| Siegen to Karlovo | 973.89 mi (1,567.32 km) |
| Siegen to Karnobat | 1,058.72 mi (1,703.84 km) |
| Siegen to Kavarna | 1,079.42 mi (1,737.15 km) |
| Siegen to Kazanlak | 997.78 mi (1,605.77 km) |
| Siegen to Knezha | 907.61 mi (1,460.65 km) |
| Siegen to Kostinbrod | 906.17 mi (1,458.35 km) |
| Siegen to Kozloduy | 881.65 mi (1,418.88 km) |
| Siegen to Kyustendil | 912.58 mi (1,468.65 km) |
| Siegen to Levski | 954.18 mi (1,535.61 km) |
| Siegen to Lom | 860.73 mi (1,385.21 km) |
| Siegen to Lovech | 948.24 mi (1,526.05 km) |
| Siegen to Lukovit | 924.19 mi (1,487.35 km) |
| Siegen to Lyaskovets | 988.60 mi (1,591.00 km) |
| Siegen to Mezdra | 908.73 mi (1,462.46 km) |
| Siegen to Momchilgrad | 1,048.91 mi (1,688.06 km) |
