| Sintra to Melzo | 1,065.30 mi (1,714.43 km) |
| Sintra to Mendicino | 1,368.87 mi (2,202.99 km) |
| Sintra to Menfi | 1,213.63 mi (1,953.14 km) |
| Sintra to Mentana | 1,177.13 mi (1,894.40 km) |
| Sintra to Merano | 1,171.16 mi (1,884.81 km) |
| Sintra to Merate | 1,070.65 mi (1,723.05 km) |
| Sintra to Mercato San Severino | 1,285.59 mi (2,068.96 km) |
| Sintra to Mercogliano | 1,284.08 mi (2,066.53 km) |
| Sintra to Mesagne | 1,445.09 mi (2,325.65 km) |
| Sintra to Messina | 1,345.24 mi (2,164.96 km) |
| Sintra to Mestre | 1,195.73 mi (1,924.35 km) |
| Sintra to Mestrino | 1,172.96 mi (1,887.70 km) |
| Sintra to Milan | 1,054.18 mi (1,696.53 km) |
| Sintra to Milazzo | 1,327.99 mi (2,137.20 km) |
| Sintra to Minerbio | 1,144.68 mi (1,842.18 km) |
