There are
1,670 mi
from Simi Valley, CA to Brownsville, TX
That's the driving distance. It would take 1 day 4 hours to go from Simi Valley, California to Brownsville, Texas.
The flight distance (direct flight from Simi Valley, CA to Brownsville, TX) is 1,393.85 mi.
1,670 mi = 1.61 kms