| Saint-Omer to Opwijk | 85.19 mi (137.11 km) |
| Saint-Omer to Ostend | 43.69 mi (70.32 km) |
| Saint-Omer to Oud-Heverlee | 105.24 mi (169.37 km) |
| Saint-Omer to Oud-Turnhout | 124.64 mi (200.58 km) |
| Saint-Omer to Oudenaarde | 58.90 mi (94.79 km) |
| Saint-Omer to Oudenburg | 44.02 mi (70.85 km) |
| Saint-Omer to Oupeye | 147.94 mi (238.09 km) |
| Saint-Omer to Overijse | 99.34 mi (159.87 km) |
| Saint-Omer to Overpelt | 141.03 mi (226.96 km) |
| Saint-Omer to Paal | 128.48 mi (206.77 km) |
| Saint-Omer to Peer | 141.51 mi (227.74 km) |
| Saint-Omer to Pepinster | 156.24 mi (251.45 km) |
| Saint-Omer to Peruwelz | 60.13 mi (96.76 km) |
| Saint-Omer to Perwez | 112.13 mi (180.46 km) |
| Saint-Omer to Philippeville | 107.55 mi (173.08 km) |
