| Penarth to Ickenham | 117.40 mi (188.94 km) |
| Penarth to Ifield | 129.78 mi (208.87 km) |
| Penarth to Ilford | 140.32 mi (225.83 km) |
| Penarth to Ilfracombe | 43.80 mi (70.48 km) |
| Penarth to Ilkeston | 132.46 mi (213.17 km) |
| Penarth to Ilkley | 181.39 mi (291.92 km) |
| Penarth to Immingham | 195.33 mi (314.35 km) |
| Penarth to Ince-in-Makerfield | 147.77 mi (237.81 km) |
| Penarth to Inverness | 419.99 mi (675.91 km) |
| Penarth to Inverurie | 405.44 mi (652.49 km) |
| Penarth to Ipswich | 190.06 mi (305.87 km) |
| Penarth to Irlam | 142.74 mi (229.72 km) |
| Penarth to Irthlingborough | 125.30 mi (201.65 km) |
| Penarth to Irvine | 295.90 mi (476.20 km) |
| Penarth to Islington | 132.19 mi (212.74 km) |
