| Thornton Heath to Mexborough | 153.22 mi (246.59 km) |
| Thornton Heath to Mickleover | 120.40 mi (193.76 km) |
| Thornton Heath to Middlesbrough | 224.42 mi (361.16 km) |
| Thornton Heath to Middleton | 172.66 mi (277.86 km) |
| Thornton Heath to Middlewich | 158.28 mi (254.72 km) |
| Thornton Heath to Midsomer Norton | 102.73 mi (165.33 km) |
| Thornton Heath to Mildenhall | 70.37 mi (113.25 km) |
| Thornton Heath to Milford Haven | 213.02 mi (342.83 km) |
| Thornton Heath to Mill Hill | 16.06 mi (25.84 km) |
| Thornton Heath to Milngavie | 357.77 mi (575.77 km) |
| Thornton Heath to Milnrow | 174.36 mi (280.60 km) |
| Thornton Heath to Milton | 142.82 mi (229.84 km) |
| Thornton Heath to Milton Keynes | 52.26 mi (84.11 km) |
| Thornton Heath to Minehead | 145.99 mi (234.95 km) |
| Thornton Heath to Minster | 39.57 mi (63.68 km) |
