| Sileby to Mangualde | 894.38 mi (1,439.37 km) |
| Sileby to Marco de Canavezes | 863.25 mi (1,389.27 km) |
| Sileby to Marinha Grande | 970.39 mi (1,561.70 km) |
| Sileby to Massama | 1,041.17 mi (1,675.60 km) |
| Sileby to Matosinhos | 873.39 mi (1,405.59 km) |
| Sileby to Mealhada | 920.57 mi (1,481.52 km) |
| Sileby to Melgaco | 805.20 mi (1,295.85 km) |
| Sileby to Melres | 875.32 mi (1,408.70 km) |
| Sileby to Mira | 922.43 mi (1,484.50 km) |
| Sileby to Miranda do Corvo | 937.02 mi (1,507.98 km) |
| Sileby to Mirandela | 827.13 mi (1,331.14 km) |
| Sileby to Mogadouro | 830.01 mi (1,335.78 km) |
| Sileby to Moimenta da Beira | 867.33 mi (1,395.83 km) |
| Sileby to Moita | 1,043.04 mi (1,678.62 km) |
| Sileby to Moncao | 812.11 mi (1,306.96 km) |
