| Ardea to Octeville | 878.81 mi (1,414.31 km) |
| Ardea to Oignies | 762.98 mi (1,227.91 km) |
| Ardea to Oissel | 768.52 mi (1,236.81 km) |
| Ardea to Olivet | 676.76 mi (1,089.15 km) |
| Ardea to Ollioules | 357.82 mi (575.86 km) |
| Ardea to Olonne-sur-Mer | 786.46 mi (1,265.68 km) |
| Ardea to Oloron-Sainte-Marie | 679.28 mi (1,093.20 km) |
| Ardea to Onet Village | 537.40 mi (864.86 km) |
| Ardea to Onnaing | 741.71 mi (1,193.67 km) |
| Ardea to Orange | 428.66 mi (689.86 km) |
| Ardea to Orchies | 756.20 mi (1,216.98 km) |
| Ardea to Orleans | 678.01 mi (1,091.15 km) |
| Ardea to Orly | 696.86 mi (1,121.48 km) |
| Ardea to Ormesson-sur-Marne | 693.81 mi (1,116.58 km) |
| Ardea to Orsay | 701.88 mi (1,129.57 km) |
