There are
1,455 mi
from Garland, TX to Simi Valley, CA
That's the driving distance. It would take 1 day 1 hour to go from Garland, Texas to Simi Valley, California.
The flight distance (direct flight from Garland, TX to Simi Valley, CA) is 1,275.32 mi.
1,455 mi = 2,341.67 kms