| Porthcawl to Joliet (Illinois) | 3,847.96 mi (6,192.69 km) |
| Porthcawl to Jonesboro (Arkansas) | 4,216.43 mi (6,785.69 km) |
| Porthcawl to Joplin (Missouri) | 4,305.42 mi (6,928.90 km) |
| Porthcawl to Joppatowne (Maryland) | 3,468.12 mi (5,581.40 km) |
| Porthcawl to Juana Díaz (Puerto Rico) | 4,085.95 mi (6,575.71 km) |
| Porthcawl to Junction City (Kansas) | 4,299.37 mi (6,919.17 km) |
| Porthcawl to Juneau (Alaska) | 4,347.34 mi (6,996.37 km) |
| Porthcawl to Jupiter (Florida) | 4,215.71 mi (6,784.53 km) |
| Porthcawl to Jupiter Farms (Florida) | 4,220.12 mi (6,791.63 km) |
| Porthcawl to Jurupa Valley (California) | 5,302.40 mi (8,533.40 km) |
| Porthcawl to Justice (Illinois) | 3,825.20 mi (6,156.07 km) |
| Porthcawl to Kahului (Hawaii) | 7,172.51 mi (11,543.05 km) |
| Porthcawl to Kailua (Hawaii) | 7,161.72 mi (11,525.68 km) |
| Porthcawl to Kalamazoo (Michigan) | 3,714.06 mi (5,977.20 km) |
| Porthcawl to Kalispell (Montana) | 4,427.43 mi (7,125.27 km) |
