There are
1,946 mi
from Walnut Creek, CA to Quincy, IL
That's the driving distance. It would take 1 day 9 hours to go from Walnut Creek, California to Quincy, Illinois.
The flight distance (direct flight from Walnut Creek, CA to Quincy, IL) is 1,645.73 mi.
1,946 mi = 3,131.26 kms