| Letterkenny to Impruneta | 1,149.30 mi (1,849.61 km) |
| Letterkenny to Induno Olona | 958.70 mi (1,542.89 km) |
| Letterkenny to Inverigo | 977.21 mi (1,572.67 km) |
| Letterkenny to Inveruno | 976.21 mi (1,571.06 km) |
| Letterkenny to Inzago | 996.10 mi (1,603.08 km) |
| Letterkenny to Iseo | 1,008.82 mi (1,623.54 km) |
| Letterkenny to Isernia | 1,357.15 mi (2,184.12 km) |
| Letterkenny to Isola Capo Rizzuto | 1,593.81 mi (2,564.99 km) |
| Letterkenny to Isola del Liri | 1,331.18 mi (2,142.33 km) |
| Letterkenny to Isola della Scala | 1,060.42 mi (1,706.58 km) |
| Letterkenny to Isola Vicentina | 1,057.61 mi (1,702.06 km) |
| Letterkenny to Ispica | 1,646.56 mi (2,649.89 km) |
| Letterkenny to Istrana | 1,077.79 mi (1,734.53 km) |
| Letterkenny to Itri | 1,351.22 mi (2,174.58 km) |
| Letterkenny to Ittiri | 1,240.87 mi (1,996.99 km) |
