| Rhondda to Ilawa | 969.67 mi (1,560.54 km) |
| Rhondda to Imielin | 988.12 mi (1,590.23 km) |
| Rhondda to Inowroclaw | 918.03 mi (1,477.42 km) |
| Rhondda to Janow Lubelski | 1,115.16 mi (1,794.68 km) |
| Rhondda to Jarocin | 891.18 mi (1,434.21 km) |
| Rhondda to Jaroslaw | 1,138.42 mi (1,832.11 km) |
| Rhondda to Jasien | 929.45 mi (1,495.80 km) |
| Rhondda to Jaslo | 1,091.85 mi (1,757.17 km) |
| Rhondda to Jastrzebie-Zdroj | 964.25 mi (1,551.81 km) |
| Rhondda to Jawor | 845.22 mi (1,360.26 km) |
| Rhondda to Jaworzno | 989.17 mi (1,591.92 km) |
| Rhondda to Jedrzejow | 1,026.21 mi (1,651.53 km) |
| Rhondda to Jelcz-Laskowice | 893.84 mi (1,438.50 km) |
| Rhondda to Jelenia Gora | 827.17 mi (1,331.21 km) |
| Rhondda to Jozefoslaw | 1,039.53 mi (1,672.95 km) |
