| Hennef to Karlovo | 998.77 mi (1,607.37 km) |
| Hennef to Karnobat | 1,085.01 mi (1,746.15 km) |
| Hennef to Kavarna | 1,107.18 mi (1,781.83 km) |
| Hennef to Kazanlak | 1,023.05 mi (1,646.44 km) |
| Hennef to Knezha | 932.97 mi (1,501.48 km) |
| Hennef to Kostinbrod | 930.02 mi (1,496.72 km) |
| Hennef to Kozloduy | 907.11 mi (1,459.86 km) |
| Hennef to Kyustendil | 935.28 mi (1,505.19 km) |
| Hennef to Levski | 980.11 mi (1,577.34 km) |
| Hennef to Lom | 885.88 mi (1,425.69 km) |
| Hennef to Lovech | 973.62 mi (1,566.90 km) |
| Hennef to Lukovit | 949.26 mi (1,527.69 km) |
| Hennef to Lyaskovets | 1,014.61 mi (1,632.85 km) |
| Hennef to Mezdra | 933.38 mi (1,502.13 km) |
| Hennef to Momchilgrad | 1,073.02 mi (1,726.86 km) |
