| Silea to Marco de Canavezes | 1,068.23 mi (1,719.15 km) |
| Silea to Marinha Grande | 1,148.33 mi (1,848.06 km) |
| Silea to Massama | 1,197.66 mi (1,927.44 km) |
| Silea to Matosinhos | 1,094.45 mi (1,761.35 km) |
| Silea to Mealhada | 1,105.73 mi (1,779.50 km) |
| Silea to Melgaco | 1,049.59 mi (1,689.15 km) |
| Silea to Melres | 1,083.39 mi (1,743.54 km) |
| Silea to Mira | 1,117.62 mi (1,798.63 km) |
| Silea to Miranda do Corvo | 1,108.97 mi (1,784.72 km) |
| Silea to Mirandela | 1,013.84 mi (1,631.62 km) |
| Silea to Mogadouro | 995.91 mi (1,602.76 km) |
| Silea to Moimenta da Beira | 1,048.48 mi (1,687.37 km) |
| Silea to Moita | 1,187.89 mi (1,911.73 km) |
| Silea to Moncao | 1,060.88 mi (1,707.33 km) |
| Silea to Montalegre | 1,034.10 mi (1,664.22 km) |
