| Sintra to Mangualde | 151.77 mi (244.25 km) |
| Sintra to Marco de Canavezes | 177.28 mi (285.31 km) |
| Sintra to Marinha Grande | 70.06 mi (112.74 km) |
| Sintra to Massama | 6.78 mi (10.91 km) |
| Sintra to Matosinhos | 168.70 mi (271.50 km) |
| Sintra to Mealhada | 120.31 mi (193.62 km) |
| Sintra to Melgaco | 236.67 mi (380.89 km) |
| Sintra to Melres | 165.18 mi (265.84 km) |
| Sintra to Mira | 118.16 mi (190.17 km) |
| Sintra to Miranda do Corvo | 106.05 mi (170.66 km) |
| Sintra to Mirandela | 219.13 mi (352.66 km) |
| Sintra to Mogadouro | 224.95 mi (362.02 km) |
| Sintra to Moimenta da Beira | 177.61 mi (285.84 km) |
| Sintra to Moita | 24.14 mi (38.85 km) |
| Sintra to Moncao | 231.20 mi (372.08 km) |
