| San Felice Circeo to Smolyan | 601.37 mi (967.81 km) |
| San Felice Circeo to Sofia | 535.06 mi (861.10 km) |
| San Felice Circeo to Sopot | 606.37 mi (975.85 km) |
| San Felice Circeo to Sozopol | 755.40 mi (1,215.70 km) |
| San Felice Circeo to Sredets | 729.78 mi (1,174.47 km) |
| San Felice Circeo to Stamboliyski | 592.99 mi (954.32 km) |
| San Felice Circeo to Stara Zagora | 650.97 mi (1,047.63 km) |
| San Felice Circeo to Svilengrad | 678.45 mi (1,091.86 km) |
| San Felice Circeo to Svishtov | 645.61 mi (1,039.00 km) |
| San Felice Circeo to Targovishte | 702.97 mi (1,131.32 km) |
| San Felice Circeo to Teteven | 584.10 mi (940.02 km) |
| San Felice Circeo to Troyan | 606.40 mi (975.91 km) |
| San Felice Circeo to Tryavna | 645.69 mi (1,039.14 km) |
| San Felice Circeo to Tutrakan | 713.25 mi (1,147.87 km) |
| San Felice Circeo to Varna | 769.49 mi (1,238.37 km) |
