| Peoria to Smolyan | 5,421.50 mi (8,725.07 km) |
| Peoria to Sofia | 5,317.34 mi (8,557.44 km) |
| Peoria to Sopot | 5,371.07 mi (8,643.90 km) |
| Peoria to Sozopol | 5,487.11 mi (8,830.66 km) |
| Peoria to Sredets | 5,472.95 mi (8,807.86 km) |
| Peoria to Stamboliyski | 5,388.52 mi (8,671.99 km) |
| Peoria to Stara Zagora | 5,413.92 mi (8,712.86 km) |
| Peoria to Svilengrad | 5,466.60 mi (8,797.64 km) |
| Peoria to Svishtov | 5,345.03 mi (8,601.99 km) |
| Peoria to Targovishte | 5,406.40 mi (8,700.76 km) |
| Peoria to Teteven | 5,340.70 mi (8,595.03 km) |
| Peoria to Troyan | 5,358.47 mi (8,623.62 km) |
| Peoria to Tryavna | 5,387.20 mi (8,669.86 km) |
| Peoria to Tutrakan | 5,367.81 mi (8,638.66 km) |
| Peoria to Varna | 5,454.34 mi (8,777.91 km) |
