| Suisun City to Orbetello | 6,135.90 mi (9,874.78 km) |
| Suisun City to Oria | 6,428.38 mi (10,345.48 km) |
| Suisun City to Oristano | 6,198.27 mi (9,975.15 km) |
| Suisun City to Orta Nova | 6,327.24 mi (10,182.71 km) |
| Suisun City to Orte | 6,168.62 mi (9,927.44 km) |
| Suisun City to Ortona | 6,231.64 mi (10,028.85 km) |
| Suisun City to Orvieto | 6,145.99 mi (9,891.02 km) |
| Suisun City to Orzinuovi | 5,932.26 mi (9,547.05 km) |
| Suisun City to Osimo | 6,140.71 mi (9,882.52 km) |
| Suisun City to Ospitaletto | 5,927.53 mi (9,539.44 km) |
| Suisun City to Ostuni | 6,413.17 mi (10,321.01 km) |
| Suisun City to Ottaviano | 6,320.95 mi (10,172.59 km) |
| Suisun City to Ovada | 5,937.47 mi (9,555.43 km) |
| Suisun City to Ozieri | 6,173.45 mi (9,935.20 km) |
| Suisun City to Paceco | 6,429.63 mi (10,347.48 km) |
