| Irthlingborough to Imatra | 1,254.89 mi (2,019.55 km) |
| Irthlingborough to Jakobstad | 1,146.83 mi (1,845.64 km) |
| Irthlingborough to Jamsa | 1,159.11 mi (1,865.40 km) |
| Irthlingborough to Janakkala | 1,118.38 mi (1,799.87 km) |
| Irthlingborough to Jarvenpaa | 1,122.21 mi (1,806.02 km) |
| Irthlingborough to Joensuu | 1,314.48 mi (2,115.45 km) |
| Irthlingborough to Joutseno | 1,245.25 mi (2,004.03 km) |
| Irthlingborough to Jyvaskyla | 1,185.87 mi (1,908.48 km) |
| Irthlingborough to Jyvaskylan Maalaiskunta | 1,187.16 mi (1,910.55 km) |
| Irthlingborough to Kaarina | 1,033.38 mi (1,663.06 km) |
| Irthlingborough to Kajaani | 1,298.93 mi (2,090.42 km) |
| Irthlingborough to Kalajoki | 1,200.93 mi (1,932.70 km) |
| Irthlingborough to Kangasala | 1,114.46 mi (1,793.55 km) |
| Irthlingborough to Kankaanpaa | 1,074.84 mi (1,729.79 km) |
| Irthlingborough to Karhula | 1,182.91 mi (1,903.71 km) |
