There are
406 mi
from Hereford, TX to Okmulgee, OK
That's the driving distance. It would take 7 hours 7 mins to go from Hereford, Texas to Okmulgee, Oklahoma.
The flight distance (direct flight from Hereford, TX to Okmulgee, OK) is 367.57 mi.
406 mi = 653.68 kms