| Olen to Sofia | 1,044.83 mi (1,681.49 km) |
| Olen to Sopot | 1,102.55 mi (1,774.38 km) |
| Olen to Sozopol | 1,230.71 mi (1,980.63 km) |
| Olen to Sredets | 1,213.26 mi (1,952.56 km) |
| Olen to Stamboliyski | 1,116.93 mi (1,797.52 km) |
| Olen to Stara Zagora | 1,147.60 mi (1,846.88 km) |
| Olen to Svilengrad | 1,198.62 mi (1,929.00 km) |
| Olen to Svishtov | 1,085.97 mi (1,747.70 km) |
| Olen to Targovishte | 1,150.97 mi (1,852.30 km) |
| Olen to Teteven | 1,071.90 mi (1,725.06 km) |
| Olen to Troyan | 1,091.14 mi (1,756.02 km) |
| Olen to Tryavna | 1,123.05 mi (1,807.37 km) |
| Olen to Tutrakan | 1,120.82 mi (1,803.79 km) |
| Olen to Varna | 1,206.98 mi (1,942.45 km) |
| Olen to Veliki Preslav | 1,163.87 mi (1,873.07 km) |
