| Bad Honnef am Rhein to Karlovo | 996.60 mi (1,603.87 km) |
| Bad Honnef am Rhein to Karnobat | 1,083.49 mi (1,743.70 km) |
| Bad Honnef am Rhein to Kavarna | 1,106.43 mi (1,780.62 km) |
| Bad Honnef am Rhein to Kazanlak | 1,021.05 mi (1,643.22 km) |
| Bad Honnef am Rhein to Knezha | 931.04 mi (1,498.36 km) |
| Bad Honnef am Rhein to Kostinbrod | 927.41 mi (1,492.52 km) |
| Bad Honnef am Rhein to Kozloduy | 905.23 mi (1,456.82 km) |
| Bad Honnef am Rhein to Kyustendil | 932.21 mi (1,500.24 km) |
| Bad Honnef am Rhein to Levski | 978.43 mi (1,574.63 km) |
| Bad Honnef am Rhein to Lom | 883.85 mi (1,422.42 km) |
| Bad Honnef am Rhein to Lovech | 971.69 mi (1,563.78 km) |
| Bad Honnef am Rhein to Lukovit | 947.18 mi (1,524.34 km) |
| Bad Honnef am Rhein to Lyaskovets | 1,012.96 mi (1,630.20 km) |
| Bad Honnef am Rhein to Mezdra | 931.12 mi (1,498.49 km) |
| Bad Honnef am Rhein to Momchilgrad | 1,070.50 mi (1,722.81 km) |
