| Castleford to Montalegre | 873.50 mi (1,405.76 km) |
| Castleford to Montemor-o-Novo | 1,090.22 mi (1,754.55 km) |
| Castleford to Montemor-o-Velho | 996.65 mi (1,603.96 km) |
| Castleford to Montijo | 1,098.03 mi (1,767.11 km) |
| Castleford to Mortagua | 972.02 mi (1,564.31 km) |
| Castleford to Moura | 1,114.77 mi (1,794.04 km) |
| Castleford to Murtosa | 958.60 mi (1,542.71 km) |
| Castleford to Nazare | 1,040.14 mi (1,673.94 km) |
| Castleford to Nelas | 960.75 mi (1,546.18 km) |
| Castleford to Obidos | 1,057.54 mi (1,701.94 km) |
| Castleford to Odemira | 1,167.28 mi (1,878.55 km) |
| Castleford to Odivelas | 1,095.32 mi (1,762.74 km) |
| Castleford to Oeiras | 1,104.57 mi (1,777.63 km) |
| Castleford to Olhao | 1,194.13 mi (1,921.77 km) |
| Castleford to Oliveira de Azemeis | 949.01 mi (1,527.29 km) |
