| Aiken to Smolyan | 5,460.47 mi (8,787.77 km) |
| Aiken to Sofia | 5,358.73 mi (8,624.04 km) |
| Aiken to Sopot | 5,419.87 mi (8,722.43 km) |
| Aiken to Sozopol | 5,550.56 mi (8,932.77 km) |
| Aiken to Sredets | 5,532.94 mi (8,904.41 km) |
| Aiken to Stamboliyski | 5,431.47 mi (8,741.11 km) |
| Aiken to Stara Zagora | 5,465.83 mi (8,796.41 km) |
| Aiken to Svilengrad | 5,515.75 mi (8,876.75 km) |
| Aiken to Svishtov | 5,405.81 mi (8,699.81 km) |
| Aiken to Targovishte | 5,470.78 mi (8,804.38 km) |
| Aiken to Teteven | 5,389.22 mi (8,673.11 km) |
| Aiken to Troyan | 5,409.18 mi (8,705.23 km) |
| Aiken to Tryavna | 5,442.12 mi (8,758.25 km) |
| Aiken to Tutrakan | 5,439.43 mi (8,753.92 km) |
| Aiken to Varna | 5,525.96 mi (8,893.17 km) |
