| Silves to Orbetello | 1,101.24 mi (1,772.27 km) |
| Silves to Oria | 1,416.28 mi (2,279.28 km) |
| Silves to Oristano | 937.73 mi (1,509.14 km) |
| Silves to Orta Nova | 1,318.75 mi (2,122.32 km) |
| Silves to Orte | 1,160.06 mi (1,866.94 km) |
| Silves to Ortona | 1,259.90 mi (2,027.61 km) |
| Silves to Orvieto | 1,150.02 mi (1,850.77 km) |
| Silves to Orzinuovi | 1,105.93 mi (1,779.82 km) |
| Silves to Osimo | 1,229.33 mi (1,978.41 km) |
| Silves to Ospitaletto | 1,116.55 mi (1,796.92 km) |
| Silves to Ostuni | 1,413.99 mi (2,275.59 km) |
| Silves to Ottaviano | 1,252.13 mi (2,015.11 km) |
| Silves to Ovada | 1,027.02 mi (1,652.82 km) |
| Silves to Ozieri | 965.22 mi (1,553.38 km) |
| Silves to Paceco | 1,148.09 mi (1,847.67 km) |
