There are
1,896 mi
from Iowa City, IA to Walnut Creek, CA
That's the driving distance. It would take 1 day 8 hours to go from Iowa City, Iowa to Walnut Creek, California.
The flight distance (direct flight from Iowa City, IA to Walnut Creek, CA) is 1,633.13 mi.
1,896 mi = 1.61 kms