| Mountain Ash to Smolyan | 1,490.86 mi (2,399.31 km) |
| Mountain Ash to Sofia | 1,388.50 mi (2,234.57 km) |
| Mountain Ash to Sopot | 1,449.22 mi (2,332.29 km) |
| Mountain Ash to Sozopol | 1,581.60 mi (2,545.34 km) |
| Mountain Ash to Sredets | 1,563.27 mi (2,515.84 km) |
| Mountain Ash to Stamboliyski | 1,461.16 mi (2,351.50 km) |
| Mountain Ash to Stara Zagora | 1,495.26 mi (2,406.39 km) |
| Mountain Ash to Svilengrad | 1,545.11 mi (2,486.61 km) |
| Mountain Ash to Svishtov | 1,436.84 mi (2,312.36 km) |
| Mountain Ash to Targovishte | 1,502.51 mi (2,418.05 km) |
| Mountain Ash to Teteven | 1,418.57 mi (2,282.97 km) |
| Mountain Ash to Troyan | 1,438.58 mi (2,315.18 km) |
| Mountain Ash to Tryavna | 1,471.87 mi (2,368.74 km) |
| Mountain Ash to Tutrakan | 1,474.26 mi (2,372.60 km) |
| Mountain Ash to Varna | 1,559.97 mi (2,510.54 km) |
