| Plymouth to Orbetello | 911.13 mi (1,466.32 km) |
| Plymouth to Oria | 1,249.67 mi (2,011.14 km) |
| Plymouth to Oristano | 950.22 mi (1,529.24 km) |
| Plymouth to Orta Nova | 1,135.97 mi (1,828.17 km) |
| Plymouth to Orte | 955.05 mi (1,537.01 km) |
| Plymouth to Ortona | 1,039.13 mi (1,672.32 km) |
| Plymouth to Orvieto | 932.82 mi (1,501.23 km) |
| Plymouth to Orzinuovi | 735.46 mi (1,183.61 km) |
| Plymouth to Osimo | 954.76 mi (1,536.54 km) |
| Plymouth to Ospitaletto | 735.43 mi (1,183.56 km) |
| Plymouth to Ostuni | 1,237.28 mi (1,991.21 km) |
| Plymouth to Ottaviano | 1,109.65 mi (1,785.81 km) |
| Plymouth to Ovada | 714.83 mi (1,150.41 km) |
| Plymouth to Ozieri | 926.20 mi (1,490.58 km) |
| Plymouth to Paceco | 1,184.99 mi (1,907.05 km) |
