| Porto to Octeville | 675.12 mi (1,086.51 km) |
| Porto to Oignies | 850.28 mi (1,368.40 km) |
| Porto to Oissel | 735.42 mi (1,183.54 km) |
| Porto to Olivet | 694.00 mi (1,116.88 km) |
| Porto to Ollioules | 752.65 mi (1,211.27 km) |
| Porto to Olonne-sur-Mer | 503.94 mi (811.01 km) |
| Porto to Oloron-Sainte-Marie | 433.54 mi (697.72 km) |
| Porto to Onet Village | 609.82 mi (981.41 km) |
| Porto to Onnaing | 865.63 mi (1,393.10 km) |
| Porto to Orange | 711.93 mi (1,145.74 km) |
| Porto to Orchies | 858.43 mi (1,381.51 km) |
| Porto to Orleans | 695.95 mi (1,120.02 km) |
| Porto to Orly | 749.90 mi (1,206.85 km) |
| Porto to Ormesson-sur-Marne | 756.84 mi (1,218.02 km) |
| Porto to Orsay | 740.73 mi (1,192.09 km) |
