| Houghton Regis to Glyka Nera | 1,518.50 mi (2,443.79 km) |
| Houghton Regis to Grevena | 1,324.20 mi (2,131.10 km) |
| Houghton Regis to Ialysos | 1,759.92 mi (2,832.31 km) |
| Houghton Regis to Ilion | 1,510.91 mi (2,431.57 km) |
| Houghton Regis to Ilioupoli | 1,517.83 mi (2,442.71 km) |
| Houghton Regis to Ioannina | 1,324.00 mi (2,130.77 km) |
| Houghton Regis to Irakleio | 1,703.15 mi (2,740.96 km) |
| Houghton Regis to Irakleio | 1,512.53 mi (2,434.18 km) |
| Houghton Regis to Kaisariani | 1,516.36 mi (2,440.34 km) |
| Houghton Regis to Kalamaria | 1,357.70 mi (2,185.00 km) |
| Houghton Regis to Kalamata | 1,505.11 mi (2,422.25 km) |
| Houghton Regis to Kallithea | 1,515.13 mi (2,438.37 km) |
| Houghton Regis to Kalymnos | 1,686.74 mi (2,714.55 km) |
| Houghton Regis to Kalyvia Thorikou | 1,529.07 mi (2,460.80 km) |
| Houghton Regis to Kamatero | 1,510.01 mi (2,430.13 km) |
