| Boucau to Smolyan | 1,334.00 mi (2,146.87 km) |
| Boucau to Sofia | 1,248.39 mi (2,009.09 km) |
| Boucau to Sopot | 1,319.79 mi (2,124.00 km) |
| Boucau to Sozopol | 1,469.97 mi (2,365.69 km) |
| Boucau to Sredets | 1,446.14 mi (2,327.34 km) |
| Boucau to Stamboliyski | 1,316.60 mi (2,118.87 km) |
| Boucau to Stara Zagora | 1,367.72 mi (2,201.13 km) |
| Boucau to Svilengrad | 1,405.81 mi (2,262.43 km) |
| Boucau to Svishtov | 1,337.57 mi (2,152.62 km) |
| Boucau to Targovishte | 1,402.86 mi (2,257.68 km) |
| Boucau to Teteven | 1,292.18 mi (2,079.56 km) |
| Boucau to Troyan | 1,314.98 mi (2,116.26 km) |
| Boucau to Tryavna | 1,354.12 mi (2,179.25 km) |
| Boucau to Tutrakan | 1,395.44 mi (2,245.75 km) |
| Boucau to Varna | 1,469.23 mi (2,364.50 km) |
