| Buckhurst Hill to Orbetello | 822.97 mi (1,324.44 km) |
| Buckhurst Hill to Oria | 1,136.15 mi (1,828.46 km) |
| Buckhurst Hill to Oristano | 907.64 mi (1,460.71 km) |
| Buckhurst Hill to Orta Nova | 1,026.87 mi (1,652.59 km) |
| Buckhurst Hill to Orte | 857.75 mi (1,380.42 km) |
| Buckhurst Hill to Ortona | 929.43 mi (1,495.77 km) |
| Buckhurst Hill to Orvieto | 835.07 mi (1,343.91 km) |
| Buckhurst Hill to Orzinuovi | 623.97 mi (1,004.18 km) |
| Buckhurst Hill to Osimo | 840.30 mi (1,352.34 km) |
| Buckhurst Hill to Ospitaletto | 620.82 mi (999.11 km) |
| Buckhurst Hill to Ostuni | 1,122.38 mi (1,806.30 km) |
| Buckhurst Hill to Ottaviano | 1,011.88 mi (1,628.46 km) |
| Buckhurst Hill to Ovada | 624.49 mi (1,005.01 km) |
| Buckhurst Hill to Ozieri | 874.35 mi (1,407.13 km) |
| Buckhurst Hill to Paceco | 1,121.52 mi (1,804.91 km) |
