| Williston to Smolyan | 5,480.67 mi (8,820.29 km) |
| Williston to Sofia | 5,377.86 mi (8,654.83 km) |
| Williston to Sopot | 5,419.67 mi (8,722.11 km) |
| Williston to Sozopol | 5,511.70 mi (8,870.22 km) |
| Williston to Sredets | 5,502.63 mi (8,855.62 km) |
| Williston to Stamboliyski | 5,443.95 mi (8,761.19 km) |
| Williston to Stara Zagora | 5,456.63 mi (8,781.60 km) |
| Williston to Svilengrad | 5,510.64 mi (8,868.51 km) |
| Williston to Svishtov | 5,379.19 mi (8,656.97 km) |
| Williston to Targovishte | 5,433.23 mi (8,743.94 km) |
| Williston to Teteven | 5,390.98 mi (8,675.94 km) |
| Williston to Troyan | 5,405.13 mi (8,698.72 km) |
| Williston to Tryavna | 5,427.15 mi (8,734.16 km) |
| Williston to Tutrakan | 5,386.88 mi (8,669.34 km) |
| Williston to Varna | 5,469.68 mi (8,802.61 km) |
