| Holyhead to Ifield | 240.56 mi (387.14 km) |
| Holyhead to Ilford | 232.65 mi (374.41 km) |
| Holyhead to Ilfracombe | 146.78 mi (236.21 km) |
| Holyhead to Ilkeston | 139.72 mi (224.86 km) |
| Holyhead to Ilkley | 122.81 mi (197.64 km) |
| Holyhead to Immingham | 182.79 mi (294.17 km) |
| Holyhead to Ince-in-Makerfield | 85.25 mi (137.20 km) |
| Holyhead to Inverness | 288.48 mi (464.26 km) |
| Holyhead to Inverurie | 288.29 mi (463.96 km) |
| Holyhead to Ipswich | 257.28 mi (414.05 km) |
| Holyhead to Irlam | 91.61 mi (147.43 km) |
| Holyhead to Irthlingborough | 181.07 mi (291.40 km) |
| Holyhead to Irvine | 159.69 mi (256.99 km) |
| Holyhead to Islington | 226.44 mi (364.41 km) |
| Holyhead to Iver | 213.24 mi (343.18 km) |
