| Willebroek to Opwijk | 10.55 mi (16.98 km) |
| Willebroek to Ostend | 63.69 mi (102.49 km) |
| Willebroek to Oud-Heverlee | 20.75 mi (33.39 km) |
| Willebroek to Oud-Turnhout | 31.80 mi (51.18 km) |
| Willebroek to Oudenaarde | 36.57 mi (58.86 km) |
| Willebroek to Oudenburg | 59.81 mi (96.26 km) |
| Willebroek to Oupeye | 60.90 mi (98.00 km) |
| Willebroek to Overijse | 20.88 mi (33.61 km) |
| Willebroek to Overpelt | 46.68 mi (75.13 km) |
| Willebroek to Paal | 35.06 mi (56.43 km) |
| Willebroek to Peer | 47.38 mi (76.25 km) |
| Willebroek to Pepinster | 72.11 mi (116.05 km) |
| Willebroek to Peruwelz | 51.14 mi (82.29 km) |
| Willebroek to Perwez | 36.30 mi (58.42 km) |
| Willebroek to Philippeville | 60.42 mi (97.24 km) |
