| Seraing to Oignies | 110.37 mi (177.62 km) |
| Seraing to Oissel | 213.85 mi (344.17 km) |
| Seraing to Olivet | 248.30 mi (399.61 km) |
| Seraing to Ollioules | 514.58 mi (828.14 km) |
| Seraing to Olonne-sur-Mer | 434.16 mi (698.71 km) |
| Seraing to Oloron-Sainte-Marie | 585.87 mi (942.87 km) |
| Seraing to Onet Village | 450.44 mi (724.91 km) |
| Seraing to Onnaing | 84.69 mi (136.30 km) |
| Seraing to Orange | 446.47 mi (718.53 km) |
| Seraing to Orchies | 99.36 mi (159.90 km) |
| Seraing to Orleans | 246.00 mi (395.90 km) |
| Seraing to Orly | 188.28 mi (303.01 km) |
| Seraing to Ormesson-sur-Marne | 181.50 mi (292.10 km) |
| Seraing to Orsay | 197.28 mi (317.49 km) |
| Seraing to Orthez | 571.82 mi (920.26 km) |
