| Brent to Ickenham | 4,471.45 mi (7,196.11 km) |
| Brent to Ifield | 4,490.66 mi (7,227.01 km) |
| Brent to Ilford | 4,493.28 mi (7,231.23 km) |
| Brent to Ilfracombe | 4,326.75 mi (6,963.23 km) |
| Brent to Ilkeston | 4,407.74 mi (7,093.57 km) |
| Brent to Ilkley | 4,369.07 mi (7,031.33 km) |
| Brent to Immingham | 4,437.96 mi (7,142.21 km) |
| Brent to Ince-in-Makerfield | 4,345.63 mi (6,993.62 km) |
| Brent to Inverness | 4,218.93 mi (6,789.72 km) |
| Brent to Inverurie | 4,288.95 mi (6,902.41 km) |
| Brent to Ipswich | 4,525.61 mi (7,283.26 km) |
| Brent to Irlam | 4,354.40 mi (7,007.74 km) |
| Brent to Irthlingborough | 4,448.68 mi (7,159.47 km) |
| Brent to Irvine | 4,230.47 mi (6,808.28 km) |
| Brent to Islington | 4,485.88 mi (7,219.32 km) |
