| Opglabbeek to Navodari | 1,161.49 mi (1,869.24 km) |
| Opglabbeek to Negresti-Oas | 828.50 mi (1,333.34 km) |
| Opglabbeek to Nehoiu | 1,027.84 mi (1,654.15 km) |
| Opglabbeek to Ocna Mures | 890.25 mi (1,432.72 km) |
| Opglabbeek to Odobesti | 1,046.17 mi (1,683.65 km) |
| Opglabbeek to Odorheiu Secuiesc | 953.65 mi (1,534.75 km) |
| Opglabbeek to Oltenita | 1,087.84 mi (1,750.70 km) |
| Opglabbeek to Onesti | 1,017.84 mi (1,638.05 km) |
| Opglabbeek to Oradea | 787.04 mi (1,266.62 km) |
| Opglabbeek to Orastie | 880.82 mi (1,417.54 km) |
| Opglabbeek to Oravita | 849.25 mi (1,366.73 km) |
| Opglabbeek to Orsova | 890.23 mi (1,432.69 km) |
| Opglabbeek to Otelu Rosu | 857.88 mi (1,380.62 km) |
| Opglabbeek to Otopeni | 1,046.87 mi (1,684.78 km) |
| Opglabbeek to Ovidiu | 1,161.12 mi (1,868.64 km) |
