| Borehamwood to Popovo | 1,353.84 mi (2,178.79 km) |
| Borehamwood to Provadia | 1,410.21 mi (2,269.52 km) |
| Borehamwood to Radnevo | 1,383.74 mi (2,226.91 km) |
| Borehamwood to Radomir | 1,252.49 mi (2,015.69 km) |
| Borehamwood to Rakitovo | 1,322.22 mi (2,127.91 km) |
| Borehamwood to Rakovski | 1,344.80 mi (2,164.25 km) |
| Borehamwood to Razgrad | 1,358.52 mi (2,186.32 km) |
| Borehamwood to Razlog | 1,301.95 mi (2,095.29 km) |
| Borehamwood to Ruse | 1,324.01 mi (2,130.79 km) |
| Borehamwood to Samokov | 1,285.84 mi (2,069.37 km) |
| Borehamwood to Sandanski | 1,308.58 mi (2,105.95 km) |
| Borehamwood to Sevlievo | 1,320.48 mi (2,125.12 km) |
| Borehamwood to Shumen | 1,385.51 mi (2,229.77 km) |
| Borehamwood to Silistra | 1,367.68 mi (2,201.06 km) |
| Borehamwood to Sliven | 1,384.45 mi (2,228.06 km) |
