| Ferentino to Smolyan | 590.90 mi (950.96 km) |
| Ferentino to Sofia | 520.45 mi (837.58 km) |
| Ferentino to Sopot | 592.24 mi (953.12 km) |
| Ferentino to Sozopol | 742.20 mi (1,194.46 km) |
| Ferentino to Sredets | 716.77 mi (1,153.52 km) |
| Ferentino to Stamboliyski | 580.60 mi (934.38 km) |
| Ferentino to Stara Zagora | 637.65 mi (1,026.19 km) |
| Ferentino to Svilengrad | 667.19 mi (1,073.75 km) |
| Ferentino to Svishtov | 628.63 mi (1,011.69 km) |
| Ferentino to Targovishte | 687.37 mi (1,106.22 km) |
| Ferentino to Teteven | 568.98 mi (915.68 km) |
| Ferentino to Troyan | 591.50 mi (951.93 km) |
| Ferentino to Tryavna | 631.01 mi (1,015.51 km) |
| Ferentino to Tutrakan | 695.52 mi (1,119.33 km) |
| Ferentino to Varna | 754.20 mi (1,213.77 km) |
