| Ilhavo to Octeville | 710.80 mi (1,143.92 km) |
| Ilhavo to Oignies | 882.98 mi (1,421.02 km) |
| Ilhavo to Oissel | 768.31 mi (1,236.48 km) |
| Ilhavo to Olivet | 723.73 mi (1,164.74 km) |
| Ilhavo to Ollioules | 766.01 mi (1,232.77 km) |
| Ilhavo to Olonne-sur-Mer | 535.60 mi (861.96 km) |
| Ilhavo to Oloron-Sainte-Marie | 451.36 mi (726.40 km) |
| Ilhavo to Onet Village | 629.29 mi (1,012.74 km) |
| Ilhavo to Onnaing | 897.77 mi (1,444.82 km) |
| Ilhavo to Orange | 729.04 mi (1,173.28 km) |
| Ilhavo to Orchies | 890.95 mi (1,433.84 km) |
| Ilhavo to Orleans | 725.75 mi (1,167.98 km) |
| Ilhavo to Orly | 780.71 mi (1,256.43 km) |
| Ilhavo to Ormesson-sur-Marne | 787.58 mi (1,267.48 km) |
| Ilhavo to Orsay | 771.65 mi (1,241.85 km) |
