Calculations with different methods
- 588.645 miles
- 947.332 kilometers
- 511.518 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
- 587.448 miles
- 945.406 kilometers
- 510.478 nautical miles
The haversine formula calculates the distance between latitude/longitude points assuming a spherical earth (great-circle distance).
Estimated flight time from O'Hare International Airport (ORD) to Washington Dulles International Airport (IAD) is 1 hour 36 minutes.
Time difference and current local times
The time difference between Chicago and Washington D.C. is 1 hour. Washington D.C. is 1 hour ahead of Chicago.
Carbon dioxide emissions
Estimated CO2 emissions per passenger is 101 kg (223 pounds).
Chicago to Washington D.C. flight map.
Frequent Flyer Miles Calculator
Chicago (ORD) → Washington D.C. (IAD).