| Irthlingborough to Islahiye | 2,080.69 mi (3,348.55 km) |
| Irthlingborough to Isparta | 1,802.39 mi (2,900.67 km) |
| Irthlingborough to Istanbul | 1,589.03 mi (2,557.30 km) |
| Irthlingborough to Izmir | 1,638.03 mi (2,636.16 km) |
| Irthlingborough to Kadinhani | 1,845.53 mi (2,970.10 km) |
| Irthlingborough to Kadirli | 2,042.91 mi (3,287.75 km) |
| Irthlingborough to Kagithane | 1,586.94 mi (2,553.93 km) |
| Irthlingborough to Kahramanmaras | 2,067.02 mi (3,326.55 km) |
| Irthlingborough to Kahta | 2,127.39 mi (3,423.70 km) |
| Irthlingborough to Kaman | 1,855.59 mi (2,986.28 km) |
| Irthlingborough to Kangal | 2,011.54 mi (3,237.26 km) |
| Irthlingborough to Kapakli | 1,535.30 mi (2,470.82 km) |
| Irthlingborough to Karaagac | 2,081.91 mi (3,350.52 km) |
| Irthlingborough to Karaagac | 1,536.09 mi (2,472.10 km) |
| Irthlingborough to Karabuk | 1,730.58 mi (2,785.11 km) |
