| Saint-Gratien to Opwijk | 161.63 mi (260.13 km) |
| Saint-Gratien to Ostend | 158.26 mi (254.70 km) |
| Saint-Gratien to Oud-Heverlee | 166.70 mi (268.28 km) |
| Saint-Gratien to Oud-Turnhout | 201.33 mi (324.01 km) |
| Saint-Gratien to Oudenaarde | 142.38 mi (229.14 km) |
| Saint-Gratien to Oudenburg | 156.07 mi (251.16 km) |
| Saint-Gratien to Oupeye | 191.84 mi (308.73 km) |
| Saint-Gratien to Overijse | 160.31 mi (258.00 km) |
| Saint-Gratien to Overpelt | 208.17 mi (335.02 km) |
| Saint-Gratien to Paal | 191.99 mi (308.98 km) |
| Saint-Gratien to Peer | 205.10 mi (330.07 km) |
| Saint-Gratien to Pepinster | 192.35 mi (309.56 km) |
| Saint-Gratien to Peruwelz | 121.50 mi (195.54 km) |
| Saint-Gratien to Perwez | 160.56 mi (258.40 km) |
| Saint-Gratien to Philippeville | 132.33 mi (212.96 km) |
