| Cwmbran to Orbetello | 921.28 mi (1,482.66 km) |
| Cwmbran to Oria | 1,247.07 mi (2,006.97 km) |
| Cwmbran to Oristano | 983.25 mi (1,582.38 km) |
| Cwmbran to Orta Nova | 1,135.60 mi (1,827.58 km) |
| Cwmbran to Orte | 960.54 mi (1,545.85 km) |
| Cwmbran to Ortona | 1,038.09 mi (1,670.64 km) |
| Cwmbran to Orvieto | 937.96 mi (1,509.49 km) |
| Cwmbran to Orzinuovi | 731.78 mi (1,177.69 km) |
| Cwmbran to Osimo | 950.67 mi (1,529.95 km) |
| Cwmbran to Ospitaletto | 730.00 mi (1,174.82 km) |
| Cwmbran to Ostuni | 1,233.85 mi (1,985.69 km) |
| Cwmbran to Ottaviano | 1,115.52 mi (1,795.26 km) |
| Cwmbran to Ovada | 722.42 mi (1,162.63 km) |
| Cwmbran to Ozieri | 954.69 mi (1,536.42 km) |
| Cwmbran to Paceco | 1,209.00 mi (1,945.70 km) |
