| Llantrisant to Merrick (New York) | 3,311.13 mi (5,328.74 km) |
| Llantrisant to Merrifield (Virginia) | 3,540.70 mi (5,698.20 km) |
| Llantrisant to Merrillville (Indiana) | 3,828.20 mi (6,160.89 km) |
| Llantrisant to Merritt Island (Florida) | 4,182.88 mi (6,731.70 km) |
| Llantrisant to Mesa (Arizona) | 5,145.63 mi (8,281.10 km) |
| Llantrisant to Mesquite (Nevada) | 5,042.82 mi (8,115.63 km) |
| Llantrisant to Mesquite (Texas) | 4,613.31 mi (7,424.41 km) |
| Llantrisant to Metairie (Louisiana) | 4,495.76 mi (7,235.22 km) |
| Llantrisant to Methuen Town (Massachusetts) | 3,127.18 mi (5,032.71 km) |
| Llantrisant to Metuchen (New Jersey) | 3,349.19 mi (5,389.99 km) |
| Llantrisant to Mexico (Missouri) | 4,112.71 mi (6,618.77 km) |
| Llantrisant to Miami (Florida) | 4,289.64 mi (6,903.52 km) |
| Llantrisant to Miami (Oklahoma) | 4,339.29 mi (6,983.41 km) |
| Llantrisant to Miami Beach (Florida) | 4,284.97 mi (6,896.00 km) |
| Llantrisant to Miami Gardens (Florida) | 4,283.02 mi (6,892.85 km) |
