There are
2,029 mi
from Walnut Creek, CA to Ballwin, MO
That's the driving distance. It would take 1 day 11 hours to go from Walnut Creek, California to Ballwin, Missouri.
The flight distance (direct flight from Walnut Creek, CA to Ballwin, MO) is 1,702.42 mi.
2,029 mi = 3,265.16 kms