| Sint-Niklaas to Sofia | 1,073.22 mi (1,727.17 km) |
| Sint-Niklaas to Sopot | 1,131.42 mi (1,820.85 km) |
| Sint-Niklaas to Sozopol | 1,260.30 mi (2,028.25 km) |
| Sint-Niklaas to Sredets | 1,242.70 mi (1,999.93 km) |
| Sint-Niklaas to Stamboliyski | 1,145.43 mi (1,843.39 km) |
| Sint-Niklaas to Stara Zagora | 1,176.64 mi (1,893.62 km) |
| Sint-Niklaas to Svilengrad | 1,227.50 mi (1,975.46 km) |
| Sint-Niklaas to Svishtov | 1,115.53 mi (1,795.27 km) |
| Sint-Niklaas to Targovishte | 1,180.66 mi (1,900.08 km) |
| Sint-Niklaas to Teteven | 1,100.77 mi (1,771.51 km) |
| Sint-Niklaas to Troyan | 1,120.13 mi (1,802.68 km) |
| Sint-Niklaas to Tryavna | 1,152.27 mi (1,854.40 km) |
| Sint-Niklaas to Tutrakan | 1,150.87 mi (1,852.14 km) |
| Sint-Niklaas to Varna | 1,236.94 mi (1,990.67 km) |
| Sint-Niklaas to Veliki Preslav | 1,193.58 mi (1,920.89 km) |
