| Paducah to Smolyan | 5,567.82 mi (8,960.55 km) |
| Paducah to Sofia | 5,464.12 mi (8,793.65 km) |
| Paducah to Sopot | 5,520.42 mi (8,884.25 km) |
| Paducah to Sozopol | 5,641.52 mi (9,079.14 km) |
| Paducah to Sredets | 5,626.21 mi (9,054.51 km) |
| Paducah to Stamboliyski | 5,536.03 mi (8,909.39 km) |
| Paducah to Stara Zagora | 5,564.41 mi (8,955.05 km) |
| Paducah to Svilengrad | 5,616.36 mi (9,038.66 km) |
| Paducah to Svishtov | 5,498.14 mi (8,848.40 km) |
| Paducah to Targovishte | 5,560.85 mi (8,949.33 km) |
| Paducah to Teteven | 5,489.86 mi (8,835.08 km) |
| Paducah to Troyan | 5,508.39 mi (8,864.90 km) |
| Paducah to Tryavna | 5,538.57 mi (8,913.46 km) |
| Paducah to Tutrakan | 5,524.44 mi (8,890.72 km) |
| Paducah to Varna | 5,611.23 mi (9,030.40 km) |
