| Oristano to Navodari | 1,067.48 mi (1,717.95 km) |
| Oristano to Negresti-Oas | 918.42 mi (1,478.05 km) |
| Oristano to Nehoiu | 973.32 mi (1,566.41 km) |
| Oristano to Ocna Mures | 888.36 mi (1,429.67 km) |
| Oristano to Odobesti | 1,016.83 mi (1,636.42 km) |
| Oristano to Odorheiu Secuiesc | 949.44 mi (1,527.97 km) |
| Oristano to Oltenita | 968.27 mi (1,558.28 km) |
| Oristano to Onesti | 1,013.76 mi (1,631.48 km) |
| Oristano to Oradea | 829.77 mi (1,335.39 km) |
| Oristano to Orastie | 844.17 mi (1,358.56 km) |
| Oristano to Oravita | 754.45 mi (1,214.18 km) |
| Oristano to Orsova | 778.59 mi (1,253.01 km) |
| Oristano to Otelu Rosu | 797.50 mi (1,283.45 km) |
| Oristano to Otopeni | 947.78 mi (1,525.30 km) |
| Oristano to Ovidiu | 1,064.30 mi (1,712.82 km) |
