| Siegburg to Karlovo | 1,002.41 mi (1,613.22 km) |
| Siegburg to Karnobat | 1,088.67 mi (1,752.04 km) |
| Siegburg to Kavarna | 1,110.84 mi (1,787.73 km) |
| Siegburg to Kazanlak | 1,026.69 mi (1,652.30 km) |
| Siegburg to Knezha | 936.62 mi (1,507.34 km) |
| Siegburg to Kostinbrod | 933.63 mi (1,502.53 km) |
| Siegburg to Kozloduy | 910.76 mi (1,465.73 km) |
| Siegburg to Kyustendil | 938.85 mi (1,510.94 km) |
| Siegburg to Levski | 983.77 mi (1,583.22 km) |
| Siegburg to Lom | 889.52 mi (1,431.55 km) |
| Siegburg to Lovech | 977.27 mi (1,572.76 km) |
| Siegburg to Lukovit | 952.90 mi (1,533.54 km) |
| Siegburg to Lyaskovets | 1,018.26 mi (1,638.74 km) |
| Siegburg to Mezdra | 937.01 mi (1,507.97 km) |
| Siegburg to Momchilgrad | 1,076.64 mi (1,732.68 km) |
