There are
1,872 mi
from Walnut Creek, CA to Ottumwa, IA
That's the driving distance. It would take 1 day 8 hours to go from Walnut Creek, California to Ottumwa, Iowa.
The flight distance (direct flight from Walnut Creek, CA to Ottumwa, IA) is 1,588.77 mi.
1,872 mi = 3,011.98 kms