There are
2,041 mi
from St Charles, MO to Pleasanton, CA
That's the driving distance. It would take 1 day 11 hours to go from St Charles, Missouri to Pleasanton, California.
The flight distance (direct flight from St Charles, MO to Pleasanton, CA) is 1,695.77 mi.
2,041 mi = 3,284.34 kms