There are
2,145 mi
from Middletown, OH to Riverside, CA
That's the driving distance. It would take 1 day 13 hours to go from Middletown, Ohio to Riverside, California.
The flight distance (direct flight from Middletown, OH to Riverside, CA) is 1,856.23 mi.
2,145 mi = 3,452.16 kms