| Portalegre to Octeville | 766.56 mi (1,233.66 km) |
| Portalegre to Oignies | 921.84 mi (1,483.56 km) |
| Portalegre to Oissel | 809.15 mi (1,302.20 km) |
| Portalegre to Olivet | 751.29 mi (1,209.08 km) |
| Portalegre to Ollioules | 737.09 mi (1,186.23 km) |
| Portalegre to Olonne-sur-Mer | 574.39 mi (924.39 km) |
| Portalegre to Oloron-Sainte-Marie | 443.48 mi (713.72 km) |
| Portalegre to Onet Village | 621.54 mi (1,000.27 km) |
| Portalegre to Onnaing | 933.90 mi (1,502.97 km) |
| Portalegre to Orange | 712.04 mi (1,145.92 km) |
| Portalegre to Orchies | 928.87 mi (1,494.88 km) |
| Portalegre to Orleans | 753.54 mi (1,212.71 km) |
| Portalegre to Orly | 812.04 mi (1,306.85 km) |
| Portalegre to Ormesson-sur-Marne | 818.54 mi (1,317.31 km) |
| Portalegre to Orsay | 803.59 mi (1,293.25 km) |
