| Castleford to Nasaud | 1,208.03 mi (1,944.14 km) |
| Castleford to Navodari | 1,490.26 mi (2,398.34 km) |
| Castleford to Negresti-Oas | 1,148.03 mi (1,847.57 km) |
| Castleford to Nehoiu | 1,356.83 mi (2,183.61 km) |
| Castleford to Ocna Mures | 1,219.32 mi (1,962.30 km) |
| Castleford to Odobesti | 1,370.98 mi (2,206.38 km) |
| Castleford to Odorheiu Secuiesc | 1,279.55 mi (2,059.24 km) |
| Castleford to Oltenita | 1,421.96 mi (2,288.43 km) |
| Castleford to Onesti | 1,340.36 mi (2,157.09 km) |
| Castleford to Oradea | 1,116.69 mi (1,797.15 km) |
| Castleford to Orastie | 1,214.49 mi (1,954.53 km) |
| Castleford to Oravita | 1,189.48 mi (1,914.28 km) |
| Castleford to Orsova | 1,230.25 mi (1,979.89 km) |
| Castleford to Otelu Rosu | 1,194.97 mi (1,923.12 km) |
| Castleford to Otopeni | 1,380.26 mi (2,221.32 km) |
