| Saint-Omer to Octeville | 189.26 mi (304.58 km) |
| Saint-Omer to Oignies | 37.47 mi (60.31 km) |
| Saint-Omer to Oissel | 110.15 mi (177.28 km) |
| Saint-Omer to Olivet | 199.95 mi (321.79 km) |
| Saint-Omer to Ollioules | 552.10 mi (888.51 km) |
| Saint-Omer to Olonne-sur-Mer | 344.28 mi (554.07 km) |
| Saint-Omer to Oloron-Sainte-Marie | 539.05 mi (867.52 km) |
| Saint-Omer to Onet Village | 441.27 mi (710.16 km) |
| Saint-Omer to Onnaing | 63.75 mi (102.60 km) |
| Saint-Omer to Orange | 471.91 mi (759.46 km) |
| Saint-Omer to Orchies | 47.08 mi (75.77 km) |
| Saint-Omer to Orleans | 197.26 mi (317.46 km) |
| Saint-Omer to Orly | 138.62 mi (223.08 km) |
| Saint-Omer to Ormesson-sur-Marne | 136.16 mi (219.13 km) |
| Saint-Omer to Orsay | 141.69 mi (228.03 km) |
