There are
1,495 mi
from Rapid City, SD to Brownsville, TX
That's the driving distance. It would take 1 day 4 hours to go from Rapid City, South Dakota to Brownsville, Texas.
The flight distance (direct flight from Rapid City, SD to Brownsville, TX) is 1,296.43 mi.
1,495 mi = 2,405.95 kms