| Viana do Castelo to Octeville | 647.79 mi (1,042.52 km) |
| Viana do Castelo to Oignies | 827.70 mi (1,332.06 km) |
| Viana do Castelo to Oissel | 712.69 mi (1,146.96 km) |
| Viana do Castelo to Olivet | 676.04 mi (1,087.98 km) |
| Viana do Castelo to Ollioules | 754.36 mi (1,214.03 km) |
| Viana do Castelo to Olonne-sur-Mer | 483.68 mi (778.41 km) |
| Viana do Castelo to Oloron-Sainte-Marie | 431.74 mi (694.82 km) |
| Viana do Castelo to Onet Village | 605.18 mi (973.95 km) |
| Viana do Castelo to Onnaing | 843.89 mi (1,358.12 km) |
| Viana do Castelo to Orange | 709.65 mi (1,142.07 km) |
| Viana do Castelo to Orchies | 836.13 mi (1,345.62 km) |
| Viana do Castelo to Orleans | 677.89 mi (1,090.96 km) |
| Viana do Castelo to Orly | 730.30 mi (1,175.31 km) |
| Viana do Castelo to Ormesson-sur-Marne | 737.32 mi (1,186.61 km) |
| Viana do Castelo to Orsay | 720.97 mi (1,160.29 km) |
