| Willebroek to Marco de Canavezes | 906.13 mi (1,458.27 km) |
| Willebroek to Marinha Grande | 1,010.49 mi (1,626.23 km) |
| Willebroek to Massama | 1,077.53 mi (1,734.11 km) |
| Willebroek to Matosinhos | 923.50 mi (1,486.23 km) |
| Willebroek to Mealhada | 960.01 mi (1,544.98 km) |
| Willebroek to Melgaco | 859.21 mi (1,382.77 km) |
| Willebroek to Melres | 920.39 mi (1,481.22 km) |
| Willebroek to Mira | 965.93 mi (1,554.51 km) |
| Willebroek to Miranda do Corvo | 972.50 mi (1,565.08 km) |
| Willebroek to Mirandela | 859.56 mi (1,383.33 km) |
| Willebroek to Mogadouro | 854.32 mi (1,374.90 km) |
| Willebroek to Moimenta da Beira | 901.03 mi (1,450.07 km) |
| Willebroek to Moita | 1,075.13 mi (1,730.25 km) |
| Willebroek to Moncao | 868.52 mi (1,397.74 km) |
| Willebroek to Montalegre | 859.74 mi (1,383.63 km) |
