| Ilhavo to Orbetello | 1,033.81 mi (1,663.75 km) |
| Ilhavo to Oria | 1,375.58 mi (2,213.78 km) |
| Ilhavo to Oristano | 909.87 mi (1,464.29 km) |
| Ilhavo to Orta Nova | 1,268.69 mi (2,041.75 km) |
| Ilhavo to Orte | 1,093.64 mi (1,760.04 km) |
| Ilhavo to Ortona | 1,196.52 mi (1,925.61 km) |
| Ilhavo to Orvieto | 1,079.66 mi (1,737.55 km) |
| Ilhavo to Orzinuovi | 993.93 mi (1,599.57 km) |
| Ilhavo to Osimo | 1,150.35 mi (1,851.30 km) |
| Ilhavo to Ospitaletto | 1,002.97 mi (1,614.12 km) |
| Ilhavo to Ostuni | 1,370.58 mi (2,205.74 km) |
| Ilhavo to Ottaviano | 1,208.47 mi (1,944.84 km) |
| Ilhavo to Ovada | 921.35 mi (1,482.77 km) |
| Ilhavo to Ozieri | 925.52 mi (1,489.48 km) |
| Ilhavo to Paceco | 1,145.97 mi (1,844.26 km) |
