There are
921 mi
from Hereford, TX to Calexico, CA
That's the driving distance. It would take 16 hours 49 mins to go from Hereford, Texas to Calexico, California.
The flight distance (direct flight from Hereford, TX to Calexico, CA) is 766.40 mi.
921 mi = 1,481.48 kms