| Rapid City to Smolyan | 5,696.82 mi (9,168.14 km) |
| Rapid City to Sofia | 5,593.29 mi (9,001.53 km) |
| Rapid City to Sopot | 5,637.84 mi (9,073.22 km) |
| Rapid City to Sozopol | 5,735.27 mi (9,230.03 km) |
| Rapid City to Sredets | 5,725.11 mi (9,213.68 km) |
| Rapid City to Stamboliyski | 5,660.75 mi (9,110.10 km) |
| Rapid City to Stara Zagora | 5,676.20 mi (9,134.97 km) |
| Rapid City to Svilengrad | 5,730.15 mi (9,221.78 km) |
| Rapid City to Svishtov | 5,600.25 mi (9,012.73 km) |
| Rapid City to Targovishte | 5,656.03 mi (9,102.50 km) |
| Rapid City to Teteven | 5,608.67 mi (9,026.28 km) |
| Rapid City to Troyan | 5,623.66 mi (9,050.40 km) |
| Rapid City to Tryavna | 5,647.19 mi (9,088.27 km) |
| Rapid City to Tutrakan | 5,611.09 mi (9,030.17 km) |
| Rapid City to Varna | 5,694.98 mi (9,165.19 km) |
