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 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 201 kg (443 pounds).
Chicago to Ontario flight map.
Frequent Flyer Miles Calculator
Chicago (ORD) → Ontario (ONT).