| Portalegre to Idar-Oberstein | 1,017.55 mi (1,637.60 km) |
| Portalegre to Idstein | 1,072.89 mi (1,726.65 km) |
| Portalegre to Illertissen | 1,063.95 mi (1,712.27 km) |
| Portalegre to Illingen | 993.89 mi (1,599.51 km) |
| Portalegre to Ilmenau | 1,185.49 mi (1,907.86 km) |
| Portalegre to Ilsede | 1,226.31 mi (1,973.55 km) |
| Portalegre to Ilsenburg | 1,225.48 mi (1,972.23 km) |
| Portalegre to Ilsfeld | 1,060.93 mi (1,707.40 km) |
| Portalegre to Ilvesheim | 1,052.05 mi (1,693.11 km) |
| Portalegre to Immenstadt im Allgau | 1,048.59 mi (1,687.54 km) |
| Portalegre to Ingelheim | 1,054.76 mi (1,697.47 km) |
| Portalegre to Ingolstadt | 1,135.95 mi (1,828.14 km) |
| Portalegre to Iserlohn | 1,105.37 mi (1,778.92 km) |
| Portalegre to Isernhagen-Sud | 1,223.33 mi (1,968.76 km) |
| Portalegre to Ismaning | 1,129.22 mi (1,817.31 km) |
