| Harpenden to Popovo | 1,359.96 mi (2,188.65 km) |
| Harpenden to Provadia | 1,416.16 mi (2,279.09 km) |
| Harpenden to Radnevo | 1,390.35 mi (2,237.55 km) |
| Harpenden to Radomir | 1,259.67 mi (2,027.25 km) |
| Harpenden to Rakitovo | 1,329.36 mi (2,139.40 km) |
| Harpenden to Rakovski | 1,351.63 mi (2,175.24 km) |
| Harpenden to Razgrad | 1,364.51 mi (2,195.96 km) |
| Harpenden to Razlog | 1,309.27 mi (2,107.06 km) |
| Harpenden to Ruse | 1,330.00 mi (2,140.42 km) |
| Harpenden to Samokov | 1,292.97 mi (2,080.83 km) |
| Harpenden to Sandanski | 1,316.05 mi (2,117.98 km) |
| Harpenden to Sevlievo | 1,326.99 mi (2,135.58 km) |
| Harpenden to Shumen | 1,391.52 mi (2,239.44 km) |
| Harpenden to Silistra | 1,373.26 mi (2,210.05 km) |
| Harpenden to Sliven | 1,390.83 mi (2,238.33 km) |
