| Oakland to Orbetello | 6,168.60 mi (9,927.40 km) |
| Oakland to Oria | 6,461.42 mi (10,398.65 km) |
| Oakland to Oristano | 6,230.52 mi (10,027.05 km) |
| Oakland to Orta Nova | 6,360.20 mi (10,235.75 km) |
| Oakland to Orte | 6,201.41 mi (9,980.21 km) |
| Oakland to Ortona | 6,264.56 mi (10,081.84 km) |
| Oakland to Orvieto | 6,178.78 mi (9,943.79 km) |
| Oakland to Orzinuovi | 5,965.08 mi (9,599.87 km) |
| Oakland to Osimo | 6,173.64 mi (9,935.51 km) |
| Oakland to Ospitaletto | 5,960.37 mi (9,592.28 km) |
| Oakland to Ostuni | 6,446.22 mi (10,374.19 km) |
| Oakland to Ottaviano | 6,353.79 mi (10,225.44 km) |
| Oakland to Ovada | 5,970.14 mi (9,608.00 km) |
| Oakland to Ozieri | 6,205.80 mi (9,987.27 km) |
| Oakland to Paceco | 6,462.09 mi (10,399.73 km) |
