| Azcoitia to Smolyan | 1,376.96 mi (2,216.00 km) |
| Azcoitia to Sofia | 1,292.27 mi (2,079.71 km) |
| Azcoitia to Sopot | 1,363.82 mi (2,194.86 km) |
| Azcoitia to Sozopol | 1,514.20 mi (2,436.88 km) |
| Azcoitia to Sredets | 1,490.25 mi (2,398.32 km) |
| Azcoitia to Stamboliyski | 1,360.10 mi (2,188.86 km) |
| Azcoitia to Stara Zagora | 1,411.68 mi (2,271.88 km) |
| Azcoitia to Svilengrad | 1,449.23 mi (2,332.30 km) |
| Azcoitia to Svishtov | 1,382.53 mi (2,224.97 km) |
| Azcoitia to Targovishte | 1,447.64 mi (2,329.75 km) |
| Azcoitia to Teteven | 1,336.40 mi (2,150.73 km) |
| Azcoitia to Troyan | 1,359.23 mi (2,187.47 km) |
| Azcoitia to Tryavna | 1,398.46 mi (2,250.60 km) |
| Azcoitia to Tutrakan | 1,440.84 mi (2,318.81 km) |
| Azcoitia to Varna | 1,514.12 mi (2,436.75 km) |
