There are
1,922 mi
from Walnut Creek, CA to Columbia, MO
That's the driving distance. It would take 1 day 8 hours to go from Walnut Creek, California to Columbia, Missouri.
The flight distance (direct flight from Walnut Creek, CA to Columbia, MO) is 1,603.70 mi.
1,922 mi = 3,092.59 kms