| Aspen Hill to Smolyan | 5,012.30 mi (8,066.52 km) |
| Aspen Hill to Sofia | 4,909.92 mi (7,901.75 km) |
| Aspen Hill to Sopot | 4,969.90 mi (7,998.29 km) |
| Aspen Hill to Sozopol | 5,098.48 mi (8,205.21 km) |
| Aspen Hill to Sredets | 5,081.37 mi (8,177.68 km) |
| Aspen Hill to Stamboliyski | 4,982.54 mi (8,018.62 km) |
| Aspen Hill to Stara Zagora | 5,015.44 mi (8,071.57 km) |
| Aspen Hill to Svilengrad | 5,065.92 mi (8,152.82 km) |
| Aspen Hill to Svishtov | 4,953.87 mi (7,972.49 km) |
| Aspen Hill to Targovishte | 5,018.41 mi (8,076.36 km) |
| Aspen Hill to Teteven | 4,939.24 mi (7,948.94 km) |
| Aspen Hill to Troyan | 4,958.87 mi (7,980.53 km) |
| Aspen Hill to Tryavna | 4,991.19 mi (8,032.54 km) |
| Aspen Hill to Tutrakan | 4,985.93 mi (8,024.07 km) |
| Aspen Hill to Varna | 5,072.61 mi (8,163.57 km) |
