There are
2,104 mi
from Walnut Creek, CA to Brookfield, IL
That's the driving distance. It would take 1 day 12 hours to go from Walnut Creek, California to Brookfield, Illinois.
The flight distance (direct flight from Walnut Creek, CA to Brookfield, IL) is 1,822.26 mi.
2,104 mi = 3,385.31 kms