There are
1,814 mi
from Monterey Park, CA to Clayton, MO
That's the driving distance. It would take 1 day 7 hours to go from Monterey Park, California to Clayton, Missouri.
The flight distance (direct flight from Monterey Park, CA to Clayton, MO) is 1,572.61 mi.
1,814 mi = 2,919.47 kms