| Willstatt to Smolyan | 947.58 mi (1,524.99 km) |
| Willstatt to Sofia | 845.84 mi (1,361.24 km) |
| Willstatt to Sopot | 908.15 mi (1,461.53 km) |
| Willstatt to Sozopol | 1,044.65 mi (1,681.19 km) |
| Willstatt to Sredets | 1,025.14 mi (1,649.80 km) |
| Willstatt to Stamboliyski | 918.61 mi (1,478.36 km) |
| Willstatt to Stara Zagora | 954.87 mi (1,536.71 km) |
| Willstatt to Svilengrad | 1,003.67 mi (1,615.25 km) |
| Willstatt to Svishtov | 900.50 mi (1,449.21 km) |
| Willstatt to Targovishte | 966.97 mi (1,556.19 km) |
| Willstatt to Teteven | 877.60 mi (1,412.36 km) |
| Willstatt to Troyan | 898.18 mi (1,445.48 km) |
| Willstatt to Tryavna | 932.67 mi (1,500.98 km) |
| Willstatt to Tutrakan | 943.14 mi (1,517.84 km) |
| Willstatt to Varna | 1,027.16 mi (1,653.05 km) |
