| Thornton Heath to Illzach | 416.83 mi (670.83 km) |
| Thornton Heath to Ingre | 255.46 mi (411.13 km) |
| Thornton Heath to Irigny | 455.25 mi (732.65 km) |
| Thornton Heath to Isbergues | 123.75 mi (199.16 km) |
| Thornton Heath to Issoire | 432.74 mi (696.42 km) |
| Thornton Heath to Issoudun | 321.89 mi (518.04 km) |
| Thornton Heath to Issy-les-Moulineaux | 206.84 mi (332.88 km) |
| Thornton Heath to Istres | 594.23 mi (956.32 km) |
| Thornton Heath to Ivry-sur-Seine | 210.20 mi (338.28 km) |
| Thornton Heath to Jarville-la-Malgrange | 337.66 mi (543.41 km) |
| Thornton Heath to Jeumont | 198.88 mi (320.07 km) |
| Thornton Heath to Joigny | 283.34 mi (456.00 km) |
| Thornton Heath to Joinville-le-Pont | 211.70 mi (340.70 km) |
| Thornton Heath to Joue-les-Tours | 281.88 mi (453.65 km) |
| Thornton Heath to Jouy-le-Moutier | 190.43 mi (306.47 km) |
