| Merthyr Tudful to Ickenham | 126.23 mi (203.15 km) |
| Merthyr Tudful to Ifield | 143.12 mi (230.32 km) |
| Merthyr Tudful to Ilford | 149.03 mi (239.84 km) |
| Merthyr Tudful to Ilfracombe | 48.85 mi (78.61 km) |
| Merthyr Tudful to Ilkeston | 121.73 mi (195.91 km) |
| Merthyr Tudful to Ilkley | 164.15 mi (264.17 km) |
| Merthyr Tudful to Immingham | 184.98 mi (297.69 km) |
| Merthyr Tudful to Ince-in-Makerfield | 128.40 mi (206.63 km) |
| Merthyr Tudful to Inverness | 397.67 mi (639.99 km) |
| Merthyr Tudful to Inverurie | 384.65 mi (619.03 km) |
| Merthyr Tudful to Ipswich | 194.48 mi (312.98 km) |
| Merthyr Tudful to Irlam | 124.25 mi (199.96 km) |
| Merthyr Tudful to Irthlingborough | 124.15 mi (199.79 km) |
| Merthyr Tudful to Irvine | 272.97 mi (439.30 km) |
| Merthyr Tudful to Islington | 141.09 mi (227.06 km) |
