| Butler to Mangualde | 3,661.31 mi (5,892.31 km) |
| Butler to Marco de Canavezes | 3,625.81 mi (5,835.18 km) |
| Butler to Marinha Grande | 3,631.16 mi (5,843.79 km) |
| Butler to Massama | 3,644.89 mi (5,865.88 km) |
| Butler to Matosinhos | 3,599.89 mi (5,793.46 km) |
| Butler to Mealhada | 3,635.26 mi (5,850.38 km) |
| Butler to Melgaco | 3,593.35 mi (5,782.93 km) |
| Butler to Melres | 3,617.44 mi (5,821.71 km) |
| Butler to Mira | 3,620.31 mi (5,826.33 km) |
| Butler to Miranda do Corvo | 3,649.28 mi (5,872.95 km) |
| Butler to Mirandela | 3,662.39 mi (5,894.04 km) |
| Butler to Mogadouro | 3,688.66 mi (5,936.32 km) |
| Butler to Moimenta da Beira | 3,657.08 mi (5,885.50 km) |
| Butler to Moita | 3,662.25 mi (5,893.82 km) |
| Butler to Moncao | 3,584.62 mi (5,768.89 km) |
