There are
2,255 mi
from Diamond Bar, CA to Ashland, KY
That's the driving distance. It would take 1 day 15 hours to go from Diamond Bar, California to Ashland, Kentucky.
The flight distance (direct flight from Diamond Bar, CA to Ashland, KY) is 1,971.51 mi.
2,255 mi = 3,628.69 kms