| Sinaia to Mangualde | 1,702.88 mi (2,740.53 km) |
| Sinaia to Marco de Canavezes | 1,706.98 mi (2,747.13 km) |
| Sinaia to Marinha Grande | 1,782.95 mi (2,869.39 km) |
| Sinaia to Massama | 1,828.37 mi (2,942.48 km) |
| Sinaia to Matosinhos | 1,733.66 mi (2,790.06 km) |
| Sinaia to Mealhada | 1,742.17 mi (2,803.75 km) |
| Sinaia to Melgaco | 1,690.43 mi (2,720.48 km) |
| Sinaia to Melres | 1,722.03 mi (2,771.34 km) |
| Sinaia to Mira | 1,754.59 mi (2,823.74 km) |
| Sinaia to Miranda do Corvo | 1,744.14 mi (2,806.92 km) |
| Sinaia to Mirandela | 1,652.61 mi (2,659.63 km) |
| Sinaia to Mogadouro | 1,633.74 mi (2,629.25 km) |
| Sinaia to Moimenta da Beira | 1,686.06 mi (2,713.45 km) |
| Sinaia to Moita | 1,817.44 mi (2,924.89 km) |
| Sinaia to Moncao | 1,701.74 mi (2,738.69 km) |
