| Irthlingborough to Glyka Nera | 1,536.31 mi (2,472.45 km) |
| Irthlingborough to Grevena | 1,341.94 mi (2,159.64 km) |
| Irthlingborough to Ialysos | 1,776.24 mi (2,858.58 km) |
| Irthlingborough to Ilion | 1,528.78 mi (2,460.33 km) |
| Irthlingborough to Ilioupoli | 1,535.74 mi (2,471.53 km) |
| Irthlingborough to Ioannina | 1,342.48 mi (2,160.50 km) |
| Irthlingborough to Irakleio | 1,721.92 mi (2,771.16 km) |
| Irthlingborough to Irakleio | 1,530.35 mi (2,462.85 km) |
| Irthlingborough to Kaisariani | 1,534.24 mi (2,469.12 km) |
| Irthlingborough to Kalamaria | 1,373.97 mi (2,211.20 km) |
| Irthlingborough to Kalamata | 1,524.67 mi (2,453.72 km) |
| Irthlingborough to Kallithea | 1,533.06 mi (2,467.23 km) |
| Irthlingborough to Kalymnos | 1,703.36 mi (2,741.29 km) |
| Irthlingborough to Kalyvia Thorikou | 1,546.95 mi (2,489.57 km) |
| Irthlingborough to Kamatero | 1,527.86 mi (2,458.85 km) |
