| Calais to Smolyan | 1,260.80 mi (2,029.07 km) |
| Calais to Sofia | 1,158.06 mi (1,863.72 km) |
| Calais to Sopot | 1,218.16 mi (1,960.43 km) |
| Calais to Sozopol | 1,349.98 mi (2,172.59 km) |
| Calais to Sredets | 1,331.72 mi (2,143.20 km) |
| Calais to Stamboliyski | 1,230.63 mi (1,980.51 km) |
| Calais to Stara Zagora | 1,264.03 mi (2,034.27 km) |
| Calais to Svilengrad | 1,314.11 mi (2,114.86 km) |
| Calais to Svishtov | 1,205.21 mi (1,939.60 km) |
| Calais to Targovishte | 1,270.86 mi (2,045.24 km) |
| Calais to Teteven | 1,187.50 mi (1,911.10 km) |
| Calais to Troyan | 1,207.38 mi (1,943.09 km) |
| Calais to Tryavna | 1,240.45 mi (1,996.32 km) |
| Calais to Tutrakan | 1,242.70 mi (1,999.94 km) |
| Calais to Varna | 1,328.36 mi (2,137.78 km) |
