| Swallownest to Opwijk | 286.05 mi (460.35 km) |
| Swallownest to Ostend | 232.23 mi (373.74 km) |
| Swallownest to Oud-Heverlee | 308.41 mi (496.33 km) |
| Swallownest to Oud-Turnhout | 301.34 mi (484.96 km) |
| Swallownest to Oudenaarde | 271.58 mi (437.07 km) |
| Swallownest to Oudenburg | 236.79 mi (381.08 km) |
| Swallownest to Oupeye | 348.12 mi (560.25 km) |
| Swallownest to Overijse | 305.87 mi (492.25 km) |
| Swallownest to Overpelt | 321.00 mi (516.61 km) |
| Swallownest to Paal | 318.38 mi (512.39 km) |
| Swallownest to Peer | 325.32 mi (523.56 km) |
| Swallownest to Pepinster | 359.95 mi (579.29 km) |
| Swallownest to Peruwelz | 286.88 mi (461.69 km) |
| Swallownest to Perwez | 322.36 mi (518.79 km) |
| Swallownest to Philippeville | 332.69 mi (535.41 km) |
