| Sines to Orbetello | 1,100.95 mi (1,771.80 km) |
| Sines to Oria | 1,423.66 mi (2,291.17 km) |
| Sines to Oristano | 946.31 mi (1,522.94 km) |
| Sines to Orta Nova | 1,323.56 mi (2,130.06 km) |
| Sines to Orte | 1,160.27 mi (1,867.27 km) |
| Sines to Ortona | 1,261.22 mi (2,029.73 km) |
| Sines to Orvieto | 1,149.20 mi (1,849.46 km) |
| Sines to Orzinuovi | 1,094.28 mi (1,761.07 km) |
| Sines to Osimo | 1,226.63 mi (1,974.07 km) |
| Sines to Ospitaletto | 1,104.53 mi (1,777.56 km) |
| Sines to Ostuni | 1,420.70 mi (2,286.40 km) |
| Sines to Ottaviano | 1,258.30 mi (2,025.03 km) |
| Sines to Ovada | 1,016.68 mi (1,636.19 km) |
| Sines to Ozieri | 971.09 mi (1,562.82 km) |
| Sines to Paceco | 1,163.84 mi (1,873.02 km) |
