| Chalco to Smolyan | 5,628.49 mi (9,058.18 km) |
| Chalco to Sofia | 5,524.21 mi (8,890.35 km) |
| Chalco to Sopot | 5,574.41 mi (8,971.15 km) |
| Chalco to Sozopol | 5,683.31 mi (9,146.40 km) |
| Chalco to Sredets | 5,670.72 mi (9,126.15 km) |
| Chalco to Stamboliyski | 5,594.15 mi (9,002.91 km) |
| Chalco to Stara Zagora | 5,615.60 mi (9,037.44 km) |
| Chalco to Svilengrad | 5,668.99 mi (9,123.35 km) |
| Chalco to Svishtov | 5,543.57 mi (8,921.52 km) |
| Chalco to Targovishte | 5,602.89 mi (9,016.98 km) |
| Chalco to Teteven | 5,544.42 mi (8,922.89 km) |
| Chalco to Troyan | 5,561.12 mi (8,949.76 km) |
| Chalco to Tryavna | 5,587.85 mi (8,992.77 km) |
| Chalco to Tutrakan | 5,561.55 mi (8,950.46 km) |
| Chalco to Varna | 5,647.33 mi (9,088.50 km) |
