| Rancho Cucamonga to Orbetello | 6,234.50 mi (10,033.46 km) |
| Rancho Cucamonga to Oria | 6,544.66 mi (10,532.61 km) |
| Rancho Cucamonga to Oristano | 6,276.91 mi (10,101.70 km) |
| Rancho Cucamonga to Orta Nova | 6,438.85 mi (10,362.33 km) |
| Rancho Cucamonga to Orte | 6,271.69 mi (10,093.30 km) |
| Rancho Cucamonga to Ortona | 6,341.88 mi (10,206.26 km) |
| Rancho Cucamonga to Orvieto | 6,249.01 mi (10,056.80 km) |
| Rancho Cucamonga to Orzinuovi | 6,037.82 mi (9,716.94 km) |
| Rancho Cucamonga to Osimo | 6,251.68 mi (10,061.11 km) |
| Rancho Cucamonga to Ospitaletto | 6,034.19 mi (9,711.09 km) |
| Rancho Cucamonga to Ostuni | 6,530.05 mi (10,509.11 km) |
| Rancho Cucamonga to Ottaviano | 6,426.01 mi (10,341.66 km) |
| Rancho Cucamonga to Ovada | 6,035.50 mi (9,713.20 km) |
| Rancho Cucamonga to Ozieri | 6,256.41 mi (10,068.72 km) |
| Rancho Cucamonga to Paceco | 6,516.25 mi (10,486.89 km) |
