| Opwijk to Sofia | 1,065.36 mi (1,714.53 km) |
| Opwijk to Sopot | 1,124.02 mi (1,808.94 km) |
| Opwijk to Sozopol | 1,253.71 mi (2,017.64 km) |
| Opwijk to Sredets | 1,235.92 mi (1,989.02 km) |
| Opwijk to Stamboliyski | 1,137.67 mi (1,830.90 km) |
| Opwijk to Stara Zagora | 1,169.42 mi (1,881.99 km) |
| Opwijk to Svilengrad | 1,220.08 mi (1,963.53 km) |
| Opwijk to Svishtov | 1,108.92 mi (1,784.63 km) |
| Opwijk to Targovishte | 1,174.21 mi (1,889.70 km) |
| Opwijk to Teteven | 1,093.36 mi (1,759.60 km) |
| Opwijk to Troyan | 1,112.86 mi (1,790.98 km) |
| Opwijk to Tryavna | 1,145.25 mi (1,843.10 km) |
| Opwijk to Tutrakan | 1,144.93 mi (1,842.58 km) |
| Opwijk to Varna | 1,230.88 mi (1,980.90 km) |
| Opwijk to Veliki Preslav | 1,187.15 mi (1,910.54 km) |
