| Rhondda to Popovo | 1,484.75 mi (2,389.48 km) |
| Rhondda to Provadia | 1,541.66 mi (2,481.06 km) |
| Rhondda to Radnevo | 1,512.91 mi (2,434.80 km) |
| Rhondda to Radomir | 1,379.25 mi (2,219.69 km) |
| Rhondda to Rakitovo | 1,449.12 mi (2,332.14 km) |
| Rhondda to Rakovski | 1,473.12 mi (2,370.75 km) |
| Rhondda to Razgrad | 1,489.85 mi (2,397.68 km) |
| Rhondda to Razlog | 1,427.98 mi (2,298.12 km) |
| Rhondda to Ruse | 1,455.38 mi (2,342.21 km) |
| Rhondda to Samokov | 1,412.85 mi (2,273.76 km) |
| Rhondda to Sandanski | 1,433.77 mi (2,307.43 km) |
| Rhondda to Sevlievo | 1,450.12 mi (2,333.74 km) |
| Rhondda to Shumen | 1,516.78 mi (2,441.02 km) |
| Rhondda to Silistra | 1,500.10 mi (2,414.18 km) |
| Rhondda to Sliven | 1,514.51 mi (2,437.37 km) |
