| Alenquer to Navodari | 1,957.75 mi (3,150.69 km) |
| Alenquer to Negresti-Oas | 1,721.98 mi (2,771.26 km) |
| Alenquer to Nehoiu | 1,843.71 mi (2,967.16 km) |
| Alenquer to Ocna Mures | 1,730.07 mi (2,784.28 km) |
| Alenquer to Odobesti | 1,881.13 mi (3,027.38 km) |
| Alenquer to Odorheiu Secuiesc | 1,798.21 mi (2,893.94 km) |
| Alenquer to Oltenita | 1,860.51 mi (2,994.21 km) |
| Alenquer to Onesti | 1,867.97 mi (3,006.21 km) |
| Alenquer to Oradea | 1,644.40 mi (2,646.40 km) |
| Alenquer to Orastie | 1,695.44 mi (2,728.55 km) |
| Alenquer to Oravita | 1,618.09 mi (2,604.06 km) |
| Alenquer to Orsova | 1,651.58 mi (2,657.95 km) |
| Alenquer to Otelu Rosu | 1,652.88 mi (2,660.05 km) |
| Alenquer to Otopeni | 1,831.91 mi (2,948.18 km) |
| Alenquer to Ovidiu | 1,955.27 mi (3,146.71 km) |
