| Cleveland to Orbetello | 4,506.73 mi (7,252.89 km) |
| Cleveland to Oria | 4,853.74 mi (7,811.33 km) |
| Cleveland to Oristano | 4,493.06 mi (7,230.88 km) |
| Cleveland to Orta Nova | 4,739.22 mi (7,627.05 km) |
| Cleveland to Orte | 4,555.05 mi (7,330.65 km) |
| Cleveland to Ortona | 4,643.06 mi (7,472.28 km) |
| Cleveland to Orvieto | 4,533.34 mi (7,295.71 km) |
| Cleveland to Orzinuovi | 4,340.53 mi (6,985.41 km) |
| Cleveland to Osimo | 4,559.72 mi (7,338.16 km) |
| Cleveland to Ospitaletto | 4,340.45 mi (6,985.28 km) |
| Cleveland to Ostuni | 4,841.71 mi (7,791.98 km) |
| Cleveland to Ottaviano | 4,707.71 mi (7,576.33 km) |
| Cleveland to Ovada | 4,315.76 mi (6,945.54 km) |
| Cleveland to Ozieri | 4,484.62 mi (7,217.31 km) |
| Cleveland to Paceco | 4,743.34 mi (7,633.67 km) |
