| Gallarate to Opwijk | 422.91 mi (680.61 km) |
| Gallarate to Ostend | 468.77 mi (754.41 km) |
| Gallarate to Oud-Heverlee | 404.24 mi (650.56 km) |
| Gallarate to Oud-Turnhout | 427.52 mi (688.03 km) |
| Gallarate to Oudenaarde | 430.31 mi (692.52 km) |
| Gallarate to Oudenburg | 464.32 mi (747.25 km) |
| Gallarate to Oupeye | 377.35 mi (607.29 km) |
| Gallarate to Overijse | 404.17 mi (650.45 km) |
| Gallarate to Overpelt | 413.49 mi (665.45 km) |
| Gallarate to Paal | 406.68 mi (654.49 km) |
| Gallarate to Peer | 407.54 mi (655.86 km) |
| Gallarate to Pepinster | 365.35 mi (587.97 km) |
| Gallarate to Peruwelz | 412.27 mi (663.48 km) |
| Gallarate to Perwez | 388.47 mi (625.18 km) |
| Gallarate to Philippeville | 369.64 mi (594.88 km) |
