| Ostermundigen to Opwijk | 315.08 mi (507.07 km) |
| Ostermundigen to Ostend | 360.17 mi (579.63 km) |
| Ostermundigen to Oud-Heverlee | 297.01 mi (477.99 km) |
| Ostermundigen to Oud-Turnhout | 321.90 mi (518.06 km) |
| Ostermundigen to Oudenaarde | 321.81 mi (517.91 km) |
| Ostermundigen to Oudenburg | 355.73 mi (572.49 km) |
| Ostermundigen to Oupeye | 272.56 mi (438.65 km) |
| Ostermundigen to Overijse | 296.61 mi (477.35 km) |
| Ostermundigen to Overpelt | 309.00 mi (497.28 km) |
| Ostermundigen to Paal | 301.06 mi (484.51 km) |
| Ostermundigen to Peer | 302.99 mi (487.62 km) |
| Ostermundigen to Pepinster | 260.90 mi (419.87 km) |
| Ostermundigen to Peruwelz | 303.62 mi (488.63 km) |
| Ostermundigen to Perwez | 281.18 mi (452.51 km) |
| Ostermundigen to Philippeville | 261.34 mi (420.58 km) |
