There are
2,049 mi
from Walnut Creek, CA to Cahokia, IL
That's the driving distance. It would take 1 day 11 hours to go from Walnut Creek, California to Cahokia, Illinois.
The flight distance (direct flight from Walnut Creek, CA to Cahokia, IL) is 1,721.70 mi.
2,049 mi = 3,296.81 kms