| Gradignan to Opwijk | 482.08 mi (775.83 km) |
| Gradignan to Ostend | 474.74 mi (764.03 km) |
| Gradignan to Oud-Heverlee | 484.95 mi (780.45 km) |
| Gradignan to Oud-Turnhout | 520.54 mi (837.73 km) |
| Gradignan to Oudenaarde | 463.05 mi (745.21 km) |
| Gradignan to Oudenburg | 473.31 mi (761.72 km) |
| Gradignan to Oupeye | 502.37 mi (808.48 km) |
| Gradignan to Overijse | 478.92 mi (770.75 km) |
| Gradignan to Overpelt | 524.99 mi (844.90 km) |
| Gradignan to Paal | 508.91 mi (819.01 km) |
| Gradignan to Peer | 521.13 mi (838.68 km) |
| Gradignan to Pepinster | 499.44 mi (803.77 km) |
| Gradignan to Peruwelz | 442.23 mi (711.70 km) |
| Gradignan to Perwez | 476.40 mi (766.69 km) |
| Gradignan to Philippeville | 445.62 mi (717.16 km) |
