| Castrop-Rauxel to Karlovo | 1,023.02 mi (1,646.39 km) |
| Castrop-Rauxel to Karnobat | 1,105.97 mi (1,779.89 km) |
| Castrop-Rauxel to Kavarna | 1,124.27 mi (1,809.34 km) |
| Castrop-Rauxel to Kazanlak | 1,046.43 mi (1,684.07 km) |
| Castrop-Rauxel to Knezha | 956.20 mi (1,538.85 km) |
| Castrop-Rauxel to Kostinbrod | 956.46 mi (1,539.28 km) |
| Castrop-Rauxel to Kozloduy | 930.14 mi (1,496.91 km) |
| Castrop-Rauxel to Kyustendil | 963.91 mi (1,551.27 km) |
| Castrop-Rauxel to Levski | 1,002.01 mi (1,612.58 km) |
| Castrop-Rauxel to Lom | 909.62 mi (1,463.89 km) |
| Castrop-Rauxel to Lovech | 996.79 mi (1,604.17 km) |
| Castrop-Rauxel to Lukovit | 973.14 mi (1,566.12 km) |
| Castrop-Rauxel to Lyaskovets | 1,036.30 mi (1,667.77 km) |
| Castrop-Rauxel to Mezdra | 958.17 mi (1,542.02 km) |
| Castrop-Rauxel to Momchilgrad | 1,098.85 mi (1,768.43 km) |
