| Portalegre to Isny im Allgau | 1,045.13 mi (1,681.97 km) |
| Portalegre to Isselburg | 1,090.96 mi (1,755.73 km) |
| Portalegre to Issum | 1,074.90 mi (1,729.89 km) |
| Portalegre to Itzehoe | 1,283.23 mi (2,065.16 km) |
| Portalegre to Jena | 1,219.02 mi (1,961.82 km) |
| Portalegre to Jever | 1,220.11 mi (1,963.58 km) |
| Portalegre to Jork | 1,269.18 mi (2,042.55 km) |
| Portalegre to Juchen | 1,055.60 mi (1,698.82 km) |
| Portalegre to Julich | 1,042.45 mi (1,677.66 km) |
| Portalegre to Juterbog | 1,313.16 mi (2,113.33 km) |
| Portalegre to Kaarst | 1,064.77 mi (1,713.59 km) |
| Portalegre to Kaiserslautern | 1,022.12 mi (1,644.94 km) |
| Portalegre to Kalkar | 1,081.12 mi (1,739.90 km) |
| Portalegre to Kall | 1,030.50 mi (1,658.43 km) |
| Portalegre to Kaltenkirchen | 1,292.01 mi (2,079.29 km) |
