| Irthlingborough to Ianca | 1,362.48 mi (2,192.69 km) |
| Irthlingborough to Iasi | 1,299.46 mi (2,091.27 km) |
| Irthlingborough to Iernut | 1,181.71 mi (1,901.78 km) |
| Irthlingborough to Ineu | 1,083.55 mi (1,743.80 km) |
| Irthlingborough to Jibou | 1,114.25 mi (1,793.22 km) |
| Irthlingborough to Jilava | 1,334.71 mi (2,148.00 km) |
| Irthlingborough to Jimbolia | 1,061.56 mi (1,708.42 km) |
| Irthlingborough to Liesti | 1,348.09 mi (2,169.54 km) |
| Irthlingborough to Lipova | 1,089.42 mi (1,753.26 km) |
| Irthlingborough to Liteni | 1,244.14 mi (2,002.25 km) |
| Irthlingborough to Ludus | 1,175.19 mi (1,891.29 km) |
| Irthlingborough to Lugoj | 1,113.07 mi (1,791.32 km) |
| Irthlingborough to Lupeni | 1,179.46 mi (1,898.16 km) |
| Irthlingborough to Magurele | 1,332.08 mi (2,143.78 km) |
| Irthlingborough to Mangalia | 1,457.71 mi (2,345.96 km) |
