| Trabzon to Orbetello | 1,466.68 mi (2,360.39 km) |
| Trabzon to Oria | 1,153.60 mi (1,856.55 km) |
| Trabzon to Oristano | 1,629.75 mi (2,622.83 km) |
| Trabzon to Orta Nova | 1,245.08 mi (2,003.75 km) |
| Trabzon to Orte | 1,406.98 mi (2,264.32 km) |
| Trabzon to Ortona | 1,305.25 mi (2,100.59 km) |
| Trabzon to Orvieto | 1,419.43 mi (2,284.36 km) |
| Trabzon to Orzinuovi | 1,521.57 mi (2,448.73 km) |
| Trabzon to Osimo | 1,347.31 mi (2,168.29 km) |
| Trabzon to Ospitaletto | 1,514.99 mi (2,438.15 km) |
| Trabzon to Ostuni | 1,153.79 mi (1,856.85 km) |
| Trabzon to Ottaviano | 1,313.28 mi (2,113.52 km) |
| Trabzon to Ovada | 1,584.89 mi (2,550.63 km) |
| Trabzon to Ozieri | 1,598.75 mi (2,572.94 km) |
| Trabzon to Paceco | 1,457.75 mi (2,346.03 km) |
