There are
1,039 mi
from Hereford, TX to San Dimas, CA
That's the driving distance. It would take 17 hours 50 mins to go from Hereford, Texas to San Dimas, California.
The flight distance (direct flight from Hereford, TX to San Dimas, CA) is 878.33 mi.
1,039 mi = 1,671.73 kms