| Sion to Smolyan | 918.37 mi (1,477.97 km) |
| Sion to Sofia | 822.46 mi (1,323.62 km) |
| Sion to Sopot | 890.47 mi (1,433.07 km) |
| Sion to Sozopol | 1,035.86 mi (1,667.06 km) |
| Sion to Sredets | 1,013.91 mi (1,631.73 km) |
| Sion to Stamboliyski | 894.37 mi (1,439.34 km) |
| Sion to Stara Zagora | 938.54 mi (1,510.43 km) |
| Sion to Svilengrad | 982.81 mi (1,581.68 km) |
| Sion to Svishtov | 896.06 mi (1,442.07 km) |
| Sion to Targovishte | 962.78 mi (1,549.44 km) |
| Sion to Teteven | 860.89 mi (1,385.46 km) |
| Sion to Troyan | 882.96 mi (1,420.98 km) |
| Sion to Tryavna | 920.39 mi (1,481.22 km) |
| Sion to Tutrakan | 947.78 mi (1,525.31 km) |
| Sion to Varna | 1,027.02 mi (1,652.83 km) |
