| Rhondda to Isny im Allgau | 658.90 mi (1,060.39 km) |
| Rhondda to Isselburg | 422.98 mi (680.72 km) |
| Rhondda to Issum | 422.28 mi (679.59 km) |
| Rhondda to Itzehoe | 562.80 mi (905.73 km) |
| Rhondda to Jena | 649.15 mi (1,044.71 km) |
| Rhondda to Jever | 493.32 mi (793.93 km) |
| Rhondda to Jork | 564.89 mi (909.10 km) |
| Rhondda to Juchen | 429.11 mi (690.58 km) |
| Rhondda to Julich | 424.98 mi (683.95 km) |
| Rhondda to Juterbog | 703.49 mi (1,132.16 km) |
| Rhondda to Kaarst | 432.92 mi (696.71 km) |
| Rhondda to Kaiserslautern | 513.11 mi (825.77 km) |
| Rhondda to Kalkar | 415.79 mi (669.16 km) |
| Rhondda to Kall | 438.49 mi (705.67 km) |
| Rhondda to Kaltenkirchen | 579.49 mi (932.59 km) |
