| Valley Center to Orbetello | 6,266.50 mi (10,084.96 km) |
| Valley Center to Oria | 6,579.38 mi (10,588.49 km) |
| Valley Center to Oristano | 6,305.48 mi (10,147.68 km) |
| Valley Center to Orta Nova | 6,472.87 mi (10,417.08 km) |
| Valley Center to Orte | 6,304.41 mi (10,145.97 km) |
| Valley Center to Ortona | 6,375.75 mi (10,260.78 km) |
| Valley Center to Orvieto | 6,281.74 mi (10,109.49 km) |
| Valley Center to Orzinuovi | 6,071.16 mi (9,770.59 km) |
| Valley Center to Osimo | 6,285.75 mi (10,115.94 km) |
| Valley Center to Ospitaletto | 6,067.71 mi (9,765.04 km) |
| Valley Center to Ostuni | 6,564.89 mi (10,565.16 km) |
| Valley Center to Ottaviano | 6,458.94 mi (10,394.66 km) |
| Valley Center to Ovada | 6,067.57 mi (9,764.81 km) |
| Valley Center to Ozieri | 6,285.74 mi (10,115.91 km) |
| Valley Center to Paceco | 6,545.98 mi (10,534.73 km) |
