| Unterwellenborn to Karlovo | 839.45 mi (1,350.96 km) |
| Unterwellenborn to Karnobat | 919.37 mi (1,479.58 km) |
| Unterwellenborn to Kavarna | 935.66 mi (1,505.80 km) |
| Unterwellenborn to Kazanlak | 861.93 mi (1,387.14 km) |
| Unterwellenborn to Knezha | 771.75 mi (1,242.01 km) |
| Unterwellenborn to Kostinbrod | 775.72 mi (1,248.40 km) |
| Unterwellenborn to Kozloduy | 745.56 mi (1,199.86 km) |
| Unterwellenborn to Kyustendil | 786.34 mi (1,265.49 km) |
| Unterwellenborn to Levski | 816.28 mi (1,313.67 km) |
| Unterwellenborn to Lom | 725.82 mi (1,168.10 km) |
| Unterwellenborn to Lovech | 812.18 mi (1,307.08 km) |
| Unterwellenborn to Lukovit | 789.31 mi (1,270.27 km) |
| Unterwellenborn to Lyaskovets | 850.34 mi (1,368.49 km) |
| Unterwellenborn to Mezdra | 775.36 mi (1,247.82 km) |
| Unterwellenborn to Momchilgrad | 916.89 mi (1,475.58 km) |
