Map of flight path and driving directions from Washington D.C. to Fort Smith.
Shortest flight path between Washington Dulles International Airport (IAD) and Fort Smith Regional Airport (FSM).
How far is Fort Smith from Washington D.C.?
There are several ways to calculate distances between Washington D.C. and Fort Smith. Here are two common methods:Vincenty's formula (applied above)
- 964.619 miles
- 1552.404 kilometers
- 838.231 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
- 962.640 miles
- 1549.219 kilometers
- 836.511 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).
Time difference and current local times
The time difference between Washington D.C. and Fort Smith is 1 hour. Fort Smith is 1 hour behind Washington D.C..
Fort Smith, AR
Carbon dioxide emissions
Estimated CO2 emissions per passenger is 148 kg (327 pounds).
Frequent Flyer Miles Calculator
Washington D.C. (IAD) → Fort Smith (FSM).