| Mairena del Aljarafe to Orbetello | 979.45 mi (1,576.28 km) |
| Mairena del Aljarafe to Oria | 1,288.69 mi (2,073.95 km) |
| Mairena del Aljarafe to Oristano | 810.00 mi (1,303.58 km) |
| Mairena del Aljarafe to Orta Nova | 1,192.75 mi (1,919.54 km) |
| Mairena del Aljarafe to Orte | 1,037.73 mi (1,670.06 km) |
| Mairena del Aljarafe to Ortona | 1,136.47 mi (1,828.97 km) |
| Mairena del Aljarafe to Orvieto | 1,028.59 mi (1,655.35 km) |
| Mairena del Aljarafe to Orzinuovi | 996.62 mi (1,603.90 km) |
| Mairena del Aljarafe to Osimo | 1,109.46 mi (1,785.50 km) |
| Mairena del Aljarafe to Ospitaletto | 1,007.70 mi (1,621.73 km) |
| Mairena del Aljarafe to Ostuni | 1,286.76 mi (2,070.85 km) |
| Mairena del Aljarafe to Ottaviano | 1,125.37 mi (1,811.10 km) |
| Mairena del Aljarafe to Ovada | 916.34 mi (1,474.71 km) |
| Mairena del Aljarafe to Ozieri | 839.05 mi (1,350.32 km) |
| Mairena del Aljarafe to Paceco | 1,017.61 mi (1,637.68 km) |
