| Seal Beach to Orbetello | 6,272.06 mi (10,093.91 km) |
| Seal Beach to Oria | 6,581.77 mi (10,592.33 km) |
| Seal Beach to Oristano | 6,314.91 mi (10,162.86 km) |
| Seal Beach to Orta Nova | 6,476.08 mi (10,422.25 km) |
| Seal Beach to Orte | 6,309.14 mi (10,153.57 km) |
| Seal Beach to Ortona | 6,379.14 mi (10,266.23 km) |
| Seal Beach to Orvieto | 6,286.46 mi (10,117.07 km) |
| Seal Beach to Orzinuovi | 6,075.18 mi (9,777.06 km) |
| Seal Beach to Osimo | 6,288.92 mi (10,121.03 km) |
| Seal Beach to Ospitaletto | 6,071.52 mi (9,771.16 km) |
| Seal Beach to Ostuni | 6,567.15 mi (10,568.80 km) |
| Seal Beach to Ottaviano | 6,463.42 mi (10,401.88 km) |
| Seal Beach to Ovada | 6,073.05 mi (9,773.63 km) |
| Seal Beach to Ozieri | 6,294.32 mi (10,129.73 km) |
| Seal Beach to Paceco | 6,554.11 mi (10,547.82 km) |
