There are
1,939 mi
from Folsom, CA to St Charles, MO
That's the driving distance. It would take 1 day 9 hours to go from Folsom, California to St Charles, Missouri.
The flight distance (direct flight from Folsom, CA to St Charles, MO) is 1,644.89 mi.
1,939 mi = 3,120.57 kms