There are
2,022 mi
from Walnut Creek, CA to St Charles, MO
That's the driving distance. It would take 1 day 10 hours to go from Walnut Creek, California to St Charles, Missouri.
The flight distance (direct flight from Walnut Creek, CA to St Charles, MO) is 1,702.36 mi.
2,022 mi = 3,254.73 kms