| Monthey to Mangualde | 833.09 mi (1,340.73 km) |
| Monthey to Marco de Canavezes | 829.58 mi (1,335.09 km) |
| Monthey to Marinha Grande | 917.31 mi (1,476.27 km) |
| Monthey to Massama | 972.40 mi (1,564.93 km) |
| Monthey to Matosinhos | 854.42 mi (1,375.06 km) |
| Monthey to Mealhada | 871.79 mi (1,403.01 km) |
| Monthey to Melgaco | 804.63 mi (1,294.93 km) |
| Monthey to Melres | 844.88 mi (1,359.70 km) |
| Monthey to Mira | 882.50 mi (1,420.24 km) |
| Monthey to Miranda do Corvo | 877.42 mi (1,412.07 km) |
| Monthey to Mirandela | 775.64 mi (1,248.27 km) |
| Monthey to Mogadouro | 760.20 mi (1,223.42 km) |
| Monthey to Moimenta da Beira | 812.76 mi (1,308.01 km) |
| Monthey to Moita | 964.49 mi (1,552.19 km) |
| Monthey to Moncao | 815.78 mi (1,312.86 km) |
