Miles between Simi Valley, CA and Great Falls, MT

There are
1,275 mi
from Simi Valley, CA to Great Falls, MT

That's the driving distance. It would take 21 hours 45 mins to go from Simi Valley, California to Great Falls, Montana.

The flight distance (direct flight from Simi Valley, CA to Great Falls, MT) is 993 mi.

1,275 mi = 1.61 kms