| Olen to Karnobat | 1,192.59 mi (1,919.29 km) |
| Olen to Kavarna | 1,215.71 mi (1,956.49 km) |
| Olen to Kazanlak | 1,129.74 mi (1,818.14 km) |
| Olen to Knezha | 1,039.80 mi (1,673.40 km) |
| Olen to Kostinbrod | 1,035.23 mi (1,666.04 km) |
| Olen to Kozloduy | 1,014.04 mi (1,631.95 km) |
| Olen to Kyustendil | 1,039.07 mi (1,672.22 km) |
| Olen to Levski | 1,087.43 mi (1,750.04 km) |
| Olen to Lom | 992.52 mi (1,597.31 km) |
| Olen to Lovech | 1,080.45 mi (1,738.81 km) |
| Olen to Lukovit | 1,055.78 mi (1,699.12 km) |
| Olen to Lyaskovets | 1,121.98 mi (1,805.65 km) |
| Olen to Mezdra | 1,039.49 mi (1,672.90 km) |
| Olen to Momchilgrad | 1,178.45 mi (1,896.53 km) |
| Olen to Montana | 1,009.59 mi (1,624.77 km) |
