| Grefrath to Karlovo | 1,052.72 mi (1,694.19 km) |
| Grefrath to Karnobat | 1,137.85 mi (1,831.19 km) |
| Grefrath to Kavarna | 1,158.44 mi (1,864.32 km) |
| Grefrath to Kazanlak | 1,076.73 mi (1,732.82 km) |
| Grefrath to Knezha | 986.58 mi (1,587.74 km) |
| Grefrath to Kostinbrod | 984.59 mi (1,584.55 km) |
| Grefrath to Kozloduy | 960.64 mi (1,546.00 km) |
| Grefrath to Kyustendil | 990.39 mi (1,593.88 km) |
| Grefrath to Levski | 1,033.27 mi (1,662.88 km) |
| Grefrath to Lom | 939.64 mi (1,512.20 km) |
| Grefrath to Lovech | 1,027.22 mi (1,653.15 km) |
| Grefrath to Lukovit | 1,003.08 mi (1,614.30 km) |
| Grefrath to Lyaskovets | 1,067.70 mi (1,718.29 km) |
| Grefrath to Mezdra | 987.48 mi (1,589.20 km) |
| Grefrath to Momchilgrad | 1,127.46 mi (1,814.46 km) |
