| Horta to Orbetello | 2,091.82 mi (3,366.45 km) |
| Horta to Oria | 2,441.37 mi (3,929.00 km) |
| Horta to Oristano | 1,980.38 mi (3,187.12 km) |
| Horta to Orta Nova | 2,331.77 mi (3,752.63 km) |
| Horta to Orte | 2,151.10 mi (3,461.86 km) |
| Horta to Ortona | 2,253.97 mi (3,627.41 km) |
| Horta to Orvieto | 2,135.14 mi (3,436.18 km) |
| Horta to Orzinuovi | 2,016.69 mi (3,245.54 km) |
| Horta to Osimo | 2,198.53 mi (3,538.19 km) |
| Horta to Ospitaletto | 2,023.44 mi (3,256.42 km) |
| Horta to Ostuni | 2,435.44 mi (3,919.46 km) |
| Horta to Ottaviano | 2,274.48 mi (3,660.41 km) |
| Horta to Ovada | 1,954.26 mi (3,145.08 km) |
| Horta to Ozieri | 1,994.60 mi (3,210.00 km) |
| Horta to Paceco | 2,215.66 mi (3,565.76 km) |
