Miles between Decatur, IL and St Peters, MO

There are
138 mi
from Decatur, IL to St Peters, MO

That's the driving distance. It would take 2 hours 57 mins to go from Decatur, Illinois to St Peters, Missouri.

The flight distance (direct flight from Decatur, IL to St Peters, MO) is 114.75 mi.

138 mi = 222.57 kms