| Saint-Sebastien-sur-Loire to Marco de Canavezes | 530.39 mi (853.58 km) |
| Saint-Sebastien-sur-Loire to Marinha Grande | 635.26 mi (1,022.35 km) |
| Saint-Sebastien-sur-Loire to Massama | 703.02 mi (1,131.40 km) |
| Saint-Sebastien-sur-Loire to Matosinhos | 547.65 mi (881.35 km) |
| Saint-Sebastien-sur-Loire to Mealhada | 584.68 mi (940.94 km) |
| Saint-Sebastien-sur-Loire to Melgaco | 483.67 mi (778.39 km) |
| Saint-Sebastien-sur-Loire to Melres | 544.59 mi (876.43 km) |
| Saint-Sebastien-sur-Loire to Mira | 590.28 mi (949.97 km) |
| Saint-Sebastien-sur-Loire to Miranda do Corvo | 597.68 mi (961.87 km) |
| Saint-Sebastien-sur-Loire to Mirandela | 484.60 mi (779.88 km) |
| Saint-Sebastien-sur-Loire to Mogadouro | 480.72 mi (773.64 km) |
| Saint-Sebastien-sur-Loire to Moimenta da Beira | 526.12 mi (846.70 km) |
| Saint-Sebastien-sur-Loire to Moita | 701.33 mi (1,128.68 km) |
| Saint-Sebastien-sur-Loire to Moncao | 493.14 mi (793.64 km) |
| Saint-Sebastien-sur-Loire to Montalegre | 483.89 mi (778.75 km) |
