| Mount Holly to Smolyan | 5,346.71 mi (8,604.69 km) |
| Mount Holly to Sofia | 5,244.61 mi (8,440.39 km) |
| Mount Holly to Sopot | 5,305.13 mi (8,537.78 km) |
| Mount Holly to Sozopol | 5,434.64 mi (8,746.21 km) |
| Mount Holly to Sredets | 5,417.31 mi (8,718.32 km) |
| Mount Holly to Stamboliyski | 5,317.30 mi (8,557.36 km) |
| Mount Holly to Stara Zagora | 5,350.86 mi (8,611.38 km) |
| Mount Holly to Svilengrad | 5,401.10 mi (8,692.23 km) |
| Mount Holly to Svishtov | 5,289.96 mi (8,513.37 km) |
| Mount Holly to Targovishte | 5,354.69 mi (8,617.54 km) |
| Mount Holly to Teteven | 5,274.47 mi (8,488.44 km) |
| Mount Holly to Troyan | 5,294.25 mi (8,520.27 km) |
| Mount Holly to Tryavna | 5,326.85 mi (8,572.73 km) |
| Mount Holly to Tutrakan | 5,322.66 mi (8,566.00 km) |
| Mount Holly to Varna | 5,409.29 mi (8,705.41 km) |
