| Laredo to Smolyan | 1,430.73 mi (2,302.54 km) |
| Laredo to Sofia | 1,345.06 mi (2,164.67 km) |
| Laredo to Sopot | 1,416.43 mi (2,279.52 km) |
| Laredo to Sozopol | 1,566.55 mi (2,521.12 km) |
| Laredo to Sredets | 1,542.76 mi (2,482.83 km) |
| Laredo to Stamboliyski | 1,413.32 mi (2,274.52 km) |
| Laredo to Stara Zagora | 1,464.37 mi (2,356.68 km) |
| Laredo to Svilengrad | 1,502.53 mi (2,418.09 km) |
| Laredo to Svishtov | 1,433.85 mi (2,307.55 km) |
| Laredo to Targovishte | 1,499.22 mi (2,412.76 km) |
| Laredo to Teteven | 1,388.77 mi (2,235.01 km) |
| Laredo to Troyan | 1,411.56 mi (2,271.69 km) |
| Laredo to Tryavna | 1,450.68 mi (2,334.64 km) |
| Laredo to Tutrakan | 1,491.41 mi (2,400.19 km) |
| Laredo to Varna | 1,565.53 mi (2,519.48 km) |
