| Brest to Oignies | 365.48 mi (588.18 km) |
| Brest to Oissel | 262.00 mi (421.65 km) |
| Brest to Olivet | 296.87 mi (477.77 km) |
| Brest to Ollioules | 615.45 mi (990.48 km) |
| Brest to Olonne-sur-Mer | 180.30 mi (290.17 km) |
| Brest to Oloron-Sainte-Marie | 404.69 mi (651.28 km) |
| Brest to Onet Village | 437.09 mi (703.44 km) |
| Brest to Onnaing | 388.82 mi (625.74 km) |
| Brest to Orange | 531.99 mi (856.15 km) |
| Brest to Orchies | 375.97 mi (605.06 km) |
| Brest to Orleans | 296.83 mi (477.70 km) |
| Brest to Orly | 315.54 mi (507.81 km) |
| Brest to Ormesson-sur-Marne | 322.26 mi (518.63 km) |
| Brest to Orsay | 306.09 mi (492.60 km) |
| Brest to Orthez | 382.83 mi (616.10 km) |
