| Castres to Smolyan | 1,146.86 mi (1,845.70 km) |
| Castres to Sofia | 1,061.56 mi (1,708.42 km) |
| Castres to Sopot | 1,133.07 mi (1,823.50 km) |
| Castres to Sozopol | 1,283.41 mi (2,065.46 km) |
| Castres to Sredets | 1,259.48 mi (2,026.94 km) |
| Castres to Stamboliyski | 1,129.58 mi (1,817.89 km) |
| Castres to Stara Zagora | 1,180.95 mi (1,900.55 km) |
| Castres to Svilengrad | 1,218.76 mi (1,961.41 km) |
| Castres to Svishtov | 1,151.91 mi (1,853.81 km) |
| Castres to Targovishte | 1,216.92 mi (1,958.45 km) |
| Castres to Teteven | 1,105.61 mi (1,779.31 km) |
| Castres to Troyan | 1,128.44 mi (1,816.05 km) |
| Castres to Tryavna | 1,167.66 mi (1,879.17 km) |
| Castres to Tutrakan | 1,210.59 mi (1,948.26 km) |
| Castres to Varna | 1,283.46 mi (2,065.52 km) |
