| Portimao to Ifield | 1,049.37 mi (1,688.80 km) |
| Portimao to Ilford | 1,081.87 mi (1,741.09 km) |
| Portimao to Ilfracombe | 996.10 mi (1,603.07 km) |
| Portimao to Ilkeston | 1,148.10 mi (1,847.69 km) |
| Portimao to Ilkley | 1,203.31 mi (1,936.54 km) |
| Portimao to Immingham | 1,205.98 mi (1,940.83 km) |
| Portimao to Ince-in-Makerfield | 1,168.48 mi (1,880.48 km) |
| Portimao to Inverness | 1,419.18 mi (2,283.95 km) |
| Portimao to Inverurie | 1,420.06 mi (2,285.37 km) |
| Portimao to Ipswich | 1,133.66 mi (1,824.45 km) |
| Portimao to Irlam | 1,164.28 mi (1,873.72 km) |
| Portimao to Irthlingborough | 1,117.48 mi (1,798.41 km) |
| Portimao to Irvine | 1,289.87 mi (2,075.84 km) |
| Portimao to Islington | 1,077.47 mi (1,734.02 km) |
| Portimao to Iver | 1,068.63 mi (1,719.79 km) |
