| Irvine to Smolyan | 1,635.33 mi (2,631.81 km) |
| Irvine to Sofia | 1,531.08 mi (2,464.04 km) |
| Irvine to Sopot | 1,584.54 mi (2,550.07 km) |
| Irvine to Sozopol | 1,703.65 mi (2,741.76 km) |
| Irvine to Sredets | 1,688.40 mi (2,717.22 km) |
| Irvine to Stamboliyski | 1,602.04 mi (2,578.23 km) |
| Irvine to Stara Zagora | 1,627.69 mi (2,619.51 km) |
| Irvine to Svilengrad | 1,680.17 mi (2,703.97 km) |
| Irvine to Svishtov | 1,560.33 mi (2,511.11 km) |
| Irvine to Targovishte | 1,623.00 mi (2,611.96 km) |
| Irvine to Teteven | 1,554.15 mi (2,501.16 km) |
| Irvine to Troyan | 1,572.05 mi (2,529.97 km) |
| Irvine to Tryavna | 1,601.34 mi (2,577.10 km) |
| Irvine to Tutrakan | 1,587.25 mi (2,554.42 km) |
| Irvine to Varna | 1,674.08 mi (2,694.18 km) |
