Miles between St Louis, MO and Alton, IL

There are
24 mi
from St Louis, MO to Alton, IL

That's the driving distance. It would take 32 minutes to go from St Louis, Missouri to Alton, Illinois.

The flight distance (direct flight from St Louis, MO to Alton, IL) is 18.23 mi.

24 mi = 39.04 kms