| West Mifflin to Orbetello | 4,476.32 mi (7,203.94 km) |
| West Mifflin to Oria | 4,826.00 mi (7,766.69 km) |
| West Mifflin to Oristano | 4,455.51 mi (7,170.44 km) |
| West Mifflin to Orta Nova | 4,711.04 mi (7,581.69 km) |
| West Mifflin to Orte | 4,525.76 mi (7,283.50 km) |
| West Mifflin to Ortona | 4,615.44 mi (7,427.84 km) |
| West Mifflin to Orvieto | 4,504.27 mi (7,248.92 km) |
| West Mifflin to Orzinuovi | 4,314.66 mi (6,943.78 km) |
| West Mifflin to Osimo | 4,533.34 mi (7,295.70 km) |
| West Mifflin to Ospitaletto | 4,315.01 mi (6,944.34 km) |
| West Mifflin to Ostuni | 4,814.33 mi (7,747.91 km) |
| West Mifflin to Ottaviano | 4,677.47 mi (7,527.67 km) |
| West Mifflin to Ovada | 4,287.29 mi (6,899.73 km) |
| West Mifflin to Ozieri | 4,448.71 mi (7,159.51 km) |
| West Mifflin to Paceco | 4,706.14 mi (7,573.80 km) |
