| Opava to Montemor-o-Novo | 1,497.34 mi (2,409.74 km) |
| Opava to Montemor-o-Velho | 1,452.05 mi (2,336.85 km) |
| Opava to Montijo | 1,524.26 mi (2,453.06 km) |
| Opava to Mortagua | 1,422.03 mi (2,288.54 km) |
| Opava to Moura | 1,489.08 mi (2,396.44 km) |
| Opava to Murtosa | 1,426.93 mi (2,296.42 km) |
| Opava to Nazare | 1,491.86 mi (2,400.92 km) |
| Opava to Nelas | 1,402.38 mi (2,256.91 km) |
| Opava to Obidos | 1,505.93 mi (2,423.56 km) |
| Opava to Odemira | 1,562.61 mi (2,514.77 km) |
| Opava to Odivelas | 1,531.27 mi (2,464.33 km) |
| Opava to Oeiras | 1,541.66 mi (2,481.06 km) |
| Opava to Olhao | 1,556.38 mi (2,504.76 km) |
| Opava to Oliveira de Azemeis | 1,415.91 mi (2,278.68 km) |
| Opava to Oliveira de Frades | 1,408.41 mi (2,266.62 km) |
