| Serpa to Octeville | 859.40 mi (1,383.08 km) |
| Serpa to Oignies | 1,009.69 mi (1,624.94 km) |
| Serpa to Oissel | 898.00 mi (1,445.20 km) |
| Serpa to Olivet | 835.78 mi (1,345.05 km) |
| Serpa to Ollioules | 790.68 mi (1,272.48 km) |
| Serpa to Olonne-sur-Mer | 663.76 mi (1,068.21 km) |
| Serpa to Oloron-Sainte-Marie | 515.62 mi (829.80 km) |
| Serpa to Onet Village | 690.42 mi (1,111.12 km) |
| Serpa to Onnaing | 1,020.78 mi (1,642.78 km) |
| Serpa to Orange | 774.10 mi (1,245.80 km) |
| Serpa to Orchies | 1,016.39 mi (1,635.72 km) |
| Serpa to Orleans | 838.11 mi (1,348.81 km) |
| Serpa to Orly | 897.64 mi (1,444.61 km) |
| Serpa to Ormesson-sur-Marne | 903.98 mi (1,454.82 km) |
| Serpa to Orsay | 889.46 mi (1,431.44 km) |
