| Hounslow to Popovo | 1,354.86 mi (2,180.43 km) |
| Hounslow to Provadia | 1,411.48 mi (2,271.56 km) |
| Hounslow to Radnevo | 1,384.05 mi (2,227.42 km) |
| Hounslow to Radomir | 1,251.97 mi (2,014.84 km) |
| Hounslow to Rakitovo | 1,321.75 mi (2,127.15 km) |
| Hounslow to Rakovski | 1,344.80 mi (2,164.25 km) |
| Hounslow to Razgrad | 1,359.73 mi (2,188.27 km) |
| Hounslow to Razlog | 1,301.21 mi (2,094.09 km) |
| Hounslow to Ruse | 1,325.24 mi (2,132.77 km) |
| Hounslow to Samokov | 1,285.40 mi (2,068.65 km) |
| Hounslow to Sandanski | 1,307.59 mi (2,104.36 km) |
| Hounslow to Sevlievo | 1,320.97 mi (2,125.90 km) |
| Hounslow to Shumen | 1,386.70 mi (2,231.67 km) |
| Hounslow to Silistra | 1,369.45 mi (2,203.91 km) |
| Hounslow to Sliven | 1,385.11 mi (2,229.12 km) |
