| Siran to Orbetello | 1,450.36 mi (2,334.12 km) |
| Siran to Oria | 1,129.25 mi (1,817.35 km) |
| Siran to Oristano | 1,607.13 mi (2,586.43 km) |
| Siran to Orta Nova | 1,224.24 mi (1,970.23 km) |
| Siran to Orte | 1,390.53 mi (2,237.84 km) |
| Siran to Ortona | 1,288.14 mi (2,073.07 km) |
| Siran to Orvieto | 1,403.83 mi (2,259.24 km) |
| Siran to Orzinuovi | 1,514.22 mi (2,436.90 km) |
| Siran to Osimo | 1,334.06 mi (2,146.96 km) |
| Siran to Ospitaletto | 1,508.12 mi (2,427.08 km) |
| Siran to Ostuni | 1,130.30 mi (1,819.04 km) |
| Siran to Ottaviano | 1,291.19 mi (2,077.97 km) |
| Siran to Ovada | 1,575.28 mi (2,535.17 km) |
| Siran to Ozieri | 1,577.76 mi (2,539.16 km) |
| Siran to Paceco | 1,428.06 mi (2,298.24 km) |
