| Huntsville to Mangualde | 4,187.20 mi (6,738.64 km) |
| Huntsville to Marco de Canavezes | 4,153.41 mi (6,684.26 km) |
| Huntsville to Marinha Grande | 4,152.10 mi (6,682.16 km) |
| Huntsville to Massama | 4,161.18 mi (6,696.78 km) |
| Huntsville to Matosinhos | 4,126.81 mi (6,641.45 km) |
| Huntsville to Mealhada | 4,159.39 mi (6,693.89 km) |
| Huntsville to Melgaco | 4,124.26 mi (6,637.35 km) |
| Huntsville to Melres | 4,144.29 mi (6,669.59 km) |
| Huntsville to Mira | 4,144.27 mi (6,669.56 km) |
| Huntsville to Miranda do Corvo | 4,172.45 mi (6,714.91 km) |
| Huntsville to Mirandela | 4,192.27 mi (6,746.80 km) |
| Huntsville to Mogadouro | 4,218.55 mi (6,789.09 km) |
| Huntsville to Moimenta da Beira | 4,184.57 mi (6,734.42 km) |
| Huntsville to Moita | 4,178.53 mi (6,724.70 km) |
| Huntsville to Moncao | 4,115.13 mi (6,622.67 km) |
