| Westminster to Orbetello | 821.33 mi (1,321.80 km) |
| Westminster to Oria | 1,136.67 mi (1,829.29 km) |
| Westminster to Oristano | 903.21 mi (1,453.58 km) |
| Westminster to Orta Nova | 1,026.97 mi (1,652.74 km) |
| Westminster to Orte | 856.81 mi (1,378.90 km) |
| Westminster to Ortona | 929.48 mi (1,495.85 km) |
| Westminster to Orvieto | 834.12 mi (1,342.39 km) |
| Westminster to Orzinuovi | 623.69 mi (1,003.73 km) |
| Westminster to Osimo | 840.62 mi (1,352.84 km) |
| Westminster to Ospitaletto | 620.77 mi (999.04 km) |
| Westminster to Ostuni | 1,122.99 mi (1,807.28 km) |
| Westminster to Ottaviano | 1,011.13 mi (1,627.26 km) |
| Westminster to Ovada | 622.63 mi (1,002.02 km) |
| Westminster to Ozieri | 870.43 mi (1,400.82 km) |
| Westminster to Paceco | 1,118.58 mi (1,800.17 km) |
