| Houston to Mangualde | 4,800.39 mi (7,725.48 km) |
| Houston to Marco de Canavezes | 4,766.57 mi (7,671.06 km) |
| Houston to Marinha Grande | 4,765.16 mi (7,668.78 km) |
| Houston to Massama | 4,773.87 mi (7,682.80 km) |
| Houston to Matosinhos | 4,739.99 mi (7,628.27 km) |
| Houston to Mealhada | 4,772.56 mi (7,680.70 km) |
| Houston to Melgaco | 4,737.25 mi (7,623.87 km) |
| Houston to Melres | 4,757.47 mi (7,656.40 km) |
| Houston to Mira | 4,757.44 mi (7,656.37 km) |
| Houston to Miranda do Corvo | 4,785.60 mi (7,701.68 km) |
| Houston to Mirandela | 4,805.34 mi (7,733.44 km) |
| Houston to Mogadouro | 4,831.62 mi (7,775.74 km) |
| Houston to Moimenta da Beira | 4,797.74 mi (7,721.22 km) |
| Houston to Moita | 4,791.21 mi (7,710.70 km) |
| Houston to Moncao | 4,728.16 mi (7,609.23 km) |
