| Herstal to Obernburg am Main | 165.15 mi (265.78 km) |
| Herstal to Obernkirchen | 186.28 mi (299.78 km) |
| Herstal to Oberschleissheim | 314.32 mi (505.85 km) |
| Herstal to Oberstdorf | 307.98 mi (495.64 km) |
| Herstal to Obertraubling | 313.96 mi (505.26 km) |
| Herstal to Obertshausen | 146.99 mi (236.55 km) |
| Herstal to Oberursel | 133.43 mi (214.74 km) |
| Herstal to Ochsenfurt | 208.40 mi (335.39 km) |
| Herstal to Ochsenhausen | 264.16 mi (425.12 km) |
| Herstal to Ochtrup | 125.70 mi (202.30 km) |
| Herstal to Odenthal | 69.49 mi (111.83 km) |
| Herstal to Oelde | 135.42 mi (217.94 km) |
| Herstal to Oelsnitz | 287.31 mi (462.38 km) |
| Herstal to Oer-Erkenschwick | 97.24 mi (156.49 km) |
| Herstal to Oerlinghausen | 158.81 mi (255.58 km) |
