| Ortahisar to Orbetello | 1,265.42 mi (2,036.50 km) |
| Ortahisar to Oria | 925.49 mi (1,489.44 km) |
| Ortahisar to Oristano | 1,403.22 mi (2,258.26 km) |
| Ortahisar to Orta Nova | 1,029.04 mi (1,656.08 km) |
| Ortahisar to Orte | 1,205.90 mi (1,940.70 km) |
| Ortahisar to Ortona | 1,102.92 mi (1,774.97 km) |
| Ortahisar to Orvieto | 1,221.55 mi (1,965.90 km) |
| Ortahisar to Orzinuovi | 1,356.24 mi (2,182.65 km) |
| Ortahisar to Osimo | 1,159.88 mi (1,866.64 km) |
| Ortahisar to Ospitaletto | 1,351.76 mi (2,175.45 km) |
| Ortahisar to Ostuni | 928.94 mi (1,494.99 km) |
| Ortahisar to Ottaviano | 1,091.59 mi (1,756.75 km) |
| Ortahisar to Ovada | 1,409.38 mi (2,268.17 km) |
| Ortahisar to Ozieri | 1,378.42 mi (2,218.36 km) |
| Ortahisar to Paceco | 1,207.75 mi (1,943.69 km) |
