| Mettlach to Marco de Canavezes | 915.12 mi (1,472.74 km) |
| Mettlach to Marinha Grande | 1,014.45 mi (1,632.59 km) |
| Mettlach to Massama | 1,077.48 mi (1,734.04 km) |
| Mettlach to Matosinhos | 935.90 mi (1,506.19 km) |
| Mettlach to Mealhada | 965.18 mi (1,553.31 km) |
| Mettlach to Melgaco | 876.23 mi (1,410.15 km) |
| Mettlach to Melres | 930.08 mi (1,496.82 km) |
| Mettlach to Mira | 973.19 mi (1,566.19 km) |
| Mettlach to Miranda do Corvo | 975.04 mi (1,569.17 km) |
| Mettlach to Mirandela | 864.52 mi (1,391.32 km) |
| Mettlach to Mogadouro | 854.94 mi (1,375.90 km) |
| Mettlach to Moimenta da Beira | 905.07 mi (1,456.57 km) |
| Mettlach to Moita | 1,072.73 mi (1,726.40 km) |
| Mettlach to Moncao | 886.49 mi (1,426.67 km) |
| Mettlach to Montalegre | 871.38 mi (1,402.35 km) |
