| Norristown to Smolyan | 4,895.45 mi (7,878.46 km) |
| Norristown to Sofia | 4,793.09 mi (7,713.73 km) |
| Norristown to Sopot | 4,853.13 mi (7,810.35 km) |
| Norristown to Sozopol | 4,981.85 mi (8,017.51 km) |
| Norristown to Sredets | 4,964.70 mi (7,989.91 km) |
| Norristown to Stamboliyski | 4,865.71 mi (7,830.61 km) |
| Norristown to Stara Zagora | 4,898.69 mi (7,883.68 km) |
| Norristown to Svilengrad | 4,949.14 mi (7,964.87 km) |
| Norristown to Svishtov | 4,837.22 mi (7,784.76 km) |
| Norristown to Targovishte | 4,901.80 mi (7,888.69 km) |
| Norristown to Teteven | 4,822.46 mi (7,761.01 km) |
| Norristown to Troyan | 4,842.11 mi (7,792.62 km) |
| Norristown to Tryavna | 4,874.47 mi (7,844.70 km) |
| Norristown to Tutrakan | 4,869.43 mi (7,836.58 km) |
| Norristown to Varna | 4,956.09 mi (7,976.06 km) |
