There are
2,065 mi
from St Charles, MO to Monterey, CA
That's the driving distance. It would take 1 day 12 hours to go from St Charles, Missouri to Monterey, California.
The flight distance (direct flight from St Charles, MO to Monterey, CA) is 1,714.02 mi.
2,065 mi = 3,323.09 kms