| Boulogne-sur-Mer to Kortenberg | 127.89 mi (205.82 km) |
| Boulogne-sur-Mer to Kortrijk | 72.55 mi (116.75 km) |
| Boulogne-sur-Mer to Kraainem | 124.49 mi (200.35 km) |
| Boulogne-sur-Mer to Kruibeke | 120.78 mi (194.38 km) |
| Boulogne-sur-Mer to Kuurne | 73.52 mi (118.31 km) |
| Boulogne-sur-Mer to La Bruyere | 140.52 mi (226.14 km) |
| Boulogne-sur-Mer to La Calamine | 191.84 mi (308.73 km) |
| Boulogne-sur-Mer to La Louviere | 114.07 mi (183.58 km) |
| Boulogne-sur-Mer to Laarne | 99.50 mi (160.13 km) |
| Boulogne-sur-Mer to Laeken | 120.14 mi (193.35 km) |
| Boulogne-sur-Mer to Lanaken | 176.52 mi (284.08 km) |
| Boulogne-sur-Mer to Landen | 151.58 mi (243.94 km) |
| Boulogne-sur-Mer to Lebbeke | 110.73 mi (178.21 km) |
| Boulogne-sur-Mer to Lede | 104.65 mi (168.42 km) |
| Boulogne-sur-Mer to Ledegem | 66.62 mi (107.21 km) |
