| Sumter to Smolyan | 5,384.98 mi (8,666.30 km) |
| Sumter to Sofia | 5,283.44 mi (8,502.87 km) |
| Sumter to Sopot | 5,344.89 mi (8,601.77 km) |
| Sumter to Sozopol | 5,476.23 mi (8,813.14 km) |
| Sumter to Sredets | 5,458.45 mi (8,784.52 km) |
| Sumter to Stamboliyski | 5,356.20 mi (8,619.98 km) |
| Sumter to Stara Zagora | 5,390.98 mi (8,675.94 km) |
| Sumter to Svilengrad | 5,440.72 mi (8,756.00 km) |
| Sumter to Svishtov | 5,331.45 mi (8,580.14 km) |
| Sumter to Targovishte | 5,396.56 mi (8,684.93 km) |
| Sumter to Teteven | 5,314.25 mi (8,552.46 km) |
| Sumter to Troyan | 5,334.30 mi (8,584.73 km) |
| Sumter to Tryavna | 5,367.44 mi (8,638.06 km) |
| Sumter to Tutrakan | 5,365.62 mi (8,635.13 km) |
| Sumter to Varna | 5,452.07 mi (8,774.27 km) |
