| Somma Vesuviana to Orbetello | 198.54 mi (319.52 km) |
| Somma Vesuviana to Oria | 169.42 mi (272.66 km) |
| Somma Vesuviana to Oristano | 314.71 mi (506.48 km) |
| Somma Vesuviana to Orta Nova | 73.52 mi (118.33 km) |
| Somma Vesuviana to Orte | 152.44 mi (245.32 km) |
| Somma Vesuviana to Ortona | 102.10 mi (164.32 km) |
| Somma Vesuviana to Orvieto | 174.99 mi (281.62 km) |
| Somma Vesuviana to Orzinuovi | 386.40 mi (621.85 km) |
| Somma Vesuviana to Osimo | 186.88 mi (300.75 km) |
| Somma Vesuviana to Ospitaletto | 390.97 mi (629.20 km) |
| Somma Vesuviana to Ostuni | 164.83 mi (265.27 km) |
| Somma Vesuviana to Ottaviano | 2.63 mi (4.23 km) |
| Somma Vesuviana to Ovada | 392.28 mi (631.32 km) |
| Somma Vesuviana to Ozieri | 285.15 mi (458.90 km) |
| Somma Vesuviana to Paceco | 223.57 mi (359.80 km) |
