There are
1,821 mi
from St Charles, MO to Monterey Park, CA
That's the driving distance. It would take 1 day 7 hours to go from St Charles, Missouri to Monterey Park, California.
The flight distance (direct flight from St Charles, MO to Monterey Park, CA) is 1,563.06 mi.
1,821 mi = 2,931.06 kms