| Horndean to Octeville | 93.38 mi (150.28 km) |
| Horndean to Oignies | 177.29 mi (285.32 km) |
| Horndean to Oissel | 142.61 mi (229.52 km) |
| Horndean to Olivet | 247.69 mi (398.62 km) |
| Horndean to Ollioules | 625.80 mi (1,007.12 km) |
| Horndean to Olonne-sur-Mer | 304.52 mi (490.07 km) |
| Horndean to Oloron-Sainte-Marie | 533.67 mi (858.86 km) |
| Horndean to Onet Village | 482.15 mi (775.95 km) |
| Horndean to Onnaing | 204.48 mi (329.08 km) |
| Horndean to Orange | 540.45 mi (869.78 km) |
| Horndean to Orchies | 188.02 mi (302.59 km) |
| Horndean to Orleans | 245.60 mi (395.25 km) |
| Horndean to Orly | 212.77 mi (342.42 km) |
| Horndean to Ormesson-sur-Marne | 215.38 mi (346.62 km) |
| Horndean to Orsay | 208.73 mi (335.92 km) |
