| Iona to Smolyan | 5,804.25 mi (9,341.04 km) |
| Iona to Sofia | 5,704.90 mi (9,181.16 km) |
| Iona to Sopot | 5,769.13 mi (9,284.53 km) |
| Iona to Sozopol | 5,905.79 mi (9,504.45 km) |
| Iona to Sredets | 5,886.63 mi (9,473.62 km) |
| Iona to Stamboliyski | 5,777.63 mi (9,298.20 km) |
| Iona to Stara Zagora | 5,816.18 mi (9,360.23 km) |
| Iona to Svilengrad | 5,864.15 mi (9,437.43 km) |
| Iona to Svishtov | 5,761.25 mi (9,271.84 km) |
| Iona to Targovishte | 5,827.33 mi (9,378.17 km) |
| Iona to Teteven | 5,738.68 mi (9,235.52 km) |
| Iona to Troyan | 5,759.53 mi (9,269.06 km) |
| Iona to Tryavna | 5,794.24 mi (9,324.93 km) |
| Iona to Tutrakan | 5,799.88 mi (9,334.00 km) |
| Iona to Varna | 5,885.50 mi (9,471.79 km) |
