There are
2,151 mi
from Dayton, OH to San Dimas, CA
That's the driving distance. It would take 1 day 13 hours to go from Dayton, Ohio to San Dimas, California.
The flight distance (direct flight from Dayton, OH to San Dimas, CA) is 1,885.57 mi.
2,151 mi = 3,461.88 kms