There are
2,156 mi
from Middletown, OH to Walnut, CA
That's the driving distance. It would take 1 day 14 hours to go from Middletown, Ohio to Walnut, California.
The flight distance (direct flight from Middletown, OH to Walnut, CA) is 1,879.53 mi.
2,156 mi = 3,470.40 kms