| Defiance to Orbetello | 4,626.79 mi (7,446.11 km) |
| Defiance to Oria | 4,971.96 mi (8,001.59 km) |
| Defiance to Oristano | 4,617.29 mi (7,430.81 km) |
| Defiance to Orta Nova | 4,857.78 mi (7,817.85 km) |
| Defiance to Orte | 4,674.40 mi (7,522.72 km) |
| Defiance to Ortona | 4,761.30 mi (7,662.58 km) |
| Defiance to Orvieto | 4,652.56 mi (7,487.57 km) |
| Defiance to Orzinuovi | 4,457.84 mi (7,174.20 km) |
| Defiance to Osimo | 4,677.24 mi (7,527.28 km) |
| Defiance to Ospitaletto | 4,457.48 mi (7,173.63 km) |
| Defiance to Ostuni | 4,959.71 mi (7,981.88 km) |
| Defiance to Ottaviano | 4,827.56 mi (7,769.21 km) |
| Defiance to Ovada | 4,434.72 mi (7,137.00 km) |
| Defiance to Ozieri | 4,607.93 mi (7,415.75 km) |
| Defiance to Paceco | 4,867.26 mi (7,833.10 km) |
