| Ukiah to Orbetello | 6,117.83 mi (9,845.69 km) |
| Ukiah to Oria | 6,405.67 mi (10,308.92 km) |
| Ukiah to Oristano | 6,184.93 mi (9,953.69 km) |
| Ukiah to Orta Nova | 6,305.78 mi (10,148.18 km) |
| Ukiah to Orte | 6,149.43 mi (9,896.55 km) |
| Ukiah to Ortona | 6,210.63 mi (9,995.04 km) |
| Ukiah to Orvieto | 6,126.84 mi (9,860.20 km) |
| Ukiah to Orzinuovi | 5,912.76 mi (9,515.67 km) |
| Ukiah to Osimo | 6,119.64 mi (9,848.60 km) |
| Ukiah to Ospitaletto | 5,907.77 mi (9,507.63 km) |
| Ukiah to Ostuni | 6,390.33 mi (10,284.25 km) |
| Ukiah to Ottaviano | 6,301.09 mi (10,140.62 km) |
| Ukiah to Ovada | 5,919.78 mi (9,526.97 km) |
| Ukiah to Ozieri | 6,159.10 mi (9,912.11 km) |
| Ukiah to Paceco | 6,414.07 mi (10,322.44 km) |
