There are
1,663 mi
from Rapid City, SD to Wilmington, DE
That's the driving distance. It would take 1 day 5 hours to go from Rapid City, South Dakota to Wilmington, Delaware.
The flight distance (direct flight from Rapid City, SD to Wilmington, DE) is 1,447.34 mi.
1,663 mi = 2,676.40 kms