| Poplar Bluff to Smolyan | 5,650.69 mi (9,093.90 km) |
| Poplar Bluff to Sofia | 5,546.83 mi (8,926.76 km) |
| Poplar Bluff to Sopot | 5,602.47 mi (9,016.30 km) |
| Poplar Bluff to Sozopol | 5,722.21 mi (9,209.01 km) |
| Poplar Bluff to Sredets | 5,707.22 mi (9,184.88 km) |
| Poplar Bluff to Stamboliyski | 5,618.58 mi (9,042.22 km) |
| Poplar Bluff to Stara Zagora | 5,646.16 mi (9,086.62 km) |
| Poplar Bluff to Svilengrad | 5,698.33 mi (9,170.57 km) |
| Poplar Bluff to Svishtov | 5,579.15 mi (8,978.78 km) |
| Poplar Bluff to Targovishte | 5,641.51 mi (9,079.13 km) |
| Poplar Bluff to Teteven | 5,571.95 mi (8,967.19 km) |
| Poplar Bluff to Troyan | 5,590.28 mi (8,996.69 km) |
| Poplar Bluff to Tryavna | 5,620.07 mi (9,044.64 km) |
| Poplar Bluff to Tutrakan | 5,604.46 mi (9,019.51 km) |
| Poplar Bluff to Varna | 5,691.21 mi (9,159.11 km) |
