| Uniondale to Orbetello | 4,187.41 mi (6,738.99 km) |
| Uniondale to Oria | 4,540.34 mi (7,306.98 km) |
| Uniondale to Oristano | 4,156.87 mi (6,689.83 km) |
| Uniondale to Orta Nova | 4,424.95 mi (7,121.26 km) |
| Uniondale to Orte | 4,238.38 mi (6,821.01 km) |
| Uniondale to Ortona | 4,330.37 mi (6,969.06 km) |
| Uniondale to Orvieto | 4,217.26 mi (6,787.03 km) |
| Uniondale to Orzinuovi | 4,032.83 mi (6,490.21 km) |
| Uniondale to Osimo | 4,250.26 mi (6,840.14 km) |
| Uniondale to Ospitaletto | 4,033.82 mi (6,491.81 km) |
| Uniondale to Ostuni | 4,529.22 mi (7,289.07 km) |
| Uniondale to Ottaviano | 4,388.46 mi (7,062.54 km) |
| Uniondale to Ovada | 4,001.60 mi (6,439.96 km) |
| Uniondale to Ozieri | 4,152.24 mi (6,682.39 km) |
| Uniondale to Paceco | 4,407.59 mi (7,093.34 km) |
