| Hwlffordd to Opwijk | 398.61 mi (641.50 km) |
| Hwlffordd to Ostend | 341.38 mi (549.40 km) |
| Hwlffordd to Oud-Heverlee | 421.16 mi (677.79 km) |
| Hwlffordd to Oud-Turnhout | 428.52 mi (689.64 km) |
| Hwlffordd to Oudenaarde | 375.57 mi (604.42 km) |
| Hwlffordd to Oudenburg | 345.33 mi (555.75 km) |
| Hwlffordd to Oupeye | 464.67 mi (747.81 km) |
| Hwlffordd to Overijse | 416.27 mi (669.92 km) |
| Hwlffordd to Overpelt | 448.10 mi (721.14 km) |
| Hwlffordd to Paal | 439.81 mi (707.81 km) |
| Hwlffordd to Peer | 450.64 mi (725.23 km) |
| Hwlffordd to Pepinster | 474.41 mi (763.50 km) |
| Hwlffordd to Peruwelz | 380.86 mi (612.93 km) |
| Hwlffordd to Perwez | 430.90 mi (693.46 km) |
| Hwlffordd to Philippeville | 428.10 mi (688.97 km) |
