| Silleda to Orbetello | 987.46 mi (1,589.16 km) |
| Silleda to Oria | 1,339.79 mi (2,156.18 km) |
| Silleda to Oristano | 892.76 mi (1,436.76 km) |
| Silleda to Orta Nova | 1,228.68 mi (1,977.37 km) |
| Silleda to Orte | 1,046.54 mi (1,684.25 km) |
| Silleda to Ortona | 1,149.30 mi (1,849.62 km) |
| Silleda to Orvieto | 1,030.34 mi (1,658.17 km) |
| Silleda to Orzinuovi | 919.12 mi (1,479.19 km) |
| Silleda to Osimo | 1,093.96 mi (1,760.56 km) |
| Silleda to Ospitaletto | 926.90 mi (1,491.71 km) |
| Silleda to Ostuni | 1,333.16 mi (2,145.51 km) |
| Silleda to Ottaviano | 1,173.61 mi (1,888.75 km) |
| Silleda to Ovada | 852.59 mi (1,372.11 km) |
| Silleda to Ozieri | 900.27 mi (1,448.85 km) |
| Silleda to Paceco | 1,138.63 mi (1,832.44 km) |
