| Northport to Ickenham | 4,346.69 mi (6,995.31 km) |
| Northport to Ifield | 4,366.93 mi (7,027.89 km) |
| Northport to Ilford | 4,368.20 mi (7,029.94 km) |
| Northport to Ilfracombe | 4,205.02 mi (6,767.33 km) |
| Northport to Ilkeston | 4,279.61 mi (6,887.37 km) |
| Northport to Ilkley | 4,238.62 mi (6,821.40 km) |
| Northport to Immingham | 4,307.54 mi (6,932.32 km) |
| Northport to Ince-in-Makerfield | 4,216.61 mi (6,785.98 km) |
| Northport to Inverness | 4,079.97 mi (6,566.08 km) |
| Northport to Inverurie | 4,149.86 mi (6,678.56 km) |
| Northport to Ipswich | 4,398.55 mi (7,078.78 km) |
| Northport to Irlam | 4,225.55 mi (6,800.37 km) |
| Northport to Irthlingborough | 4,321.93 mi (6,955.48 km) |
| Northport to Irvine | 4,096.65 mi (6,592.92 km) |
| Northport to Islington | 4,360.94 mi (7,018.26 km) |
