| Llantrisant to Imola | 854.31 mi (1,374.88 km) |
| Llantrisant to Impruneta | 868.42 mi (1,397.59 km) |
| Llantrisant to Induno Olona | 680.25 mi (1,094.76 km) |
| Llantrisant to Inverigo | 699.62 mi (1,125.93 km) |
| Llantrisant to Inveruno | 695.80 mi (1,119.79 km) |
| Llantrisant to Inzago | 718.36 mi (1,156.09 km) |
| Llantrisant to Iseo | 734.27 mi (1,181.69 km) |
| Llantrisant to Isernia | 1,077.51 mi (1,734.09 km) |
| Llantrisant to Isola Capo Rizzuto | 1,313.71 mi (2,114.21 km) |
| Llantrisant to Isola del Liri | 1,049.74 mi (1,689.40 km) |
| Llantrisant to Isola della Scala | 787.31 mi (1,267.06 km) |
| Llantrisant to Isola Vicentina | 788.88 mi (1,269.58 km) |
| Llantrisant to Ispica | 1,356.28 mi (2,182.72 km) |
| Llantrisant to Istrana | 812.25 mi (1,307.19 km) |
| Llantrisant to Itri | 1,068.28 mi (1,719.23 km) |
