| Duffel to Ronse | 46.68 mi (75.12 km) |
| Duffel to Rotselaar | 13.30 mi (21.41 km) |
| Duffel to Rumst | 4.49 mi (7.23 km) |
| Duffel to Saint-Ghislain | 54.34 mi (87.44 km) |
| Duffel to Saint-Nicolas | 54.82 mi (88.22 km) |
| Duffel to Saint-Vith | 90.50 mi (145.65 km) |
| Duffel to Scherpenheuvel | 20.76 mi (33.40 km) |
| Duffel to Schilde | 9.46 mi (15.23 km) |
| Duffel to Schoten | 10.39 mi (16.72 km) |
| Duffel to Seneffe | 40.85 mi (65.74 km) |
| Duffel to Seraing | 55.81 mi (89.82 km) |
| Duffel to Sint-Amandsberg | 33.47 mi (53.86 km) |
| Duffel to Sint-Andries | 58.20 mi (93.67 km) |
| Duffel to Sint-Genesius-Rode | 25.63 mi (41.24 km) |
| Duffel to Sint-Gillis-bij-Dendermonde | 18.70 mi (30.10 km) |
