| Seguin to Smolyan | 6,310.90 mi (10,156.41 km) |
| Seguin to Sofia | 6,207.03 mi (9,989.25 km) |
| Seguin to Sopot | 6,262.55 mi (10,078.61 km) |
| Seguin to Sozopol | 6,381.81 mi (10,270.53 km) |
| Seguin to Sredets | 6,366.96 mi (10,246.63 km) |
| Seguin to Stamboliyski | 6,278.75 mi (10,104.68 km) |
| Seguin to Stara Zagora | 6,306.17 mi (10,148.81 km) |
| Seguin to Svilengrad | 6,358.39 mi (10,232.85 km) |
| Seguin to Svishtov | 6,238.91 mi (10,040.55 km) |
| Seguin to Targovishte | 6,301.10 mi (10,140.63 km) |
| Seguin to Teteven | 6,232.05 mi (10,029.52 km) |
| Seguin to Troyan | 6,250.33 mi (10,058.94 km) |
| Seguin to Tryavna | 6,280.01 mi (10,106.70 km) |
| Seguin to Tutrakan | 6,263.71 mi (10,080.47 km) |
| Seguin to Varna | 6,350.42 mi (10,220.01 km) |
