| Swansea to Mexborough | 4,092.85 mi (6,586.80 km) |
| Swansea to Mickleover | 4,099.92 mi (6,598.18 km) |
| Swansea to Middlesbrough | 4,064.05 mi (6,540.45 km) |
| Swansea to Middleton | 4,057.40 mi (6,529.75 km) |
| Swansea to Middlewich | 4,057.91 mi (6,530.58 km) |
| Swansea to Midsomer Norton | 4,110.94 mi (6,615.91 km) |
| Swansea to Mildenhall | 4,194.49 mi (6,750.37 km) |
| Swansea to Milford Haven | 3,998.23 mi (6,434.53 km) |
| Swansea to Mill Hill | 4,188.40 mi (6,740.58 km) |
| Swansea to Milngavie | 3,915.99 mi (6,302.17 km) |
| Swansea to Milnrow | 4,058.70 mi (6,531.85 km) |
| Swansea to Milton | 4,073.31 mi (6,555.36 km) |
| Swansea to Milton Keynes | 4,155.37 mi (6,687.42 km) |
| Swansea to Minehead | 4,074.25 mi (6,556.87 km) |
| Swansea to Minster | 4,234.50 mi (6,814.77 km) |
