| Willmar to Smolyan | 5,387.48 mi (8,670.31 km) |
| Willmar to Sofia | 5,283.33 mi (8,502.69 km) |
| Willmar to Sopot | 5,331.68 mi (8,580.51 km) |
| Willmar to Sozopol | 5,436.98 mi (8,749.97 km) |
| Willmar to Sredets | 5,425.15 mi (8,730.94 km) |
| Willmar to Stamboliyski | 5,352.51 mi (8,614.03 km) |
| Willmar to Stara Zagora | 5,371.98 mi (8,645.37 km) |
| Willmar to Svilengrad | 5,425.61 mi (8,731.68 km) |
| Willmar to Svishtov | 5,298.58 mi (8,527.25 km) |
| Willmar to Targovishte | 5,356.84 mi (8,621.00 km) |
| Willmar to Teteven | 5,301.93 mi (8,532.63 km) |
| Willmar to Troyan | 5,318.08 mi (8,558.62 km) |
| Willmar to Tryavna | 5,343.78 mi (8,599.98 km) |
| Willmar to Tutrakan | 5,314.32 mi (8,552.57 km) |
| Willmar to Varna | 5,399.61 mi (8,689.84 km) |
