| Valongo to Navodari | 1,879.17 mi (3,024.23 km) |
| Valongo to Negresti-Oas | 1,625.90 mi (2,616.64 km) |
| Valongo to Nehoiu | 1,760.50 mi (2,833.25 km) |
| Valongo to Ocna Mures | 1,641.50 mi (2,641.74 km) |
| Valongo to Odobesti | 1,795.86 mi (2,890.16 km) |
| Valongo to Odorheiu Secuiesc | 1,710.23 mi (2,752.35 km) |
| Valongo to Oltenita | 1,783.59 mi (2,870.41 km) |
| Valongo to Onesti | 1,780.35 mi (2,865.19 km) |
| Valongo to Oradea | 1,551.76 mi (2,497.31 km) |
| Valongo to Orastie | 1,609.57 mi (2,590.35 km) |
| Valongo to Oravita | 1,536.44 mi (2,472.66 km) |
| Valongo to Orsova | 1,571.75 mi (2,529.48 km) |
| Valongo to Otelu Rosu | 1,568.66 mi (2,524.52 km) |
| Valongo to Otopeni | 1,752.76 mi (2,820.79 km) |
| Valongo to Ovidiu | 1,876.95 mi (3,020.66 km) |
