27′20″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 |