| Knottingley to Popovo | 1,433.65 mi (2,307.23 km) |
| Knottingley to Provadia | 1,487.61 mi (2,394.07 km) |
| Knottingley to Radnevo | 1,469.41 mi (2,364.79 km) |
| Knottingley to Radomir | 1,345.58 mi (2,165.50 km) |
| Knottingley to Rakitovo | 1,414.57 mi (2,276.54 km) |
| Knottingley to Rakovski | 1,433.25 mi (2,306.59 km) |
| Knottingley to Razgrad | 1,436.63 mi (2,312.03 km) |
| Knottingley to Razlog | 1,396.54 mi (2,247.51 km) |
| Knottingley to Ruse | 1,402.17 mi (2,256.57 km) |
| Knottingley to Samokov | 1,378.13 mi (2,217.89 km) |
| Knottingley to Sandanski | 1,405.07 mi (2,261.24 km) |
| Knottingley to Sevlievo | 1,405.02 mi (2,261.16 km) |
| Knottingley to Shumen | 1,463.75 mi (2,355.68 km) |
| Knottingley to Silistra | 1,440.78 mi (2,318.71 km) |
| Knottingley to Sliven | 1,467.23 mi (2,361.29 km) |
