| Kirkland to Smolyan | 5,944.59 mi (9,566.89 km) |
| Kirkland to Sofia | 5,846.73 mi (9,409.40 km) |
| Kirkland to Sopot | 5,877.01 mi (9,458.14 km) |
| Kirkland to Sozopol | 5,945.17 mi (9,567.82 km) |
| Kirkland to Sredets | 5,940.80 mi (9,560.80 km) |
| Kirkland to Stamboliyski | 5,906.11 mi (9,504.96 km) |
| Kirkland to Stara Zagora | 5,907.63 mi (9,507.41 km) |
| Kirkland to Svilengrad | 5,960.71 mi (9,592.83 km) |
| Kirkland to Svishtov | 5,825.91 mi (9,375.89 km) |
| Kirkland to Targovishte | 5,871.64 mi (9,449.49 km) |
| Kirkland to Teteven | 5,850.81 mi (9,415.97 km) |
| Kirkland to Troyan | 5,861.41 mi (9,433.02 km) |
| Kirkland to Tryavna | 5,876.93 mi (9,458.01 km) |
| Kirkland to Tutrakan | 5,820.45 mi (9,367.10 km) |
| Kirkland to Varna | 5,896.84 mi (9,490.05 km) |
