Calculations with different methods
- 397.127 miles
- 639.113 kilometers
- 345.094 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
- 397.006 miles
- 638.920 kilometers
- 344.989 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 Duluth International Airport (DLH) is 1 hour 15 minutes.
Time difference and current local times
There is no time difference between Chicago and Duluth.
Carbon dioxide emissions
Estimated CO2 emissions per passenger is 80 kg (176 pounds).
Chicago to Duluth flight map.
Frequent Flyer Miles Calculator
Chicago (ORD) → Duluth (DLH).