| Casas Adobes to Orbetello | 6,105.41 mi (9,825.71 km) |
| Casas Adobes to Oria | 6,431.31 mi (10,350.20 km) |
| Casas Adobes to Oristano | 6,127.14 mi (9,860.67 km) |
| Casas Adobes to Orta Nova | 6,321.51 mi (10,173.49 km) |
| Casas Adobes to Orte | 6,146.89 mi (9,892.46 km) |
| Casas Adobes to Ortona | 6,223.97 mi (10,016.52 km) |
| Casas Adobes to Orvieto | 6,124.36 mi (9,856.21 km) |
| Casas Adobes to Orzinuovi | 5,917.74 mi (9,523.68 km) |
| Casas Adobes to Osimo | 6,135.37 mi (9,873.92 km) |
| Casas Adobes to Ospitaletto | 5,915.29 mi (9,519.73 km) |
| Casas Adobes to Ostuni | 6,417.48 mi (10,327.94 km) |
| Casas Adobes to Ottaviano | 6,301.91 mi (10,141.95 km) |
| Casas Adobes to Ovada | 5,907.59 mi (9,507.35 km) |
| Casas Adobes to Ozieri | 6,111.16 mi (9,834.96 km) |
| Casas Adobes to Paceco | 6,372.42 mi (10,255.41 km) |
