There are
1,402 mi
from Simi Valley, CA to Stephenville, TX
That's the driving distance. It would take 1 day to go from Simi Valley, California to Stephenville, Texas.
The flight distance (direct flight from Simi Valley, CA to Stephenville, TX) is 1,195.47 mi.
1,402 mi = 1.61 kms