| Grande-Synthe to Opwijk | 81.85 mi (131.72 km) |
| Grande-Synthe to Ostend | 30.49 mi (49.06 km) |
| Grande-Synthe to Oud-Heverlee | 103.70 mi (166.90 km) |
| Grande-Synthe to Oud-Turnhout | 118.00 mi (189.90 km) |
| Grande-Synthe to Oudenaarde | 57.61 mi (92.72 km) |
| Grande-Synthe to Oudenburg | 32.44 mi (52.20 km) |
| Grande-Synthe to Oupeye | 147.19 mi (236.87 km) |
| Grande-Synthe to Overijse | 98.49 mi (158.51 km) |
| Grande-Synthe to Overpelt | 135.78 mi (218.51 km) |
| Grande-Synthe to Paal | 124.73 mi (200.73 km) |
| Grande-Synthe to Peer | 137.02 mi (220.52 km) |
| Grande-Synthe to Pepinster | 156.54 mi (251.93 km) |
| Grande-Synthe to Peruwelz | 65.66 mi (105.67 km) |
| Grande-Synthe to Perwez | 112.91 mi (181.72 km) |
| Grande-Synthe to Philippeville | 113.45 mi (182.58 km) |
