| Caernarfon to Smolyan | 1,557.66 mi (2,506.81 km) |
| Caernarfon to Sofia | 1,454.29 mi (2,340.46 km) |
| Caernarfon to Sopot | 1,512.53 mi (2,434.18 km) |
| Caernarfon to Sozopol | 1,640.41 mi (2,639.99 km) |
| Caernarfon to Sredets | 1,623.17 mi (2,612.23 km) |
| Caernarfon to Stamboliyski | 1,526.55 mi (2,456.75 km) |
| Caernarfon to Stara Zagora | 1,557.65 mi (2,506.79 km) |
| Caernarfon to Svilengrad | 1,608.61 mi (2,588.80 km) |
| Caernarfon to Svishtov | 1,495.74 mi (2,407.15 km) |
| Caernarfon to Targovishte | 1,560.51 mi (2,511.39 km) |
| Caernarfon to Teteven | 1,481.88 mi (2,384.86 km) |
| Caernarfon to Troyan | 1,501.18 mi (2,415.91 km) |
| Caernarfon to Tryavna | 1,533.09 mi (2,467.27 km) |
| Caernarfon to Tutrakan | 1,529.38 mi (2,461.30 km) |
| Caernarfon to Varna | 1,615.78 mi (2,600.35 km) |
