| Castrolibero to Smolyan | 473.31 mi (761.72 km) |
| Castrolibero to Sofia | 438.90 mi (706.34 km) |
| Castrolibero to Sopot | 501.57 mi (807.21 km) |
| Castrolibero to Sozopol | 637.28 mi (1,025.61 km) |
| Castrolibero to Sredets | 611.49 mi (984.10 km) |
| Castrolibero to Stamboliyski | 477.50 mi (768.46 km) |
| Castrolibero to Stara Zagora | 538.22 mi (866.19 km) |
| Castrolibero to Svilengrad | 551.29 mi (887.21 km) |
| Castrolibero to Svishtov | 558.69 mi (899.12 km) |
| Castrolibero to Targovishte | 603.13 mi (970.65 km) |
| Castrolibero to Teteven | 487.71 mi (784.90 km) |
| Castrolibero to Troyan | 506.95 mi (815.85 km) |
| Castrolibero to Tryavna | 542.42 mi (872.95 km) |
| Castrolibero to Tutrakan | 628.46 mi (1,011.41 km) |
| Castrolibero to Varna | 664.71 mi (1,069.75 km) |
