| Boulogne-sur-Mer to Roeselare | 67.53 mi (108.68 km) |
| Boulogne-sur-Mer to Ronse | 86.82 mi (139.73 km) |
| Boulogne-sur-Mer to Rotselaar | 135.97 mi (218.82 km) |
| Boulogne-sur-Mer to Rumst | 124.54 mi (200.43 km) |
| Boulogne-sur-Mer to Saint-Ghislain | 98.46 mi (158.46 km) |
| Boulogne-sur-Mer to Saint-Nicolas | 171.66 mi (276.26 km) |
| Boulogne-sur-Mer to Saint-Vith | 200.88 mi (323.28 km) |
| Boulogne-sur-Mer to Scherpenheuvel | 147.72 mi (237.74 km) |
| Boulogne-sur-Mer to Schilde | 133.09 mi (214.19 km) |
| Boulogne-sur-Mer to Schoten | 130.59 mi (210.17 km) |
| Boulogne-sur-Mer to Seneffe | 116.26 mi (187.10 km) |
| Boulogne-sur-Mer to Seraing | 170.46 mi (274.33 km) |
| Boulogne-sur-Mer to Sint-Amandsberg | 95.74 mi (154.08 km) |
| Boulogne-sur-Mer to Sint-Andries | 75.70 mi (121.82 km) |
| Boulogne-sur-Mer to Sint-Genesius-Rode | 119.45 mi (192.24 km) |
