| Idar-Oberstein to Karlovo | 965.58 mi (1,553.95 km) |
| Idar-Oberstein to Karnobat | 1,056.22 mi (1,699.82 km) |
| Idar-Oberstein to Kavarna | 1,083.84 mi (1,744.28 km) |
| Idar-Oberstein to Kazanlak | 991.01 mi (1,594.88 km) |
| Idar-Oberstein to Knezha | 901.54 mi (1,450.90 km) |
| Idar-Oberstein to Kostinbrod | 893.93 mi (1,438.64 km) |
| Idar-Oberstein to Kozloduy | 876.10 mi (1,409.94 km) |
| Idar-Oberstein to Kyustendil | 895.97 mi (1,441.93 km) |
| Idar-Oberstein to Levski | 950.39 mi (1,529.50 km) |
| Idar-Oberstein to Lom | 853.93 mi (1,374.27 km) |
| Idar-Oberstein to Lovech | 942.11 mi (1,516.17 km) |
| Idar-Oberstein to Lukovit | 916.80 mi (1,475.45 km) |
| Idar-Oberstein to Lyaskovets | 985.04 mi (1,585.27 km) |
| Idar-Oberstein to Mezdra | 899.69 mi (1,447.91 km) |
| Idar-Oberstein to Momchilgrad | 1,037.28 mi (1,669.34 km) |
