| McKeesport to Orbetello | 4,474.25 mi (7,200.61 km) |
| McKeesport to Oria | 4,823.99 mi (7,763.46 km) |
| McKeesport to Oristano | 4,453.27 mi (7,166.84 km) |
| McKeesport to Orta Nova | 4,709.03 mi (7,578.44 km) |
| McKeesport to Orte | 4,523.72 mi (7,280.22 km) |
| McKeesport to Ortona | 4,613.44 mi (7,424.62 km) |
| McKeesport to Orvieto | 4,502.24 mi (7,245.65 km) |
| McKeesport to Orzinuovi | 4,312.71 mi (6,940.64 km) |
| McKeesport to Osimo | 4,531.37 mi (7,292.54 km) |
| McKeesport to Ospitaletto | 4,313.07 mi (6,941.21 km) |
| McKeesport to Ostuni | 4,812.33 mi (7,744.70 km) |
| McKeesport to Ottaviano | 4,675.41 mi (7,524.34 km) |
| McKeesport to Ovada | 4,285.28 mi (6,896.49 km) |
| McKeesport to Ozieri | 4,446.51 mi (7,155.97 km) |
| McKeesport to Paceco | 4,703.91 mi (7,570.21 km) |
