Map of flight path and driving directions from Washington D.C. to Decatur.
Shortest flight path between Washington Dulles International Airport (IAD) and Decatur Airport (DEC).
How far is Decatur from Washington D.C.?
There are several ways to calculate distances between Washington D.C. and Decatur. Here are two common methods:Vincenty's formula (applied above)
- 613.435 miles
- 987.229 kilometers
- 533.061 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
- 611.948 miles
- 984.835 kilometers
- 531.768 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 Decatur is 1 hour. Decatur is 1 hour behind Washington D.C..
Carbon dioxide emissions
Estimated CO2 emissions per passenger is 114 kg (252 pounds).
Frequent Flyer Miles Calculator
Washington D.C. (IAD) → Decatur (DEC).