| Sint Willebrord to Smolyan | 1,171.18 mi (1,884.83 km) |
| Sint Willebrord to Sofia | 1,067.37 mi (1,717.77 km) |
| Sint Willebrord to Sopot | 1,124.27 mi (1,809.34 km) |
| Sint Willebrord to Sozopol | 1,250.95 mi (2,013.21 km) |
| Sint Willebrord to Sredets | 1,233.85 mi (1,985.70 km) |
| Sint Willebrord to Stamboliyski | 1,139.28 mi (1,833.50 km) |
| Sint Willebrord to Stara Zagora | 1,169.00 mi (1,881.33 km) |
| Sint Willebrord to Svilengrad | 1,220.33 mi (1,963.94 km) |
| Sint Willebrord to Svishtov | 1,106.31 mi (1,780.44 km) |
| Sint Willebrord to Targovishte | 1,170.99 mi (1,884.53 km) |
| Sint Willebrord to Teteven | 1,093.66 mi (1,760.07 km) |
| Sint Willebrord to Troyan | 1,112.65 mi (1,790.64 km) |
| Sint Willebrord to Tryavna | 1,144.11 mi (1,841.27 km) |
| Sint Willebrord to Tutrakan | 1,139.93 mi (1,834.54 km) |
| Sint Willebrord to Varna | 1,226.28 mi (1,973.51 km) |
