There are
1,820 mi
from Monterey Park, CA to St Charles, MO
That's the driving distance. It would take 1 day 7 hours to go from Monterey Park, California to St Charles, Missouri.
The flight distance (direct flight from Monterey Park, CA to St Charles, MO) is 1,563.06 mi.
1,820 mi = 2,929.45 kms