| Sintra to Merrick (New York) | 3,333.84 mi (5,365.30 km) |
| Sintra to Merrifield (Virginia) | 3,561.05 mi (5,730.96 km) |
| Sintra to Merrillville (Indiana) | 3,973.97 mi (6,395.49 km) |
| Sintra to Merritt Island (Florida) | 4,065.74 mi (6,543.17 km) |
| Sintra to Mesa (Arizona) | 5,396.97 mi (8,685.58 km) |
| Sintra to Mesquite (Nevada) | 5,354.28 mi (8,616.88 km) |
| Sintra to Mesquite (Texas) | 4,713.30 mi (7,585.33 km) |
| Sintra to Metairie (Louisiana) | 4,496.79 mi (7,236.89 km) |
| Sintra to Methuen Town (Massachusetts) | 3,172.53 mi (5,105.69 km) |
| Sintra to Metuchen (New Jersey) | 3,376.30 mi (5,433.63 km) |
| Sintra to Mexico (Missouri) | 4,260.04 mi (6,855.87 km) |
| Sintra to Miami (Florida) | 4,131.47 mi (6,648.96 km) |
| Sintra to Miami (Oklahoma) | 4,479.76 mi (7,209.47 km) |
| Sintra to Miami Beach (Florida) | 4,126.54 mi (6,641.02 km) |
| Sintra to Miami Gardens (Florida) | 4,127.43 mi (6,642.46 km) |
