| Leighton Buzzard to Mangualde | 851.02 mi (1,369.59 km) |
| Leighton Buzzard to Marco de Canavezes | 821.50 mi (1,322.08 km) |
| Leighton Buzzard to Marinha Grande | 928.75 mi (1,494.68 km) |
| Leighton Buzzard to Massama | 999.21 mi (1,608.07 km) |
| Leighton Buzzard to Matosinhos | 832.99 mi (1,340.56 km) |
| Leighton Buzzard to Mealhada | 878.56 mi (1,413.90 km) |
| Leighton Buzzard to Melgaco | 765.06 mi (1,231.24 km) |
| Leighton Buzzard to Melres | 834.03 mi (1,342.24 km) |
| Leighton Buzzard to Mira | 881.12 mi (1,418.03 km) |
| Leighton Buzzard to Miranda do Corvo | 894.41 mi (1,439.42 km) |
| Leighton Buzzard to Mirandela | 783.38 mi (1,260.73 km) |
| Leighton Buzzard to Mogadouro | 784.97 mi (1,263.29 km) |
| Leighton Buzzard to Moimenta da Beira | 824.04 mi (1,326.16 km) |
| Leighton Buzzard to Moita | 1,000.37 mi (1,609.94 km) |
| Leighton Buzzard to Moncao | 772.45 mi (1,243.15 km) |
