| Frosinone to Smolyan | 585.94 mi (942.98 km) |
| Frosinone to Sofia | 516.07 mi (830.53 km) |
| Frosinone to Sopot | 587.80 mi (945.96 km) |
| Frosinone to Sozopol | 737.63 mi (1,187.11 km) |
| Frosinone to Sredets | 712.17 mi (1,146.13 km) |
| Frosinone to Stamboliyski | 575.90 mi (926.82 km) |
| Frosinone to Stara Zagora | 633.08 mi (1,018.85 km) |
| Frosinone to Svilengrad | 662.35 mi (1,065.95 km) |
| Frosinone to Svishtov | 624.66 mi (1,005.30 km) |
| Frosinone to Targovishte | 683.18 mi (1,099.47 km) |
| Frosinone to Teteven | 564.69 mi (908.77 km) |
| Frosinone to Troyan | 587.18 mi (944.97 km) |
| Frosinone to Tryavna | 626.65 mi (1,008.50 km) |
| Frosinone to Tutrakan | 691.70 mi (1,113.18 km) |
| Frosinone to Varna | 749.96 mi (1,206.94 km) |
