| Caerphilly to Devnya | 1,537.16 mi (2,473.81 km) |
| Caerphilly to Dimitrovgrad | 1,500.15 mi (2,414.27 km) |
| Caerphilly to Dobrich | 1,535.48 mi (2,471.11 km) |
| Caerphilly to Dospat | 1,457.48 mi (2,345.60 km) |
| Caerphilly to Dupnitsa | 1,388.90 mi (2,235.22 km) |
| Caerphilly to Elhovo | 1,535.74 mi (2,471.54 km) |
| Caerphilly to Etropole | 1,402.31 mi (2,256.80 km) |
| Caerphilly to Gabrovo | 1,456.56 mi (2,344.11 km) |
| Caerphilly to Gorna Oryahovitsa | 1,461.63 mi (2,352.27 km) |
| Caerphilly to Gotse Delchev | 1,443.26 mi (2,322.71 km) |
| Caerphilly to Harmanli | 1,517.36 mi (2,441.95 km) |
| Caerphilly to Haskovo | 1,503.52 mi (2,419.68 km) |
| Caerphilly to Ihtiman | 1,410.57 mi (2,270.10 km) |
| Caerphilly to Isperih | 1,487.59 mi (2,394.04 km) |
| Caerphilly to Kardzhali | 1,506.88 mi (2,425.09 km) |
