| Waco to Smolyan | 6,176.10 mi (9,939.47 km) |
| Waco to Sofia | 6,072.12 mi (9,772.13 km) |
| Waco to Sopot | 6,127.07 mi (9,860.56 km) |
| Waco to Sozopol | 6,245.22 mi (10,050.71 km) |
| Waco to Sredets | 6,230.62 mi (10,027.21 km) |
| Waco to Stamboliyski | 6,143.68 mi (9,887.30 km) |
| Waco to Stara Zagora | 6,170.43 mi (9,930.35 km) |
| Waco to Svilengrad | 6,222.82 mi (10,014.66 km) |
| Waco to Svishtov | 6,102.59 mi (9,821.18 km) |
| Waco to Targovishte | 6,164.50 mi (9,920.80 km) |
| Waco to Teteven | 6,096.61 mi (9,811.54 km) |
| Waco to Troyan | 6,114.72 mi (9,840.69 km) |
| Waco to Tryavna | 6,144.08 mi (9,887.94 km) |
| Waco to Tutrakan | 6,126.66 mi (9,859.91 km) |
| Waco to Varna | 6,213.31 mi (9,999.35 km) |
