There are
544 mi
from Cheyenne, WY to Hereford, TX
That's the driving distance. It would take 9 hours 48 mins to go from Cheyenne, Wyoming to Hereford, Texas.
The flight distance (direct flight from Cheyenne, WY to Hereford, TX) is 456.43 mi.
544 mi = 874.74 kms