| Caerfyrddin to Popovo | 1,525.61 mi (2,455.23 km) |
| Caerfyrddin to Provadia | 1,582.36 mi (2,546.57 km) |
| Caerfyrddin to Radnevo | 1,554.15 mi (2,501.16 km) |
| Caerfyrddin to Radomir | 1,420.81 mi (2,286.57 km) |
| Caerfyrddin to Rakitovo | 1,490.67 mi (2,399.01 km) |
| Caerfyrddin to Rakovski | 1,514.49 mi (2,437.33 km) |
| Caerfyrddin to Razgrad | 1,530.59 mi (2,463.24 km) |
| Caerfyrddin to Razlog | 1,469.62 mi (2,365.12 km) |
| Caerfyrddin to Ruse | 1,496.11 mi (2,407.75 km) |
| Caerfyrddin to Samokov | 1,454.38 mi (2,340.60 km) |
| Caerfyrddin to Sandanski | 1,475.47 mi (2,374.53 km) |
| Caerfyrddin to Sevlievo | 1,491.26 mi (2,399.96 km) |
| Caerfyrddin to Shumen | 1,557.54 mi (2,506.62 km) |
| Caerfyrddin to Silistra | 1,540.46 mi (2,479.13 km) |
| Caerfyrddin to Sliven | 1,555.57 mi (2,503.45 km) |
