How far is Chicago from Rome?
There are several ways to calculate distances between Rome and Chicago. Here are two common methods:Vincenty's formula (applied above)
- 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 – the shortest distance between two points).
Estimated flight time from Leonardo da Vinci–Fiumicino Airport (FCO) to O'Hare International Airport (ORD) is 9 hours 37 minutes.
Time difference and current local times
The time difference between Rome and Chicago is 7 hours. Chicago is 7 hours behind Rome.
Carbon dioxide emissions
Estimated CO2 emissions per passenger is 568 kg (1 253 pounds).
Rome to Chicago flight map.
Frequent Flyer Miles Calculator
Rome (FCO) → Chicago (ORD).