| Castano Primo to Smolyan | 841.72 mi (1,354.62 km) |
| Castano Primo to Sofia | 747.47 mi (1,202.93 km) |
| Castano Primo to Sopot | 816.45 mi (1,313.95 km) |
| Castano Primo to Sozopol | 963.40 mi (1,550.44 km) |
| Castano Primo to Sredets | 940.92 mi (1,514.26 km) |
| Castano Primo to Stamboliyski | 818.85 mi (1,317.81 km) |
| Castano Primo to Stara Zagora | 864.63 mi (1,391.48 km) |
| Castano Primo to Svilengrad | 907.69 mi (1,460.79 km) |
| Castano Primo to Svishtov | 825.39 mi (1,328.34 km) |
| Castano Primo to Targovishte | 891.82 mi (1,435.25 km) |
| Castano Primo to Teteven | 787.25 mi (1,266.95 km) |
| Castano Primo to Troyan | 809.57 mi (1,302.87 km) |
| Castano Primo to Tryavna | 847.54 mi (1,363.98 km) |
| Castano Primo to Tutrakan | 879.39 mi (1,415.24 km) |
| Castano Primo to Varna | 956.87 mi (1,539.94 km) |
