| Challans to Oignies | 334.64 mi (538.55 km) |
| Challans to Oissel | 220.19 mi (354.37 km) |
| Challans to Olivet | 190.30 mi (306.25 km) |
| Challans to Ollioules | 455.83 mi (733.59 km) |
| Challans to Olonne-sur-Mer | 22.03 mi (35.46 km) |
| Challans to Oloron-Sainte-Marie | 259.88 mi (418.24 km) |
| Challans to Onet Village | 275.80 mi (443.85 km) |
| Challans to Onnaing | 349.72 mi (562.82 km) |
| Challans to Orange | 373.90 mi (601.74 km) |
| Challans to Orchies | 342.60 mi (551.36 km) |
| Challans to Orleans | 191.60 mi (308.35 km) |
| Challans to Orly | 237.60 mi (382.38 km) |
| Challans to Ormesson-sur-Marne | 244.76 mi (393.90 km) |
| Challans to Orsay | 228.00 mi (366.93 km) |
| Challans to Orthez | 238.24 mi (383.40 km) |
