| Montesilvano to Oria | 227.70 mi (366.45 km) |
| Montesilvano to Oristano | 340.38 mi (547.79 km) |
| Montesilvano to Orta Nova | 114.60 mi (184.43 km) |
| Montesilvano to Orte | 89.92 mi (144.71 km) |
| Montesilvano to Ortona | 17.09 mi (27.50 km) |
| Montesilvano to Orvieto | 104.63 mi (168.39 km) |
| Montesilvano to Orzinuovi | 289.28 mi (465.56 km) |
| Montesilvano to Osimo | 74.94 mi (120.61 km) |
| Montesilvano to Ospitaletto | 291.72 mi (469.47 km) |
| Montesilvano to Ostuni | 215.83 mi (347.35 km) |
| Montesilvano to Ottaviano | 116.22 mi (187.05 km) |
| Montesilvano to Ovada | 312.04 mi (502.18 km) |
| Montesilvano to Ozieri | 297.54 mi (478.85 km) |
| Montesilvano to Paceco | 324.20 mi (521.75 km) |
| Montesilvano to Pachino | 403.74 mi (649.76 km) |
