| Herstal to Oestrich-Winkel | 114.09 mi (183.60 km) |
| Herstal to Offenburg | 183.63 mi (295.53 km) |
| Herstal to Oftersheim | 158.69 mi (255.38 km) |
| Herstal to Ohrdruf | 223.17 mi (359.17 km) |
| Herstal to Ohringen | 199.57 mi (321.17 km) |
| Herstal to Olbernhau | 337.06 mi (542.44 km) |
| Herstal to Olching | 306.89 mi (493.89 km) |
| Herstal to Oldenburg | 203.43 mi (327.39 km) |
| Herstal to Oldenburg in Holstein | 334.21 mi (537.86 km) |
| Herstal to Olfen | 104.90 mi (168.82 km) |
| Herstal to Olpe | 98.98 mi (159.29 km) |
| Herstal to Olsberg | 132.58 mi (213.37 km) |
| Herstal to Oranienburg | 355.83 mi (572.65 km) |
| Herstal to Ortenberg | 151.87 mi (244.41 km) |
| Herstal to Oschatz | 327.88 mi (527.67 km) |
