| Sleaford to Mangualde | 922.87 mi (1,485.21 km) |
| Sleaford to Marco de Canavezes | 892.42 mi (1,436.21 km) |
| Sleaford to Marinha Grande | 999.63 mi (1,608.75 km) |
| Sleaford to Massama | 1,070.29 mi (1,722.47 km) |
| Sleaford to Matosinhos | 903.09 mi (1,453.38 km) |
| Sleaford to Mealhada | 949.64 mi (1,528.31 km) |
| Sleaford to Melgaco | 834.97 mi (1,343.75 km) |
| Sleaford to Melres | 904.67 mi (1,455.93 km) |
| Sleaford to Mira | 951.79 mi (1,531.75 km) |
| Sleaford to Miranda do Corvo | 965.84 mi (1,554.38 km) |
| Sleaford to Mirandela | 855.42 mi (1,376.66 km) |
| Sleaford to Mogadouro | 857.68 mi (1,380.30 km) |
| Sleaford to Moimenta da Beira | 895.84 mi (1,441.71 km) |
| Sleaford to Moita | 1,071.86 mi (1,725.00 km) |
| Sleaford to Moncao | 842.06 mi (1,355.16 km) |
