| Thornton Heath to Imola | 731.40 mi (1,177.08 km) |
| Thornton Heath to Impruneta | 750.01 mi (1,207.02 km) |
| Thornton Heath to Induno Olona | 559.46 mi (900.37 km) |
| Thornton Heath to Inverigo | 578.06 mi (930.30 km) |
| Thornton Heath to Inveruno | 576.92 mi (928.47 km) |
| Thornton Heath to Inzago | 596.95 mi (960.70 km) |
| Thornton Heath to Iseo | 610.24 mi (982.08 km) |
| Thornton Heath to Isernia | 957.97 mi (1,541.70 km) |
| Thornton Heath to Isola Capo Rizzuto | 1,194.64 mi (1,922.59 km) |
| Thornton Heath to Isola del Liri | 931.89 mi (1,499.73 km) |
| Thornton Heath to Isola della Scala | 662.30 mi (1,065.87 km) |
| Thornton Heath to Isola Vicentina | 661.01 mi (1,063.80 km) |
| Thornton Heath to Ispica | 1,249.65 mi (2,011.11 km) |
| Thornton Heath to Istrana | 682.65 mi (1,098.62 km) |
| Thornton Heath to Itri | 951.97 mi (1,532.05 km) |
