There are
1,388 mi
from Rapid City, SD to Petaluma, CA
That's the driving distance. It would take 1 day to go from Rapid City, South Dakota to Petaluma, California.
The flight distance (direct flight from Rapid City, SD to Petaluma, CA) is 1,084.09 mi.
1,388 mi = 2,233.60 kms