| Castelletto sopra Ticino to Smolyan | 850.70 mi (1,369.06 km) |
| Castelletto sopra Ticino to Sofia | 755.89 mi (1,216.48 km) |
| Castelletto sopra Ticino to Sopot | 824.59 mi (1,327.04 km) |
| Castelletto sopra Ticino to Sozopol | 971.10 mi (1,562.84 km) |
| Castelletto sopra Ticino to Sredets | 948.77 mi (1,526.90 km) |
| Castelletto sopra Ticino to Stamboliyski | 827.45 mi (1,331.65 km) |
| Castelletto sopra Ticino to Stara Zagora | 872.74 mi (1,404.54 km) |
| Castelletto sopra Ticino to Svilengrad | 916.18 mi (1,474.44 km) |
| Castelletto sopra Ticino to Svishtov | 832.57 mi (1,339.89 km) |
| Castelletto sopra Ticino to Targovishte | 899.09 mi (1,446.95 km) |
| Castelletto sopra Ticino to Teteven | 795.26 mi (1,279.85 km) |
| Castelletto sopra Ticino to Troyan | 817.51 mi (1,315.66 km) |
| Castelletto sopra Ticino to Tryavna | 855.33 mi (1,376.53 km) |
| Castelletto sopra Ticino to Tutrakan | 885.98 mi (1,425.84 km) |
| Castelletto sopra Ticino to Varna | 963.94 mi (1,551.31 km) |
