| Portalegre to Navodari | 1,871.60 mi (3,012.05 km) |
| Portalegre to Negresti-Oas | 1,639.19 mi (2,638.02 km) |
| Portalegre to Nehoiu | 1,758.26 mi (2,829.64 km) |
| Portalegre to Ocna Mures | 1,645.62 mi (2,648.37 km) |
| Portalegre to Odobesti | 1,795.99 mi (2,890.37 km) |
| Portalegre to Odorheiu Secuiesc | 1,713.61 mi (2,757.78 km) |
| Portalegre to Oltenita | 1,774.19 mi (2,855.29 km) |
| Portalegre to Onesti | 1,783.26 mi (2,869.88 km) |
| Portalegre to Oradea | 1,560.85 mi (2,511.95 km) |
| Portalegre to Orastie | 1,610.51 mi (2,591.87 km) |
| Portalegre to Oravita | 1,532.51 mi (2,466.34 km) |
| Portalegre to Orsova | 1,565.72 mi (2,519.78 km) |
| Portalegre to Otelu Rosu | 1,567.69 mi (2,522.96 km) |
| Portalegre to Otopeni | 1,745.88 mi (2,809.73 km) |
| Portalegre to Ovidiu | 1,869.09 mi (3,008.01 km) |
