| Monterey to Orbetello | 6,228.50 mi (10,023.79 km) |
| Monterey to Oria | 6,524.34 mi (10,499.91 km) |
| Monterey to Oristano | 6,287.09 mi (10,118.10 km) |
| Monterey to Orta Nova | 6,422.32 mi (10,335.72 km) |
| Monterey to Orte | 6,262.06 mi (10,077.82 km) |
| Monterey to Ortona | 6,326.41 mi (10,181.37 km) |
| Monterey to Orvieto | 6,239.41 mi (10,041.36 km) |
| Monterey to Orzinuovi | 6,026.01 mi (9,697.92 km) |
| Monterey to Osimo | 6,235.56 mi (10,035.16 km) |
| Monterey to Ospitaletto | 6,021.47 mi (9,690.62 km) |
| Monterey to Ostuni | 6,509.23 mi (10,475.59 km) |
| Monterey to Ottaviano | 6,414.85 mi (10,323.70 km) |
| Monterey to Ovada | 6,029.83 mi (9,704.07 km) |
| Monterey to Ozieri | 6,263.10 mi (10,079.48 km) |
| Monterey to Paceco | 6,520.15 mi (10,493.18 km) |
