| Azpeitia to Smolyan | 1,374.67 mi (2,212.31 km) |
| Azpeitia to Sofia | 1,289.99 mi (2,076.03 km) |
| Azpeitia to Sopot | 1,361.54 mi (2,191.18 km) |
| Azpeitia to Sozopol | 1,511.92 mi (2,433.20 km) |
| Azpeitia to Sredets | 1,487.96 mi (2,394.64 km) |
| Azpeitia to Stamboliyski | 1,357.81 mi (2,185.18 km) |
| Azpeitia to Stara Zagora | 1,409.39 mi (2,268.20 km) |
| Azpeitia to Svilengrad | 1,446.94 mi (2,328.62 km) |
| Azpeitia to Svishtov | 1,380.25 mi (2,221.30 km) |
| Azpeitia to Targovishte | 1,445.36 mi (2,326.08 km) |
| Azpeitia to Teteven | 1,334.12 mi (2,147.05 km) |
| Azpeitia to Troyan | 1,356.95 mi (2,183.79 km) |
| Azpeitia to Tryavna | 1,396.17 mi (2,246.92 km) |
| Azpeitia to Tutrakan | 1,438.57 mi (2,315.16 km) |
| Azpeitia to Varna | 1,511.85 mi (2,433.08 km) |
