There are
1,894 mi
from Walnut Creek, CA to Waterloo, IA
That's the driving distance. It would take 1 day 8 hours to go from Walnut Creek, California to Waterloo, Iowa.
The flight distance (direct flight from Walnut Creek, CA to Waterloo, IA) is 1,591.65 mi.
1,894 mi = 3,048.20 kms