| Castleford to Octeville | 282.80 mi (455.12 km) |
| Castleford to Oignies | 290.44 mi (467.41 km) |
| Castleford to Oissel | 319.96 mi (514.92 km) |
| Castleford to Olivet | 428.51 mi (689.63 km) |
| Castleford to Ollioules | 800.94 mi (1,288.99 km) |
| Castleford to Olonne-sur-Mer | 496.42 mi (798.92 km) |
| Castleford to Oloron-Sainte-Marie | 727.79 mi (1,171.26 km) |
| Castleford to Onet Village | 670.09 mi (1,078.40 km) |
| Castleford to Onnaing | 311.60 mi (501.48 km) |
| Castleford to Orange | 717.85 mi (1,155.27 km) |
| Castleford to Orchies | 297.00 mi (477.98 km) |
| Castleford to Orleans | 426.10 mi (685.75 km) |
| Castleford to Orly | 379.77 mi (611.18 km) |
| Castleford to Ormesson-sur-Marne | 379.86 mi (611.33 km) |
| Castleford to Orsay | 379.00 mi (609.94 km) |
