| Rapid City to Karlovo | 5,639.86 mi (9,076.48 km) |
| Rapid City to Karnobat | 5,702.70 mi (9,177.61 km) |
| Rapid City to Kavarna | 5,693.82 mi (9,163.32 km) |
| Rapid City to Kazanlak | 5,658.55 mi (9,106.56 km) |
| Rapid City to Knezha | 5,570.45 mi (8,964.77 km) |
| Rapid City to Kostinbrod | 5,583.39 mi (8,985.59 km) |
| Rapid City to Kozloduy | 5,544.35 mi (8,922.77 km) |
| Rapid City to Kyustendil | 5,597.27 mi (9,007.93 km) |
| Rapid City to Levski | 5,608.26 mi (9,025.62 km) |
| Rapid City to Lom | 5,527.52 mi (8,895.69 km) |
| Rapid City to Lovech | 5,609.44 mi (9,027.52 km) |
| Rapid City to Lukovit | 5,589.78 mi (8,995.87 km) |
| Rapid City to Lyaskovets | 5,640.10 mi (9,076.86 km) |
| Rapid City to Mezdra | 5,578.95 mi (8,978.45 km) |
| Rapid City to Momchilgrad | 5,720.73 mi (9,206.63 km) |
