| Cologne to Karlovo | 1,016.44 mi (1,635.80 km) |
| Cologne to Karnobat | 1,102.45 mi (1,774.22 km) |
| Cologne to Kavarna | 1,124.26 mi (1,809.32 km) |
| Cologne to Kazanlak | 1,040.66 mi (1,674.78 km) |
| Cologne to Knezha | 950.57 mi (1,529.80 km) |
| Cologne to Kostinbrod | 947.79 mi (1,525.32 km) |
| Cologne to Kozloduy | 924.70 mi (1,488.15 km) |
| Cologne to Kyustendil | 953.13 mi (1,533.91 km) |
| Cologne to Levski | 997.62 mi (1,605.51 km) |
| Cologne to Lom | 903.51 mi (1,454.06 km) |
| Cologne to Lovech | 991.22 mi (1,595.22 km) |
| Cologne to Lukovit | 966.90 mi (1,556.08 km) |
| Cologne to Lyaskovets | 1,032.10 mi (1,661.01 km) |
| Cologne to Mezdra | 951.07 mi (1,530.61 km) |
| Cologne to Momchilgrad | 1,090.77 mi (1,755.43 km) |
