| Houghton Regis to Devnya | 1,428.94 mi (2,299.66 km) |
| Houghton Regis to Dimitrovgrad | 1,396.27 mi (2,247.08 km) |
| Houghton Regis to Dobrich | 1,426.41 mi (2,295.59 km) |
| Houghton Regis to Dospat | 1,356.35 mi (2,182.83 km) |
| Houghton Regis to Dupnitsa | 1,287.76 mi (2,072.46 km) |
| Houghton Regis to Elhovo | 1,430.51 mi (2,302.19 km) |
| Houghton Regis to Etropole | 1,298.63 mi (2,089.95 km) |
| Houghton Regis to Gabrovo | 1,351.24 mi (2,174.61 km) |
| Houghton Regis to Gorna Oryahovitsa | 1,355.36 mi (2,181.24 km) |
| Houghton Regis to Gotse Delchev | 1,342.94 mi (2,161.25 km) |
| Houghton Regis to Harmanli | 1,413.36 mi (2,274.59 km) |
| Houghton Regis to Haskovo | 1,399.92 mi (2,252.96 km) |
| Houghton Regis to Ihtiman | 1,308.06 mi (2,105.12 km) |
| Houghton Regis to Isperih | 1,379.10 mi (2,219.44 km) |
| Houghton Regis to Kardzhali | 1,404.15 mi (2,259.75 km) |
