| Oulu to Smolyan | 1,619.20 mi (2,605.86 km) |
| Oulu to Sofia | 1,544.02 mi (2,484.86 km) |
| Oulu to Sopot | 1,545.47 mi (2,487.20 km) |
| Oulu to Sozopol | 1,563.76 mi (2,516.63 km) |
| Oulu to Sredets | 1,567.40 mi (2,522.49 km) |
| Oulu to Stamboliyski | 1,581.34 mi (2,544.93 km) |
| Oulu to Stara Zagora | 1,560.20 mi (2,510.91 km) |
| Oulu to Svilengrad | 1,606.50 mi (2,585.41 km) |
| Oulu to Svishtov | 1,478.43 mi (2,379.31 km) |
| Oulu to Targovishte | 1,504.38 mi (2,421.06 km) |
| Oulu to Teteven | 1,527.51 mi (2,458.29 km) |
| Oulu to Troyan | 1,529.38 mi (2,461.30 km) |
| Oulu to Tryavna | 1,530.23 mi (2,462.67 km) |
| Oulu to Tutrakan | 1,449.16 mi (2,332.19 km) |
| Oulu to Varna | 1,509.05 mi (2,428.57 km) |
