| Somma Lombardo to Orbetello | 256.48 mi (412.76 km) |
| Somma Lombardo to Oria | 575.09 mi (925.52 km) |
| Somma Lombardo to Oristano | 399.22 mi (642.49 km) |
| Somma Lombardo to Orta Nova | 462.17 mi (743.79 km) |
| Somma Lombardo to Orte | 288.16 mi (463.74 km) |
| Somma Lombardo to Ortona | 364.88 mi (587.22 km) |
| Somma Lombardo to Orvieto | 265.47 mi (427.23 km) |
| Somma Lombardo to Orzinuovi | 62.81 mi (101.08 km) |
| Somma Lombardo to Osimo | 280.13 mi (450.82 km) |
| Somma Lombardo to Ospitaletto | 66.95 mi (107.75 km) |
| Somma Lombardo to Ostuni | 562.55 mi (905.34 km) |
| Somma Lombardo to Ottaviano | 442.49 mi (712.12 km) |
| Somma Lombardo to Ovada | 72.19 mi (116.17 km) |
| Somma Lombardo to Ozieri | 352.60 mi (567.45 km) |
| Somma Lombardo to Paceco | 567.56 mi (913.39 km) |
