| Northolt to Idar-Oberstein | 359.61 mi (578.74 km) |
| Northolt to Idstein | 387.53 mi (623.67 km) |
| Northolt to Illertissen | 518.52 mi (834.47 km) |
| Northolt to Illingen | 359.05 mi (577.83 km) |
| Northolt to Ilmenau | 492.78 mi (793.05 km) |
| Northolt to Ilsede | 452.19 mi (727.72 km) |
| Northolt to Ilsenburg | 473.32 mi (761.74 km) |
| Northolt to Ilsfeld | 457.85 mi (736.85 km) |
| Northolt to Ilvesheim | 417.71 mi (672.24 km) |
| Northolt to Immenstadt im Allgau | 547.66 mi (881.38 km) |
| Northolt to Ingelheim | 383.71 mi (617.53 km) |
| Northolt to Ingolstadt | 555.68 mi (894.28 km) |
| Northolt to Iserlohn | 345.95 mi (556.75 km) |
| Northolt to Isernhagen-Sud | 439.06 mi (706.59 km) |
| Northolt to Ismaning | 582.23 mi (937.00 km) |
