| Pottstown to Smolyan | 4,902.42 mi (7,889.68 km) |
| Pottstown to Sofia | 4,799.97 mi (7,724.80 km) |
| Pottstown to Sopot | 4,859.82 mi (7,821.13 km) |
| Pottstown to Sozopol | 4,988.18 mi (8,027.70 km) |
| Pottstown to Sredets | 4,971.12 mi (8,000.25 km) |
| Pottstown to Stamboliyski | 4,872.57 mi (7,841.65 km) |
| Pottstown to Stara Zagora | 4,905.31 mi (7,894.34 km) |
| Pottstown to Svilengrad | 4,955.85 mi (7,975.68 km) |
| Pottstown to Svishtov | 4,843.59 mi (7,795.01 km) |
| Pottstown to Targovishte | 4,908.09 mi (7,898.81 km) |
| Pottstown to Teteven | 4,829.16 mi (7,771.78 km) |
| Pottstown to Troyan | 4,848.75 mi (7,803.31 km) |
| Pottstown to Tryavna | 4,881.01 mi (7,855.22 km) |
| Pottstown to Tutrakan | 4,875.50 mi (7,846.37 km) |
| Pottstown to Varna | 4,962.20 mi (7,985.88 km) |
