How far is Ontario from Chicago?
There are several ways to calculate distances between Chicago and Ontario. Here are two common methods:Vincenty's formula (applied above)
- 1699.875 miles
- 2735.684 kilometers
- 1477.151 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
- 1696.557 miles
- 2730.343 kilometers
- 1474.267 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 Ontario International Airport (ONT) is 3 hours 43 minutes.
Time difference and current local times
The time difference between Chicago and Ontario is 2 hours. Ontario is 2 hours behind Chicago.
Carbon dioxide emissions
Estimated CO2 emissions per passenger is 187 kg (411 pounds).
Chicago to Ontario flight path
Shortest flight path between Chicago O'Hare International Airport (ORD) and Ontario International Airport (ONT).
Frequent Flyer Miles Calculator
Chicago (ORD) → Ontario (ONT).