| Rapid City to Popovo | 5,640.46 mi (9,077.44 km) |
| Rapid City to Provadia | 5,683.57 mi (9,146.82 km) |
| Rapid City to Radnevo | 5,691.96 mi (9,160.33 km) |
| Rapid City to Radomir | 5,590.37 mi (8,996.83 km) |
| Rapid City to Rakitovo | 5,655.94 mi (9,102.36 km) |
| Rapid City to Rakovski | 5,664.62 mi (9,116.32 km) |
| Rapid City to Razgrad | 5,637.92 mi (9,073.36 km) |
| Rapid City to Razlog | 5,643.20 mi (9,081.85 km) |
| Rapid City to Ruse | 5,605.57 mi (9,021.29 km) |
| Rapid City to Samokov | 5,620.35 mi (9,045.08 km) |
| Rapid City to Sandanski | 5,655.35 mi (9,101.41 km) |
| Rapid City to Sevlievo | 5,627.05 mi (9,055.86 km) |
| Rapid City to Shumen | 5,663.91 mi (9,115.18 km) |
| Rapid City to Silistra | 5,624.98 mi (9,052.53 km) |
| Rapid City to Sliven | 5,681.46 mi (9,143.42 km) |
