How far is Rome from Chicago?
There are several ways to calculate distances between Chicago and Rome. 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 Chicago 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 568 kg (1 253 pounds).
Chicago to Rome flight path
Shortest flight path between Chicago O'Hare International Airport (ORD) and Leonardo da Vinci–Fiumicino Airport (FCO).
Frequent Flyer Miles Calculator
Chicago (ORD) → Rome (FCO).