| Romulus to Smolyan | 5,118.59 mi (8,237.58 km) |
| Romulus to Sofia | 5,014.73 mi (8,070.42 km) |
| Romulus to Sopot | 5,070.36 mi (8,159.95 km) |
| Romulus to Sozopol | 5,190.33 mi (8,353.02 km) |
| Romulus to Sredets | 5,175.26 mi (8,328.77 km) |
| Romulus to Stamboliyski | 5,086.46 mi (8,185.87 km) |
| Romulus to Stara Zagora | 5,114.08 mi (8,230.31 km) |
| Romulus to Svilengrad | 5,166.23 mi (8,314.24 km) |
| Romulus to Svishtov | 5,047.19 mi (8,122.66 km) |
| Romulus to Targovishte | 5,109.63 mi (8,223.16 km) |
| Romulus to Teteven | 5,039.84 mi (8,110.85 km) |
| Romulus to Troyan | 5,058.19 mi (8,140.36 km) |
| Romulus to Tryavna | 5,088.02 mi (8,188.38 km) |
| Romulus to Tutrakan | 5,072.79 mi (8,163.86 km) |
| Romulus to Varna | 5,159.55 mi (8,303.49 km) |
