| Clausthal-Zellerfeld to Karlovo | 925.23 mi (1,489.01 km) |
| Clausthal-Zellerfeld to Karnobat | 1,001.86 mi (1,612.34 km) |
| Clausthal-Zellerfeld to Kavarna | 1,014.03 mi (1,631.92 km) |
| Clausthal-Zellerfeld to Kazanlak | 946.88 mi (1,523.85 km) |
| Clausthal-Zellerfeld to Knezha | 856.92 mi (1,379.07 km) |
| Clausthal-Zellerfeld to Kostinbrod | 863.48 mi (1,389.64 km) |
| Clausthal-Zellerfeld to Kozloduy | 830.67 mi (1,336.83 km) |
| Clausthal-Zellerfeld to Kyustendil | 875.57 mi (1,409.09 km) |
| Clausthal-Zellerfeld to Levski | 900.05 mi (1,448.49 km) |
| Clausthal-Zellerfeld to Lom | 811.65 mi (1,306.22 km) |
| Clausthal-Zellerfeld to Lovech | 897.12 mi (1,443.78 km) |
| Clausthal-Zellerfeld to Lukovit | 874.98 mi (1,408.14 km) |
| Clausthal-Zellerfeld to Lyaskovets | 933.78 mi (1,502.77 km) |
| Clausthal-Zellerfeld to Mezdra | 861.84 mi (1,386.99 km) |
| Clausthal-Zellerfeld to Momchilgrad | 1,003.69 mi (1,615.28 km) |
