| Rockville to Smolyan | 5,015.70 mi (8,072.00 km) |
| Rockville to Sofia | 4,913.31 mi (7,907.21 km) |
| Rockville to Sopot | 4,973.27 mi (8,003.71 km) |
| Rockville to Sozopol | 5,101.81 mi (8,210.57 km) |
| Rockville to Sredets | 5,084.71 mi (8,183.05 km) |
| Rockville to Stamboliyski | 4,985.93 mi (8,024.08 km) |
| Rockville to Stara Zagora | 5,018.80 mi (8,076.98 km) |
| Rockville to Svilengrad | 5,069.30 mi (8,158.24 km) |
| Rockville to Svishtov | 4,957.20 mi (7,977.85 km) |
| Rockville to Targovishte | 5,021.73 mi (8,081.70 km) |
| Rockville to Teteven | 4,942.61 mi (7,954.36 km) |
| Rockville to Troyan | 4,962.23 mi (7,985.94 km) |
| Rockville to Tryavna | 4,994.54 mi (8,037.94 km) |
| Rockville to Tutrakan | 4,989.22 mi (8,029.38 km) |
| Rockville to Varna | 5,075.91 mi (8,168.88 km) |
