| Castelfidardo to Smolyan | 582.16 mi (936.90 km) |
| Castelfidardo to Sofia | 496.26 mi (798.65 km) |
| Castelfidardo to Sopot | 567.98 mi (914.08 km) |
| Castelfidardo to Sozopol | 718.68 mi (1,156.61 km) |
| Castelfidardo to Sredets | 694.48 mi (1,117.65 km) |
| Castelfidardo to Stamboliyski | 564.12 mi (907.87 km) |
| Castelfidardo to Stara Zagora | 615.71 mi (990.90 km) |
| Castelfidardo to Svilengrad | 653.34 mi (1,051.45 km) |
| Castelfidardo to Svishtov | 590.79 mi (950.79 km) |
| Castelfidardo to Targovishte | 654.45 mi (1,053.23 km) |
| Castelfidardo to Teteven | 540.99 mi (870.65 km) |
| Castelfidardo to Troyan | 563.87 mi (907.47 km) |
| Castelfidardo to Tryavna | 603.31 mi (970.94 km) |
| Castelfidardo to Tutrakan | 652.85 mi (1,050.66 km) |
| Castelfidardo to Varna | 721.44 mi (1,161.05 km) |
