| Idstein to Karlovo | 942.21 mi (1,516.34 km) |
| Idstein to Karnobat | 1,029.56 mi (1,656.92 km) |
| Idstein to Kavarna | 1,053.38 mi (1,695.25 km) |
| Idstein to Kazanlak | 966.76 mi (1,555.85 km) |
| Idstein to Knezha | 876.79 mi (1,411.05 km) |
| Idstein to Kostinbrod | 872.84 mi (1,404.70 km) |
| Idstein to Kozloduy | 851.01 mi (1,369.57 km) |
| Idstein to Kyustendil | 877.58 mi (1,412.32 km) |
| Idstein to Levski | 924.37 mi (1,487.64 km) |
| Idstein to Lom | 829.55 mi (1,335.03 km) |
| Idstein to Lovech | 917.44 mi (1,476.47 km) |
| Idstein to Lukovit | 892.84 mi (1,436.89 km) |
| Idstein to Lyaskovets | 958.93 mi (1,543.24 km) |
| Idstein to Mezdra | 876.68 mi (1,410.88 km) |
| Idstein to Momchilgrad | 1,015.96 mi (1,635.03 km) |
