| Seraing to Marco de Canavezes | 920.73 mi (1,481.77 km) |
| Seraing to Marinha Grande | 1,023.40 mi (1,647.00 km) |
| Seraing to Massama | 1,089.01 mi (1,752.59 km) |
| Seraing to Matosinhos | 939.50 mi (1,511.98 km) |
| Seraing to Mealhada | 973.26 mi (1,566.31 km) |
| Seraing to Melgaco | 876.82 mi (1,411.11 km) |
| Seraing to Melres | 935.31 mi (1,505.24 km) |
| Seraing to Mira | 980.02 mi (1,577.19 km) |
| Seraing to Miranda do Corvo | 984.74 mi (1,584.79 km) |
| Seraing to Mirandela | 872.41 mi (1,404.01 km) |
| Seraing to Mogadouro | 865.43 mi (1,392.78 km) |
| Seraing to Moimenta da Beira | 913.66 mi (1,470.39 km) |
| Seraing to Moita | 1,085.67 mi (1,747.21 km) |
| Seraing to Moncao | 886.53 mi (1,426.73 km) |
| Seraing to Montalegre | 875.24 mi (1,408.56 km) |
