There are
2,454 mi
from Middletown, OH to Watsonville, CA
That's the driving distance. It would take 1 day 19 hours to go from Middletown, Ohio to Watsonville, California.
The flight distance (direct flight from Middletown, OH to Watsonville, CA) is 2,021.57 mi.
2,454 mi = 3,949.01 kms