There are
2,125 mi
from Walnut Creek, CA to Deerfield, IL
That's the driving distance. It would take 1 day 12 hours to go from Walnut Creek, California to Deerfield, Illinois.
The flight distance (direct flight from Walnut Creek, CA to Deerfield, IL) is 1,821.54 mi.
2,125 mi = 3,419.99 kms