| Portsmouth to Imola | 743.14 mi (1,195.96 km) |
| Portsmouth to Impruneta | 757.90 mi (1,219.72 km) |
| Portsmouth to Induno Olona | 569.23 mi (916.09 km) |
| Portsmouth to Inverigo | 588.52 mi (947.14 km) |
| Portsmouth to Inveruno | 585.06 mi (941.57 km) |
| Portsmouth to Inzago | 607.29 mi (977.34 km) |
| Portsmouth to Iseo | 622.96 mi (1,002.56 km) |
| Portsmouth to Isernia | 966.89 mi (1,556.07 km) |
| Portsmouth to Isola Capo Rizzuto | 1,203.26 mi (1,936.46 km) |
| Portsmouth to Isola del Liri | 939.43 mi (1,511.87 km) |
| Portsmouth to Isola della Scala | 675.97 mi (1,087.86 km) |
| Portsmouth to Isola Vicentina | 677.51 mi (1,090.34 km) |
| Portsmouth to Ispica | 1,249.19 mi (2,010.38 km) |
| Portsmouth to Istrana | 700.98 mi (1,128.12 km) |
| Portsmouth to Itri | 958.30 mi (1,542.24 km) |
