| Boussu to Sofia | 1,066.02 mi (1,715.60 km) |
| Boussu to Sopot | 1,126.22 mi (1,812.48 km) |
| Boussu to Sozopol | 1,258.50 mi (2,025.37 km) |
| Boussu to Sredets | 1,240.11 mi (1,995.76 km) |
| Boussu to Stamboliyski | 1,138.60 mi (1,832.39 km) |
| Boussu to Stara Zagora | 1,172.17 mi (1,886.42 km) |
| Boussu to Svilengrad | 1,222.16 mi (1,966.88 km) |
| Boussu to Svishtov | 1,113.76 mi (1,792.42 km) |
| Boussu to Targovishte | 1,179.52 mi (1,898.25 km) |
| Boussu to Teteven | 1,095.57 mi (1,763.15 km) |
| Boussu to Troyan | 1,115.50 mi (1,795.23 km) |
| Boussu to Tryavna | 1,148.70 mi (1,848.65 km) |
| Boussu to Tutrakan | 1,151.90 mi (1,853.80 km) |
| Boussu to Varna | 1,237.38 mi (1,991.36 km) |
| Boussu to Veliki Preslav | 1,192.53 mi (1,919.19 km) |
