| University of California-Santa Barbara to Orbetello | 6,291.97 mi (10,125.94 km) |
| University of California-Santa Barbara to Oria | 6,596.51 mi (10,616.06 km) |
| University of California-Santa Barbara to Oristano | 6,340.82 mi (10,204.56 km) |
| University of California-Santa Barbara to Orta Nova | 6,492.19 mi (10,448.17 km) |
| University of California-Santa Barbara to Orte | 6,327.72 mi (10,183.48 km) |
| University of California-Santa Barbara to Ortona | 6,395.58 mi (10,292.70 km) |
| University of California-Santa Barbara to Orvieto | 6,305.03 mi (10,146.97 km) |
| University of California-Santa Barbara to Orzinuovi | 6,092.81 mi (9,805.43 km) |
| University of California-Santa Barbara to Osimo | 6,305.06 mi (10,147.01 km) |
| University of California-Santa Barbara to Ospitaletto | 6,088.81 mi (9,798.99 km) |
| University of California-Santa Barbara to Ostuni | 6,581.69 mi (10,592.21 km) |
| University of California-Santa Barbara to Ottaviano | 6,481.53 mi (10,431.01 km) |
| University of California-Santa Barbara to Ovada | 6,092.96 mi (9,805.68 km) |
| University of California-Santa Barbara to Ozieri | 6,318.93 mi (10,169.34 km) |
| University of California-Santa Barbara to Paceco | 6,577.85 mi (10,586.03 km) |
