| Killeen to Smolyan | 6,222.25 mi (10,013.75 km) |
| Killeen to Sofia | 6,118.27 mi (9,846.40 km) |
| Killeen to Sopot | 6,173.17 mi (9,934.75 km) |
| Killeen to Sozopol | 6,291.21 mi (10,124.72 km) |
| Killeen to Sredets | 6,276.63 mi (10,101.26 km) |
| Killeen to Stamboliyski | 6,189.82 mi (9,961.55 km) |
| Killeen to Stara Zagora | 6,216.51 mi (10,004.51 km) |
| Killeen to Svilengrad | 6,268.91 mi (10,088.84 km) |
| Killeen to Svishtov | 6,148.61 mi (9,895.24 km) |
| Killeen to Targovishte | 6,210.49 mi (9,994.81 km) |
| Killeen to Teteven | 6,142.71 mi (9,885.74 km) |
| Killeen to Troyan | 6,160.81 mi (9,914.86 km) |
| Killeen to Tryavna | 6,190.14 mi (9,962.06 km) |
| Killeen to Tutrakan | 6,172.59 mi (9,933.83 km) |
| Killeen to Varna | 6,259.23 mi (10,073.25 km) |
