There are
1,565 mi
from Simi Valley, CA to Rosenberg, TX
That's the driving distance. It would take 1 day 2 hours to go from Simi Valley, California to Rosenberg, Texas.
The flight distance (direct flight from Simi Valley, CA to Rosenberg, TX) is 1,382.83 mi.
1,565 mi = 1.61 kms