| Basingstoke to Orbetello | 840.31 mi (1,352.35 km) |
| Basingstoke to Oria | 1,162.08 mi (1,870.18 km) |
| Basingstoke to Oristano | 912.13 mi (1,467.93 km) |
| Basingstoke to Orta Nova | 1,051.21 mi (1,691.76 km) |
| Basingstoke to Orte | 877.99 mi (1,412.99 km) |
| Basingstoke to Ortona | 953.67 mi (1,534.78 km) |
| Basingstoke to Orvieto | 855.35 mi (1,376.55 km) |
| Basingstoke to Orzinuovi | 647.35 mi (1,041.80 km) |
| Basingstoke to Osimo | 865.69 mi (1,393.19 km) |
| Basingstoke to Ospitaletto | 645.16 mi (1,038.28 km) |
| Basingstoke to Ostuni | 1,148.69 mi (1,848.64 km) |
| Basingstoke to Ottaviano | 1,032.79 mi (1,662.12 km) |
| Basingstoke to Ovada | 641.29 mi (1,032.05 km) |
| Basingstoke to Ozieri | 881.32 mi (1,418.35 km) |
| Basingstoke to Paceco | 1,132.75 mi (1,822.98 km) |
