| Castleford to Olivares | 1,149.14 mi (1,849.36 km) |
| Castleford to Olivenza | 1,073.33 mi (1,727.36 km) |
| Castleford to Olot | 816.22 mi (1,313.58 km) |
| Castleford to Onate | 739.68 mi (1,190.41 km) |
| Castleford to Onda | 951.65 mi (1,531.53 km) |
| Castleford to Onteniente | 1,029.67 mi (1,657.09 km) |
| Castleford to Orihuela | 1,080.13 mi (1,738.30 km) |
| Castleford to Osuna | 1,152.79 mi (1,855.24 km) |
| Castleford to Ourense | 840.93 mi (1,353.34 km) |
| Castleford to Oviedo | 744.04 mi (1,197.41 km) |
| Castleford to Paiporta | 988.20 mi (1,590.35 km) |
| Castleford to Pajara | 1,867.67 mi (3,005.72 km) |
| Castleford to Palafolls | 853.61 mi (1,373.76 km) |
| Castleford to Palafrugell | 841.30 mi (1,353.94 km) |
| Castleford to Palamos | 845.74 mi (1,361.08 km) |
