| Welwyn Garden City to Popovo | 1,353.19 mi (2,177.76 km) |
| Welwyn Garden City to Provadia | 1,409.37 mi (2,268.17 km) |
| Welwyn Garden City to Radnevo | 1,383.64 mi (2,226.75 km) |
| Welwyn Garden City to Radomir | 1,253.06 mi (2,016.60 km) |
| Welwyn Garden City to Rakitovo | 1,322.74 mi (2,128.74 km) |
| Welwyn Garden City to Rakovski | 1,344.95 mi (2,164.49 km) |
| Welwyn Garden City to Razgrad | 1,357.72 mi (2,185.05 km) |
| Welwyn Garden City to Razlog | 1,302.68 mi (2,096.46 km) |
| Welwyn Garden City to Ruse | 1,323.21 mi (2,129.50 km) |
| Welwyn Garden City to Samokov | 1,286.34 mi (2,070.17 km) |
| Welwyn Garden City to Sandanski | 1,309.50 mi (2,107.43 km) |
| Welwyn Garden City to Sevlievo | 1,320.26 mi (2,124.75 km) |
| Welwyn Garden City to Shumen | 1,384.74 mi (2,228.52 km) |
| Welwyn Garden City to Silistra | 1,366.45 mi (2,199.08 km) |
| Welwyn Garden City to Sliven | 1,384.09 mi (2,227.48 km) |
