| Belfast to Ilawa | 1,029.64 mi (1,657.05 km) |
| Belfast to Imielin | 1,098.14 mi (1,767.29 km) |
| Belfast to Inowroclaw | 992.43 mi (1,597.16 km) |
| Belfast to Janow Lubelski | 1,209.03 mi (1,945.75 km) |
| Belfast to Jarocin | 979.98 mi (1,577.13 km) |
| Belfast to Jaroslaw | 1,239.79 mi (1,995.25 km) |
| Belfast to Jasien | 978.54 mi (1,574.82 km) |
| Belfast to Jaslo | 1,199.81 mi (1,930.91 km) |
| Belfast to Jastrzebie-Zdroj | 1,078.58 mi (1,735.80 km) |
| Belfast to Jawor | 951.47 mi (1,531.25 km) |
| Belfast to Jaworzno | 1,098.12 mi (1,767.26 km) |
| Belfast to Jedrzejow | 1,126.71 mi (1,813.27 km) |
| Belfast to Jelcz-Laskowice | 997.10 mi (1,604.68 km) |
| Belfast to Jelenia Gora | 937.05 mi (1,508.04 km) |
| Belfast to Jozefoslaw | 1,118.79 mi (1,800.52 km) |
