| Castleford to Oberkirch | 543.06 mi (873.97 km) |
| Castleford to Obernburg am Main | 521.82 mi (839.80 km) |
| Castleford to Obernkirchen | 446.52 mi (718.61 km) |
| Castleford to Oberschleissheim | 675.61 mi (1,087.29 km) |
| Castleford to Oberstdorf | 669.83 mi (1,077.99 km) |
| Castleford to Obertraubling | 668.07 mi (1,075.15 km) |
| Castleford to Obertshausen | 501.67 mi (807.35 km) |
| Castleford to Oberursel | 486.98 mi (783.72 km) |
| Castleford to Ochsenfurt | 563.29 mi (906.53 km) |
| Castleford to Ochsenhausen | 627.05 mi (1,009.15 km) |
| Castleford to Ochtrup | 370.42 mi (596.13 km) |
| Castleford to Odenthal | 402.24 mi (647.34 km) |
| Castleford to Oelde | 417.70 mi (672.23 km) |
| Castleford to Oelsnitz | 616.75 mi (992.56 km) |
| Castleford to Oer-Erkenschwick | 387.65 mi (623.87 km) |
