| Gilbert to Orbetello | 6,079.61 mi (9,784.18 km) |
| Gilbert to Oria | 6,402.65 mi (10,304.08 km) |
| Gilbert to Oristano | 6,105.55 mi (9,825.94 km) |
| Gilbert to Orta Nova | 6,293.55 mi (10,128.49 km) |
| Gilbert to Orte | 6,120.27 mi (9,849.62 km) |
| Gilbert to Ortona | 6,196.05 mi (9,971.58 km) |
| Gilbert to Orvieto | 6,097.69 mi (9,813.29 km) |
| Gilbert to Orzinuovi | 5,890.02 mi (9,479.07 km) |
| Gilbert to Osimo | 6,107.07 mi (9,828.38 km) |
| Gilbert to Ospitaletto | 5,887.33 mi (9,474.75 km) |
| Gilbert to Ostuni | 6,388.66 mi (10,281.56 km) |
| Gilbert to Ottaviano | 6,275.26 mi (10,099.06 km) |
| Gilbert to Ovada | 5,881.41 mi (9,465.21 km) |
| Gilbert to Ozieri | 6,088.63 mi (9,798.70 km) |
| Gilbert to Paceco | 6,349.79 mi (10,218.99 km) |
