There are
1,815 mi
from Westminster, CA to Chesterfield, MO
That's the driving distance. It would take 1 day 7 hours to go from Westminster, California to Chesterfield, Missouri.
The flight distance (direct flight from Westminster, CA to Chesterfield, MO) is 1,559.49 mi.
1,815 mi = 2,920.47 kms