There are
1,085 mi
from Simi Valley, CA to Hereford, TX
That's the driving distance. It would take 19 hours to go from Simi Valley, California to Hereford, Texas.
The flight distance (direct flight from Simi Valley, CA to Hereford, TX) is 932.13 mi.
1,085 mi = 1,746.46 kms