| Missoula to Orbetello | 5,415.31 mi (8,715.10 km) |
| Missoula to Oria | 5,708.19 mi (9,186.44 km) |
| Missoula to Oristano | 5,479.34 mi (8,818.15 km) |
| Missoula to Orta Nova | 5,606.75 mi (9,023.19 km) |
| Missoula to Orte | 5,447.95 mi (8,767.62 km) |
| Missoula to Ortona | 5,511.07 mi (8,869.21 km) |
| Missoula to Orvieto | 5,425.32 mi (8,731.21 km) |
| Missoula to Orzinuovi | 5,211.58 mi (8,387.23 km) |
| Missoula to Osimo | 5,420.16 mi (8,722.90 km) |
| Missoula to Ospitaletto | 5,206.85 mi (8,379.62 km) |
| Missoula to Ostuni | 5,693.02 mi (9,162.03 km) |
| Missoula to Ottaviano | 5,600.28 mi (9,012.78 km) |
| Missoula to Ovada | 5,216.93 mi (8,395.83 km) |
| Missoula to Ozieri | 5,453.99 mi (8,777.35 km) |
| Missoula to Paceco | 5,709.67 mi (9,188.83 km) |
