There are
1,783 mi
from Walnut Creek, CA to Spencer, IA
That's the driving distance. It would take 1 day 7 hours to go from Walnut Creek, California to Spencer, Iowa.
The flight distance (direct flight from Walnut Creek, CA to Spencer, IA) is 1,452.53 mi.
1,783 mi = 2,869.20 kms