| Houston to Imola | 5,563.14 mi (8,953.00 km) |
| Houston to Impruneta | 5,568.67 mi (8,961.90 km) |
| Houston to Induno Olona | 5,389.24 mi (8,673.15 km) |
| Houston to Inverigo | 5,409.24 mi (8,705.32 km) |
| Houston to Inveruno | 5,401.70 mi (8,693.19 km) |
| Houston to Inzago | 5,427.40 mi (8,734.55 km) |
| Houston to Iseo | 5,446.45 mi (8,765.22 km) |
| Houston to Isernia | 5,774.76 mi (9,293.58 km) |
| Houston to Isola Capo Rizzuto | 6,003.50 mi (9,661.69 km) |
| Houston to Isola del Liri | 5,743.37 mi (9,243.06 km) |
| Houston to Isola della Scala | 5,500.05 mi (8,851.47 km) |
| Houston to Isola Vicentina | 5,504.61 mi (8,858.82 km) |
| Houston to Ispica | 5,994.87 mi (9,647.81 km) |
| Houston to Istrana | 5,529.19 mi (8,898.38 km) |
| Houston to Itri | 5,757.08 mi (9,265.12 km) |
