| Upminster to Masanasa | 839.89 mi (1,351.67 km) |
| Upminster to Masquefa | 698.45 mi (1,124.04 km) |
| Upminster to Matadepera | 692.70 mi (1,114.80 km) |
| Upminster to Mazarron | 967.37 mi (1,556.84 km) |
| Upminster to Meco | 779.01 mi (1,253.70 km) |
| Upminster to Medina del Campo | 749.64 mi (1,206.44 km) |
| Upminster to Medina Sidonia | 1,085.69 mi (1,747.26 km) |
| Upminster to Mejorada del Campo | 790.28 mi (1,271.84 km) |
| Upminster to Meliana | 831.59 mi (1,338.31 km) |
| Upminster to Mengibar | 959.31 mi (1,543.86 km) |
| Upminster to Merida | 930.34 mi (1,497.24 km) |
| Upminster to Miajadas | 909.54 mi (1,463.76 km) |
| Upminster to Mieres | 638.79 mi (1,028.03 km) |
| Upminster to Miguelturra | 893.10 mi (1,437.31 km) |
| Upminster to Mijas | 1,060.79 mi (1,707.18 km) |
