| Alenquer to Ifield | 936.81 mi (1,507.65 km) |
| Alenquer to Ilford | 969.08 mi (1,559.58 km) |
| Alenquer to Ilfracombe | 872.79 mi (1,404.61 km) |
| Alenquer to Ilkeston | 1,029.08 mi (1,656.14 km) |
| Alenquer to Ilkley | 1,081.90 mi (1,741.14 km) |
| Alenquer to Immingham | 1,088.34 mi (1,751.52 km) |
| Alenquer to Ince-in-Makerfield | 1,045.95 mi (1,683.30 km) |
| Alenquer to Inverness | 1,291.39 mi (2,078.29 km) |
| Alenquer to Inverurie | 1,294.69 mi (2,083.61 km) |
| Alenquer to Ipswich | 1,022.52 mi (1,645.58 km) |
| Alenquer to Irlam | 1,042.22 mi (1,677.29 km) |
| Alenquer to Irthlingborough | 1,001.21 mi (1,611.30 km) |
| Alenquer to Irvine | 1,162.33 mi (1,870.59 km) |
| Alenquer to Islington | 964.20 mi (1,551.73 km) |
| Alenquer to Iver | 954.30 mi (1,535.79 km) |
