Map of flight path and driving directions from Chicago to Alpena.
Shortest flight path between Chicago O'Hare International Airport (ORD) and Alpena County Regional Airport (APN).
How far is Alpena from Chicago?
There are several ways to calculate distances between Chicago and Alpena. Here are two common methods:Vincenty's formula (applied above)
- 305.542 miles
- 491.722 kilometers
- 265.509 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
- 305.246 miles
- 491.245 kilometers
- 265.251 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).
Time difference and current local times
The time difference between Chicago and Alpena is 1 hour. Alpena is 1 hour ahead of Chicago.
Carbon dioxide emissions
Estimated CO2 emissions per passenger is 70 kg (154 pounds).
Frequent Flyer Miles Calculator
Chicago (ORD) → Alpena (APN).