| Porto de Mos to Orbetello | 1,059.79 mi (1,705.56 km) |
| Porto de Mos to Oria | 1,395.09 mi (2,245.18 km) |
| Porto de Mos to Oristano | 923.53 mi (1,486.27 km) |
| Porto de Mos to Orta Nova | 1,290.57 mi (2,076.97 km) |
| Porto de Mos to Orte | 1,119.60 mi (1,801.82 km) |
| Porto de Mos to Ortona | 1,222.00 mi (1,966.62 km) |
| Porto de Mos to Orvieto | 1,106.70 mi (1,781.07 km) |
| Porto de Mos to Orzinuovi | 1,032.65 mi (1,661.90 km) |
| Porto de Mos to Osimo | 1,180.17 mi (1,899.30 km) |
| Porto de Mos to Ospitaletto | 1,042.19 mi (1,677.24 km) |
| Porto de Mos to Ostuni | 1,390.86 mi (2,238.37 km) |
| Porto de Mos to Ottaviano | 1,228.28 mi (1,976.72 km) |
| Porto de Mos to Ovada | 957.91 mi (1,541.61 km) |
| Porto de Mos to Ozieri | 942.77 mi (1,517.24 km) |
| Porto de Mos to Paceco | 1,153.38 mi (1,856.19 km) |
