| Irun to Smolyan | 1,349.95 mi (2,172.53 km) |
| Irun to Sofia | 1,264.87 mi (2,035.62 km) |
| Irun to Sopot | 1,336.37 mi (2,150.67 km) |
| Irun to Sozopol | 1,486.67 mi (2,392.56 km) |
| Irun to Sredets | 1,462.76 mi (2,354.09 km) |
| Irun to Stamboliyski | 1,332.86 mi (2,145.03 km) |
| Irun to Stara Zagora | 1,384.25 mi (2,227.74 km) |
| Irun to Svilengrad | 1,422.02 mi (2,288.52 km) |
| Irun to Svishtov | 1,354.72 mi (2,180.20 km) |
| Irun to Targovishte | 1,419.89 mi (2,285.09 km) |
| Irun to Teteven | 1,308.87 mi (2,106.42 km) |
| Irun to Troyan | 1,331.69 mi (2,143.14 km) |
| Irun to Tryavna | 1,370.88 mi (2,206.22 km) |
| Irun to Tutrakan | 1,412.87 mi (2,273.79 km) |
| Irun to Varna | 1,486.33 mi (2,392.02 km) |
