| Seaham to Oberkirch | 592.98 mi (954.32 km) |
| Seaham to Obernburg am Main | 560.38 mi (901.85 km) |
| Seaham to Obernkirchen | 464.06 mi (746.83 km) |
| Seaham to Oberschleissheim | 715.64 mi (1,151.71 km) |
| Seaham to Oberstdorf | 717.58 mi (1,154.83 km) |
| Seaham to Obertraubling | 702.58 mi (1,130.69 km) |
| Seaham to Obertshausen | 539.73 mi (868.62 km) |
| Seaham to Oberursel | 524.97 mi (844.86 km) |
| Seaham to Ochsenfurt | 600.01 mi (965.63 km) |
| Seaham to Ochsenhausen | 672.91 mi (1,082.94 km) |
| Seaham to Ochtrup | 394.49 mi (634.86 km) |
| Seaham to Odenthal | 439.05 mi (706.58 km) |
| Seaham to Oelde | 442.72 mi (712.48 km) |
| Seaham to Oelsnitz | 642.15 mi (1,033.43 km) |
| Seaham to Oer-Erkenschwick | 417.90 mi (672.54 km) |
