There are
2,363 mi
from Middletown, OH to Walnut Creek, CA
That's the driving distance. It would take 1 day 17 hours to go from Middletown, Ohio to Walnut Creek, California.
The flight distance (direct flight from Middletown, OH to Walnut Creek, CA) is 2,018.99 mi.
2,363 mi = 3,803.21 kms