| Willebroek to Obernburg am Main | 226.45 mi (364.44 km) |
| Willebroek to Obernkirchen | 219.78 mi (353.70 km) |
| Willebroek to Oberschleissheim | 376.02 mi (605.15 km) |
| Willebroek to Oberstdorf | 367.19 mi (590.94 km) |
| Willebroek to Obertraubling | 375.26 mi (603.92 km) |
| Willebroek to Obertshausen | 207.80 mi (334.43 km) |
| Willebroek to Oberursel | 193.88 mi (312.01 km) |
| Willebroek to Ochsenfurt | 269.56 mi (433.82 km) |
| Willebroek to Ochsenhausen | 324.43 mi (522.12 km) |
| Willebroek to Ochtrup | 144.39 mi (232.38 km) |
| Willebroek to Odenthal | 119.46 mi (192.25 km) |
| Willebroek to Oelde | 171.27 mi (275.64 km) |
| Willebroek to Oelsnitz | 343.82 mi (553.33 km) |
| Willebroek to Oer-Erkenschwick | 130.63 mi (210.23 km) |
| Willebroek to Oerlinghausen | 195.02 mi (313.86 km) |
