There are
2,150 mi
from Walnut Creek, CA to Brookfield, WI
That's the driving distance. It would take 1 day 13 hours to go from Walnut Creek, California to Brookfield, Wisconsin.
The flight distance (direct flight from Walnut Creek, CA to Brookfield, WI) is 1,806.88 mi.
2,150 mi = 3,459.73 kms