| Horbury to Popovo | 1,444.59 mi (2,324.85 km) |
| Horbury to Provadia | 1,498.69 mi (2,411.91 km) |
| Horbury to Radnevo | 1,480.03 mi (2,381.87 km) |
| Horbury to Radomir | 1,355.69 mi (2,181.77 km) |
| Horbury to Rakitovo | 1,424.75 mi (2,292.91 km) |
| Horbury to Rakovski | 1,443.69 mi (2,323.39 km) |
| Horbury to Razgrad | 1,447.67 mi (2,329.80 km) |
| Horbury to Razlog | 1,406.56 mi (2,263.64 km) |
| Horbury to Ruse | 1,413.20 mi (2,274.32 km) |
| Horbury to Samokov | 1,388.31 mi (2,234.26 km) |
| Horbury to Sandanski | 1,414.95 mi (2,277.14 km) |
| Horbury to Sevlievo | 1,415.69 mi (2,278.33 km) |
| Horbury to Shumen | 1,474.79 mi (2,373.44 km) |
| Horbury to Silistra | 1,452.07 mi (2,336.88 km) |
| Horbury to Sliven | 1,478.02 mi (2,378.64 km) |
