| Herstal to Navodari | 1,152.97 mi (1,855.53 km) |
| Herstal to Negresti-Oas | 822.86 mi (1,324.27 km) |
| Herstal to Nehoiu | 1,019.43 mi (1,640.62 km) |
| Herstal to Ocna Mures | 882.05 mi (1,419.52 km) |
| Herstal to Odobesti | 1,038.82 mi (1,671.81 km) |
| Herstal to Odorheiu Secuiesc | 946.17 mi (1,522.72 km) |
| Herstal to Oltenita | 1,077.83 mi (1,734.60 km) |
| Herstal to Onesti | 1,011.09 mi (1,627.19 km) |
| Herstal to Oradea | 778.89 mi (1,253.50 km) |
| Herstal to Orastie | 871.24 mi (1,402.12 km) |
| Herstal to Oravita | 837.22 mi (1,347.37 km) |
| Herstal to Orsova | 878.24 mi (1,413.40 km) |
| Herstal to Otelu Rosu | 847.14 mi (1,363.34 km) |
| Herstal to Otopeni | 1,037.15 mi (1,669.13 km) |
| Herstal to Ovidiu | 1,152.50 mi (1,854.76 km) |
