| Seclin to Octeville | 216.66 mi (348.68 km) |
| Seclin to Oignies | 5.69 mi (9.15 km) |
| Seclin to Oissel | 119.88 mi (192.93 km) |
| Seclin to Olivet | 192.34 mi (309.54 km) |
| Seclin to Ollioules | 528.83 mi (851.08 km) |
| Seclin to Olonne-sur-Mer | 353.55 mi (568.98 km) |
| Seclin to Oloron-Sainte-Marie | 536.19 mi (862.91 km) |
| Seclin to Onet Village | 427.67 mi (688.26 km) |
| Seclin to Onnaing | 27.36 mi (44.03 km) |
| Seclin to Orange | 450.63 mi (725.21 km) |
| Seclin to Orchies | 10.72 mi (17.25 km) |
| Seclin to Orleans | 189.66 mi (305.23 km) |
| Seclin to Orly | 127.88 mi (205.81 km) |
| Seclin to Ormesson-sur-Marne | 123.74 mi (199.14 km) |
| Seclin to Orsay | 133.27 mi (214.48 km) |
