| Silver Spring to Smolyan | 5,013.73 mi (8,068.82 km) |
| Silver Spring to Sofia | 4,911.39 mi (7,904.11 km) |
| Silver Spring to Sopot | 4,971.44 mi (8,000.77 km) |
| Silver Spring to Sozopol | 5,100.17 mi (8,207.93 km) |
| Silver Spring to Sredets | 5,083.02 mi (8,180.33 km) |
| Silver Spring to Stamboliyski | 4,984.02 mi (8,021.00 km) |
| Silver Spring to Stara Zagora | 5,017.01 mi (8,074.10 km) |
| Silver Spring to Svilengrad | 5,067.46 mi (8,155.29 km) |
| Silver Spring to Svishtov | 4,955.54 mi (7,975.18 km) |
| Silver Spring to Targovishte | 5,020.12 mi (8,079.10 km) |
| Silver Spring to Teteven | 4,940.78 mi (7,951.42 km) |
| Silver Spring to Troyan | 4,960.43 mi (7,983.04 km) |
| Silver Spring to Tryavna | 4,992.79 mi (8,035.12 km) |
| Silver Spring to Tutrakan | 4,987.71 mi (8,026.95 km) |
| Silver Spring to Varna | 5,074.38 mi (8,166.43 km) |
