| Saint-Gilles to Opwijk | 503.75 mi (810.70 km) |
| Saint-Gilles to Ostend | 526.25 mi (846.91 km) |
| Saint-Gilles to Oud-Heverlee | 494.52 mi (795.85 km) |
| Saint-Gilles to Oud-Turnhout | 528.42 mi (850.41 km) |
| Saint-Gilles to Oudenaarde | 497.07 mi (799.96 km) |
| Saint-Gilles to Oudenburg | 522.85 mi (841.44 km) |
| Saint-Gilles to Oupeye | 489.06 mi (787.07 km) |
| Saint-Gilles to Overijse | 490.97 mi (790.13 km) |
| Saint-Gilles to Overpelt | 522.91 mi (841.54 km) |
| Saint-Gilles to Paal | 509.80 mi (820.44 km) |
| Saint-Gilles to Peer | 517.29 mi (832.50 km) |
| Saint-Gilles to Pepinster | 480.39 mi (773.11 km) |
| Saint-Gilles to Peruwelz | 474.19 mi (763.14 km) |
| Saint-Gilles to Perwez | 480.28 mi (772.94 km) |
| Saint-Gilles to Philippeville | 450.68 mi (725.29 km) |
