| Irthlingborough to Lisburn | 269.60 mi (433.87 km) |
| Irthlingborough to Liskeard | 210.36 mi (338.54 km) |
| Irthlingborough to Litherland | 127.19 mi (204.69 km) |
| Irthlingborough to Little Bookham | 72.74 mi (117.06 km) |
| Irthlingborough to Little Hulton | 112.19 mi (180.56 km) |
| Irthlingborough to Little Lever | 112.54 mi (181.12 km) |
| Irthlingborough to Littleborough | 110.12 mi (177.23 km) |
| Irthlingborough to Littlehampton | 104.70 mi (168.49 km) |
| Irthlingborough to Littleover | 54.90 mi (88.35 km) |
| Irthlingborough to Littleport | 39.81 mi (64.06 km) |
| Irthlingborough to Liverpool | 124.25 mi (199.97 km) |
| Irthlingborough to Liversedge | 105.48 mi (169.76 km) |
| Irthlingborough to Livingston | 272.52 mi (438.58 km) |
| Irthlingborough to Llanelli | 157.28 mi (253.12 km) |
| Irthlingborough to Llantrisant | 129.43 mi (208.29 km) |
