| Sidney to Orbetello | 4,659.92 mi (7,499.41 km) |
| Sidney to Oria | 5,006.60 mi (8,057.34 km) |
| Sidney to Oristano | 4,646.65 mi (7,478.06 km) |
| Sidney to Orta Nova | 4,892.15 mi (7,873.15 km) |
| Sidney to Orte | 4,708.12 mi (7,576.98 km) |
| Sidney to Ortona | 4,795.92 mi (7,718.28 km) |
| Sidney to Orvieto | 4,686.38 mi (7,542.01 km) |
| Sidney to Orzinuovi | 4,493.18 mi (7,231.07 km) |
| Sidney to Osimo | 4,712.43 mi (7,583.92 km) |
| Sidney to Ospitaletto | 4,493.04 mi (7,230.84 km) |
| Sidney to Ostuni | 4,994.53 mi (8,037.92 km) |
| Sidney to Ottaviano | 4,860.87 mi (7,822.81 km) |
| Sidney to Ovada | 4,468.75 mi (7,191.75 km) |
| Sidney to Ozieri | 4,638.17 mi (7,464.42 km) |
| Sidney to Paceco | 4,896.92 mi (7,880.83 km) |
