There are
2,245 mi
from Walnut Creek, CA to Portage, MI
That's the driving distance. It would take 1 day 14 hours to go from Walnut Creek, California to Portage, Michigan.
The flight distance (direct flight from Walnut Creek, CA to Portage, MI) is 1,937.22 mi.
2,245 mi = 3,613.58 kms