There are
1,604 mi
from Simi Valley, CA to Deer Park, TX
That's the driving distance. It would take 1 day 3 hours to go from Simi Valley, California to Deer Park, Texas.
The flight distance (direct flight from Simi Valley, CA to Deer Park, TX) is 1,418.28 mi.
1,604 mi = 1.61 kms