| Castleford to Opwijk | 301.12 mi (484.60 km) |
| Castleford to Ostend | 248.89 mi (400.54 km) |
| Castleford to Oud-Heverlee | 323.08 mi (519.95 km) |
| Castleford to Oud-Turnhout | 313.71 mi (504.87 km) |
| Castleford to Oudenaarde | 288.14 mi (463.71 km) |
| Castleford to Oudenburg | 253.43 mi (407.85 km) |
| Castleford to Oupeye | 361.66 mi (582.04 km) |
| Castleford to Overijse | 320.94 mi (516.51 km) |
| Castleford to Overpelt | 333.10 mi (536.08 km) |
| Castleford to Paal | 331.51 mi (533.52 km) |
| Castleford to Peer | 337.68 mi (543.45 km) |
| Castleford to Pepinster | 373.68 mi (601.39 km) |
| Castleford to Peruwelz | 304.46 mi (489.98 km) |
| Castleford to Perwez | 337.46 mi (543.10 km) |
| Castleford to Philippeville | 349.43 mi (562.35 km) |
