| Glastonbury to Mangualde | 767.46 mi (1,235.11 km) |
| Glastonbury to Marco de Canavezes | 735.52 mi (1,183.70 km) |
| Glastonbury to Marinha Grande | 842.53 mi (1,355.92 km) |
| Glastonbury to Massama | 913.40 mi (1,469.98 km) |
| Glastonbury to Matosinhos | 745.12 mi (1,199.15 km) |
| Glastonbury to Mealhada | 792.91 mi (1,276.07 km) |
| Glastonbury to Melgaco | 676.88 mi (1,089.34 km) |
| Glastonbury to Melres | 747.38 mi (1,202.79 km) |
| Glastonbury to Mira | 794.45 mi (1,278.54 km) |
| Glastonbury to Miranda do Corvo | 809.63 mi (1,302.97 km) |
| Glastonbury to Mirandela | 700.54 mi (1,127.41 km) |
| Glastonbury to Mogadouro | 704.35 mi (1,133.54 km) |
| Glastonbury to Moimenta da Beira | 740.39 mi (1,191.55 km) |
| Glastonbury to Moita | 915.61 mi (1,473.54 km) |
| Glastonbury to Moncao | 683.63 mi (1,100.20 km) |
