Miles between Decatur, IL and Mt Vernon, IL

There are
123 mi
from Decatur, IL to Mt Vernon, IL

That's the driving distance. It would take 2 hours 29 mins to go from Decatur, Illinois to Mt Vernon, Illinois.

The flight distance (direct flight from Decatur, IL to Mt Vernon, IL) is 105.27 mi.

123 mi = 197.22 kms