| Killingworth to Popovo | 1,476.79 mi (2,376.66 km) |
| Killingworth to Provadia | 1,528.99 mi (2,460.67 km) |
| Killingworth to Radnevo | 1,516.14 mi (2,439.99 km) |
| Killingworth to Radomir | 1,397.53 mi (2,249.11 km) |
| Killingworth to Rakitovo | 1,465.78 mi (2,358.95 km) |
| Killingworth to Rakovski | 1,481.89 mi (2,384.86 km) |
| Killingworth to Razgrad | 1,478.68 mi (2,379.71 km) |
| Killingworth to Razlog | 1,449.25 mi (2,332.34 km) |
| Killingworth to Ruse | 1,444.40 mi (2,324.54 km) |
| Killingworth to Samokov | 1,429.44 mi (2,300.47 km) |
| Killingworth to Sandanski | 1,458.96 mi (2,347.97 km) |
| Killingworth to Sevlievo | 1,451.28 mi (2,335.61 km) |
| Killingworth to Shumen | 1,505.77 mi (2,423.30 km) |
| Killingworth to Silistra | 1,479.64 mi (2,381.24 km) |
| Killingworth to Sliven | 1,512.12 mi (2,433.53 km) |
