Calculations with different methods
- 530.522 miles
- 853.793 kilometers
- 461.011 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
- 529.982 miles
- 852.923 kilometers
- 460.542 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 Roanoke–Blacksburg Regional Airport (ROA) is 1 hour 30 minutes.
Time difference and current local times
The time difference between Chicago and Roanoke is 1 hour. Roanoke is 1 hour ahead of Chicago.
Carbon dioxide emissions
Estimated CO2 emissions per passenger is 95 kg (209 pounds).
Chicago to Roanoke flight map.
Frequent Flyer Miles Calculator
Chicago (ORD) → Roanoke (ROA).