| Seaford to Orbetello | 779.08 mi (1,253.80 km) |
| Seaford to Oria | 1,100.10 mi (1,770.43 km) |
| Seaford to Oristano | 855.17 mi (1,376.26 km) |
| Seaford to Orta Nova | 989.24 mi (1,592.02 km) |
| Seaford to Orte | 816.31 mi (1,313.72 km) |
| Seaford to Ortona | 891.69 mi (1,435.04 km) |
| Seaford to Orvieto | 793.65 mi (1,277.26 km) |
| Seaford to Orzinuovi | 585.38 mi (942.08 km) |
| Seaford to Osimo | 803.70 mi (1,293.43 km) |
| Seaford to Ospitaletto | 583.17 mi (938.53 km) |
| Seaford to Ostuni | 1,086.72 mi (1,748.91 km) |
| Seaford to Ottaviano | 971.05 mi (1,562.76 km) |
| Seaford to Ovada | 580.07 mi (933.54 km) |
| Seaford to Ozieri | 823.26 mi (1,324.90 km) |
| Seaford to Paceco | 1,073.19 mi (1,727.13 km) |
