There are
2,055 mi
from Simi Valley, CA to Gallatin, TN
That's the driving distance. It would take 1 day 12 hours to go from Simi Valley, California to Gallatin, Tennessee.
The flight distance (direct flight from Simi Valley, CA to Gallatin, TN) is 1,820.05 mi.
2,055 mi = 3.22 kms