There are
2,366 mi
from Dayton, OH to Walnut Creek, CA
That's the driving distance. It would take 1 day 17 hours to go from Dayton, Ohio to Walnut Creek, California.
The flight distance (direct flight from Dayton, OH to Walnut Creek, CA) is 2,027.27 mi.
2,366 mi = 3.22 kms