There are
1,383 mi
from Rapid City, SD to Sulphur, LA
That's the driving distance. It would take 1 day 1 hour to go from Rapid City, South Dakota to Sulphur, Louisiana.
The flight distance (direct flight from Rapid City, SD to Sulphur, LA) is 1,097.80 mi.
1,383 mi = 2,225.40 kms