| Watford to Montijo | 930.24 mi (1,497.08 km) |
| Watford to Montilla | 993.91 mi (1,599.54 km) |
| Watford to Montmelo | 708.95 mi (1,140.94 km) |
| Watford to Montornes del Valles | 709.79 mi (1,142.30 km) |
| Watford to Montoro | 961.98 mi (1,548.16 km) |
| Watford to Monzon | 673.88 mi (1,084.50 km) |
| Watford to Mora | 842.83 mi (1,356.41 km) |
| Watford to Moralzarzal | 777.43 mi (1,251.16 km) |
| Watford to Moron de la Frontera | 1,034.05 mi (1,664.14 km) |
| Watford to Mostoles | 799.56 mi (1,286.77 km) |
| Watford to Motril | 1,041.12 mi (1,675.53 km) |
| Watford to Muchamiel | 914.90 mi (1,472.38 km) |
| Watford to Mula | 942.07 mi (1,516.12 km) |
| Watford to Munguia | 584.71 mi (941.00 km) |
| Watford to Murcia | 945.10 mi (1,521.00 km) |
