| Caerphilly to Popovo | 1,475.85 mi (2,375.15 km) |
| Caerphilly to Provadia | 1,532.77 mi (2,466.75 km) |
| Caerphilly to Radnevo | 1,503.97 mi (2,420.41 km) |
| Caerphilly to Radomir | 1,370.30 mi (2,205.28 km) |
| Caerphilly to Rakitovo | 1,440.17 mi (2,317.73 km) |
| Caerphilly to Rakovski | 1,464.17 mi (2,356.35 km) |
| Caerphilly to Razgrad | 1,480.96 mi (2,383.37 km) |
| Caerphilly to Razlog | 1,419.03 mi (2,283.71 km) |
| Caerphilly to Ruse | 1,446.49 mi (2,327.90 km) |
| Caerphilly to Samokov | 1,403.89 mi (2,259.35 km) |
| Caerphilly to Sandanski | 1,424.82 mi (2,293.02 km) |
| Caerphilly to Sevlievo | 1,441.19 mi (2,319.37 km) |
| Caerphilly to Shumen | 1,507.89 mi (2,426.71 km) |
| Caerphilly to Silistra | 1,491.25 mi (2,399.94 km) |
| Caerphilly to Sliven | 1,505.59 mi (2,423.01 km) |
