There are
1,461 mi
from Simi Valley, CA to Mansfield, TX
That's the driving distance. It would take 1 day 1 hour to go from Simi Valley, California to Mansfield, Texas.
The flight distance (direct flight from Simi Valley, CA to Mansfield, TX) is 1,251.16 mi.
1,461 mi = 1.61 kms