| Drexel Hill to Smolyan | 4,901.45 mi (7,888.12 km) |
| Drexel Hill to Sofia | 4,799.15 mi (7,723.48 km) |
| Drexel Hill to Sopot | 4,859.30 mi (7,820.28 km) |
| Drexel Hill to Sozopol | 4,988.24 mi (8,027.80 km) |
| Drexel Hill to Sredets | 4,971.04 mi (8,000.11 km) |
| Drexel Hill to Stamboliyski | 4,871.79 mi (7,840.39 km) |
| Drexel Hill to Stara Zagora | 4,904.90 mi (7,893.68 km) |
| Drexel Hill to Svilengrad | 4,955.30 mi (7,974.79 km) |
| Drexel Hill to Svishtov | 4,843.60 mi (7,795.01 km) |
| Drexel Hill to Targovishte | 4,908.22 mi (7,899.02 km) |
| Drexel Hill to Teteven | 4,828.64 mi (7,770.94 km) |
| Drexel Hill to Troyan | 4,848.32 mi (7,802.61 km) |
| Drexel Hill to Tryavna | 4,880.74 mi (7,854.79 km) |
| Drexel Hill to Tutrakan | 4,875.97 mi (7,847.11 km) |
| Drexel Hill to Varna | 4,962.62 mi (7,986.56 km) |
