| Rapid City to Smyrna (Delaware) | 1,455.20 mi (2,341.92 km) |
| Rapid City to Smyrna (Georgia) | 1,222.92 mi (1,968.10 km) |
| Rapid City to Smyrna (Tennessee) | 1,042.77 mi (1,678.17 km) |
| Rapid City to Snellville (Georgia) | 1,245.64 mi (2,004.66 km) |
| Rapid City to Snoqualmie (Washington) | 925.70 mi (1,489.77 km) |
| Rapid City to Snyder (Texas) | 794.59 mi (1,278.76 km) |
| Rapid City to Socastee (South Carolina) | 1,478.84 mi (2,379.97 km) |
| Rapid City to Socorro (Texas) | 874.74 mi (1,407.76 km) |
| Rapid City to Soddy-Daisy (Tennessee) | 1,132.93 mi (1,823.28 km) |
| Rapid City to Solana Beach (California) | 1,074.73 mi (1,729.61 km) |
| Rapid City to Soledad (California) | 1,087.86 mi (1,750.74 km) |
| Rapid City to Solon (Ohio) | 1,117.50 mi (1,798.44 km) |
| Rapid City to Somers Point (New Jersey) | 1,504.26 mi (2,420.87 km) |
| Rapid City to Somerset (Kentucky) | 1,086.05 mi (1,747.84 km) |
| Rapid City to Somerset (New Jersey) | 1,480.64 mi (2,382.86 km) |
