| Duffel to Sofia | 1,056.24 mi (1,699.86 km) |
| Duffel to Sopot | 1,114.34 mi (1,793.35 km) |
| Duffel to Sozopol | 1,243.09 mi (2,000.56 km) |
| Duffel to Sredets | 1,225.52 mi (1,972.28 km) |
| Duffel to Stamboliyski | 1,128.43 mi (1,816.03 km) |
| Duffel to Stara Zagora | 1,159.53 mi (1,866.08 km) |
| Duffel to Svilengrad | 1,210.41 mi (1,947.97 km) |
| Duffel to Svishtov | 1,098.33 mi (1,767.59 km) |
| Duffel to Targovishte | 1,163.44 mi (1,872.37 km) |
| Duffel to Teteven | 1,083.69 mi (1,744.02 km) |
| Duffel to Troyan | 1,103.03 mi (1,775.15 km) |
| Duffel to Tryavna | 1,135.12 mi (1,826.81 km) |
| Duffel to Tutrakan | 1,133.62 mi (1,824.39 km) |
| Duffel to Varna | 1,219.70 mi (1,962.92 km) |
| Duffel to Veliki Preslav | 1,176.36 mi (1,893.17 km) |
