| Difficult Run to Smolyan | 5,031.67 mi (8,097.69 km) |
| Difficult Run to Sofia | 4,929.29 mi (7,932.92 km) |
| Difficult Run to Sopot | 4,989.28 mi (8,029.47 km) |
| Difficult Run to Sozopol | 5,117.87 mi (8,236.42 km) |
| Difficult Run to Sredets | 5,100.76 mi (8,208.88 km) |
| Difficult Run to Stamboliyski | 5,001.91 mi (8,049.80 km) |
| Difficult Run to Stara Zagora | 5,034.82 mi (8,102.77 km) |
| Difficult Run to Svilengrad | 5,085.30 mi (8,184.00 km) |
| Difficult Run to Svishtov | 4,973.26 mi (8,003.69 km) |
| Difficult Run to Targovishte | 5,037.80 mi (8,107.56 km) |
| Difficult Run to Teteven | 4,958.62 mi (7,980.13 km) |
| Difficult Run to Troyan | 4,978.25 mi (8,011.72 km) |
| Difficult Run to Tryavna | 5,010.57 mi (8,063.74 km) |
| Difficult Run to Tutrakan | 5,005.32 mi (8,055.28 km) |
| Difficult Run to Varna | 5,092.00 mi (8,194.78 km) |
