| Grande-Synthe to Oignies | 48.26 mi (77.66 km) |
| Grande-Synthe to Oissel | 127.35 mi (204.95 km) |
| Grande-Synthe to Olivet | 218.39 mi (351.47 km) |
| Grande-Synthe to Ollioules | 568.88 mi (915.53 km) |
| Grande-Synthe to Olonne-sur-Mer | 360.64 mi (580.40 km) |
| Grande-Synthe to Oloron-Sainte-Marie | 557.23 mi (896.77 km) |
| Grande-Synthe to Onet Village | 459.55 mi (739.58 km) |
| Grande-Synthe to Onnaing | 71.30 mi (114.75 km) |
| Grande-Synthe to Orange | 489.14 mi (787.19 km) |
| Grande-Synthe to Orchies | 55.51 mi (89.34 km) |
| Grande-Synthe to Orleans | 215.70 mi (347.14 km) |
| Grande-Synthe to Orly | 156.89 mi (252.49 km) |
| Grande-Synthe to Ormesson-sur-Marne | 154.30 mi (248.33 km) |
| Grande-Synthe to Orsay | 160.09 mi (257.64 km) |
| Grande-Synthe to Orthez | 539.47 mi (868.19 km) |
