There are
1,950 mi
from Walnut Creek, CA to Rock Island, IL
That's the driving distance. It would take 1 day 9 hours to go from Walnut Creek, California to Rock Island, Illinois.
The flight distance (direct flight from Walnut Creek, CA to Rock Island, IL) is 1,682.56 mi.
1,950 mi = 3,137.52 kms