| Calne to Orbetello | 878.01 mi (1,413.02 km) |
| Calne to Oria | 1,201.94 mi (1,934.34 km) |
| Calne to Oristano | 944.76 mi (1,520.45 km) |
| Calne to Orta Nova | 1,090.75 mi (1,755.39 km) |
| Calne to Orte | 916.53 mi (1,475.01 km) |
| Calne to Ortona | 993.21 mi (1,598.42 km) |
| Calne to Orvieto | 893.91 mi (1,438.61 km) |
| Calne to Orzinuovi | 686.87 mi (1,105.41 km) |
| Calne to Osimo | 905.53 mi (1,457.31 km) |
| Calne to Ospitaletto | 684.90 mi (1,102.25 km) |
| Calne to Ostuni | 1,188.64 mi (1,912.94 km) |
| Calne to Ottaviano | 1,071.44 mi (1,724.31 km) |
| Calne to Ovada | 679.03 mi (1,092.79 km) |
| Calne to Ozieri | 915.09 mi (1,472.69 km) |
| Calne to Paceco | 1,168.05 mi (1,879.80 km) |
