| Letchworth to Popovo | 1,357.84 mi (2,185.24 km) |
| Letchworth to Provadia | 1,413.82 mi (2,275.32 km) |
| Letchworth to Radnevo | 1,388.83 mi (2,235.11 km) |
| Letchworth to Radomir | 1,258.91 mi (2,026.02 km) |
| Letchworth to Rakitovo | 1,328.54 mi (2,138.08 km) |
| Letchworth to Rakovski | 1,350.40 mi (2,173.25 km) |
| Letchworth to Razgrad | 1,362.22 mi (2,192.28 km) |
| Letchworth to Razlog | 1,308.69 mi (2,106.13 km) |
| Letchworth to Ruse | 1,327.70 mi (2,136.73 km) |
| Letchworth to Samokov | 1,292.13 mi (2,079.49 km) |
| Letchworth to Sandanski | 1,315.69 mi (2,117.40 km) |
| Letchworth to Sevlievo | 1,325.33 mi (2,132.92 km) |
| Letchworth to Shumen | 1,389.25 mi (2,235.79 km) |
| Letchworth to Silistra | 1,370.49 mi (2,205.59 km) |
| Letchworth to Sliven | 1,389.02 mi (2,235.41 km) |
