| Northolt to Imola | 746.48 mi (1,201.34 km) |
| Northolt to Impruneta | 765.14 mi (1,231.37 km) |
| Northolt to Induno Olona | 574.59 mi (924.71 km) |
| Northolt to Inverigo | 593.18 mi (954.62 km) |
| Northolt to Inveruno | 592.06 mi (952.82 km) |
| Northolt to Inzago | 612.06 mi (985.02 km) |
| Northolt to Iseo | 625.30 mi (1,006.33 km) |
| Northolt to Isernia | 973.08 mi (1,566.03 km) |
| Northolt to Isola Capo Rizzuto | 1,209.76 mi (1,946.92 km) |
| Northolt to Isola del Liri | 947.02 mi (1,524.08 km) |
| Northolt to Isola della Scala | 677.33 mi (1,090.06 km) |
| Northolt to Isola Vicentina | 675.94 mi (1,087.82 km) |
| Northolt to Ispica | 1,264.70 mi (2,035.33 km) |
| Northolt to Istrana | 697.48 mi (1,122.49 km) |
| Northolt to Itri | 967.11 mi (1,556.41 km) |
