| Seaham to Orbetello | 1,027.40 mi (1,653.44 km) |
| Seaham to Oria | 1,318.43 mi (2,121.80 km) |
| Seaham to Oristano | 1,129.08 mi (1,817.07 km) |
| Seaham to Orta Nova | 1,214.29 mi (1,954.22 km) |
| Seaham to Orte | 1,056.26 mi (1,699.88 km) |
| Seaham to Ortona | 1,118.15 mi (1,799.49 km) |
| Seaham to Orvieto | 1,033.74 mi (1,663.64 km) |
| Seaham to Orzinuovi | 819.37 mi (1,318.66 km) |
| Seaham to Osimo | 1,027.36 mi (1,653.37 km) |
| Seaham to Ospitaletto | 814.18 mi (1,310.30 km) |
| Seaham to Ostuni | 1,303.73 mi (2,098.15 km) |
| Seaham to Ottaviano | 1,207.46 mi (1,943.22 km) |
| Seaham to Ovada | 832.21 mi (1,339.31 km) |
| Seaham to Ozieri | 1,093.36 mi (1,759.59 km) |
| Seaham to Paceco | 1,333.98 mi (2,146.84 km) |
