| Montalegre to Orbetello | 972.68 mi (1,565.37 km) |
| Montalegre to Oria | 1,320.86 mi (2,125.72 km) |
| Montalegre to Oristano | 864.89 mi (1,391.91 km) |
| Montalegre to Orta Nova | 1,211.47 mi (1,949.67 km) |
| Montalegre to Orte | 1,032.25 mi (1,661.24 km) |
| Montalegre to Ortona | 1,135.26 mi (1,827.03 km) |
| Montalegre to Orvieto | 1,017.05 mi (1,636.79 km) |
| Montalegre to Orzinuovi | 918.36 mi (1,477.96 km) |
| Montalegre to Osimo | 1,084.19 mi (1,744.83 km) |
| Montalegre to Ospitaletto | 926.83 mi (1,491.59 km) |
| Montalegre to Ostuni | 1,314.95 mi (2,116.20 km) |
| Montalegre to Ottaviano | 1,154.00 mi (1,857.19 km) |
| Montalegre to Ovada | 848.48 mi (1,365.50 km) |
| Montalegre to Ozieri | 875.84 mi (1,409.52 km) |
| Montalegre to Paceco | 1,107.46 mi (1,782.28 km) |
