Calculations with different methods
- 4823.115 miles
- 7762.052 kilometers
- 4191.173 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
- 4810.711 miles
- 7742.090 kilometers
- 4180.394 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 Leonardo da Vinci–Fiumicino Airport (FCO) is 9 hours 37 minutes.
Time difference and current local times
The time difference between Chicago and Rome is 7 hours. Rome is 7 hours ahead of Chicago.
Carbon dioxide emissions
Estimated CO2 emissions per passenger is 597 kg (1 316 pounds).
Chicago to Rome flight map.
Frequent Flyer Miles Calculator
Chicago (ORD) → Rome (FCO).