| Council Bluffs to Smolyan | 5,616.00 mi (9,038.08 km) |
| Council Bluffs to Sofia | 5,511.71 mi (8,870.25 km) |
| Council Bluffs to Sopot | 5,562.04 mi (8,951.23 km) |
| Council Bluffs to Sozopol | 5,671.17 mi (9,126.87 km) |
| Council Bluffs to Sredets | 5,658.54 mi (9,106.53 km) |
| Council Bluffs to Stamboliyski | 5,581.70 mi (8,982.87 km) |
| Council Bluffs to Stara Zagora | 5,603.28 mi (9,017.61 km) |
| Council Bluffs to Svilengrad | 5,656.65 mi (9,103.50 km) |
| Council Bluffs to Svishtov | 5,531.35 mi (8,901.85 km) |
| Council Bluffs to Targovishte | 5,590.74 mi (8,997.43 km) |
| Council Bluffs to Teteven | 5,532.03 mi (8,902.94 km) |
| Council Bluffs to Troyan | 5,548.77 mi (8,929.88 km) |
| Council Bluffs to Tryavna | 5,575.56 mi (8,972.99 km) |
| Council Bluffs to Tutrakan | 5,549.49 mi (8,931.04 km) |
| Council Bluffs to Varna | 5,635.29 mi (9,069.13 km) |
