| Alpen to Navodari | 1,132.96 mi (1,823.32 km) |
| Alpen to Negresti-Oas | 795.47 mi (1,280.18 km) |
| Alpen to Nehoiu | 999.30 mi (1,608.21 km) |
| Alpen to Ocna Mures | 861.59 mi (1,386.59 km) |
| Alpen to Odobesti | 1,015.68 mi (1,634.58 km) |
| Alpen to Odorheiu Secuiesc | 923.53 mi (1,486.28 km) |
| Alpen to Oltenita | 1,062.21 mi (1,709.46 km) |
| Alpen to Onesti | 986.34 mi (1,587.35 km) |
| Alpen to Oradea | 758.54 mi (1,220.75 km) |
| Alpen to Orastie | 854.75 mi (1,375.59 km) |
| Alpen to Oravita | 828.22 mi (1,332.89 km) |
| Alpen to Orsova | 869.00 mi (1,398.52 km) |
| Alpen to Otelu Rosu | 834.16 mi (1,342.44 km) |
| Alpen to Otopeni | 1,020.77 mi (1,642.76 km) |
| Alpen to Ovidiu | 1,132.76 mi (1,823.01 km) |
