| Seclin to Marco de Canavezes | 839.53 mi (1,351.10 km) |
| Seclin to Marinha Grande | 944.34 mi (1,519.77 km) |
| Seclin to Massama | 1,011.80 mi (1,628.33 km) |
| Seclin to Matosinhos | 856.51 mi (1,378.42 km) |
| Seclin to Mealhada | 893.78 mi (1,438.40 km) |
| Seclin to Melgaco | 791.87 mi (1,274.39 km) |
| Seclin to Melres | 853.69 mi (1,373.88 km) |
| Seclin to Mira | 899.44 mi (1,447.50 km) |
| Seclin to Miranda do Corvo | 906.59 mi (1,459.01 km) |
| Seclin to Mirandela | 793.55 mi (1,277.09 km) |
| Seclin to Mogadouro | 788.92 mi (1,269.65 km) |
| Seclin to Moimenta da Beira | 835.05 mi (1,343.89 km) |
| Seclin to Moita | 1,009.72 mi (1,624.99 km) |
| Seclin to Moncao | 801.08 mi (1,289.21 km) |
| Seclin to Montalegre | 792.93 mi (1,276.11 km) |
