| Crystal to Orbetello | 4,818.63 mi (7,754.83 km) |
| Crystal to Oria | 5,148.32 mi (8,285.42 km) |
| Crystal to Oristano | 4,837.99 mi (7,785.99 km) |
| Crystal to Orta Nova | 5,037.46 mi (8,107.01 km) |
| Crystal to Orte | 4,861.05 mi (7,823.10 km) |
| Crystal to Ortona | 4,939.93 mi (7,950.04 km) |
| Crystal to Orvieto | 4,838.59 mi (7,786.96 km) |
| Crystal to Orzinuovi | 4,633.59 mi (7,457.04 km) |
| Crystal to Osimo | 4,851.99 mi (7,808.52 km) |
| Crystal to Ospitaletto | 4,631.51 mi (7,453.70 km) |
| Crystal to Ostuni | 5,134.78 mi (8,263.63 km) |
| Crystal to Ottaviano | 5,016.03 mi (8,072.51 km) |
| Crystal to Ovada | 4,621.32 mi (7,437.29 km) |
| Crystal to Ozieri | 4,822.17 mi (7,760.54 km) |
| Crystal to Paceco | 5,083.44 mi (8,181.01 km) |
