| Darby to Smolyan | 4,900.92 mi (7,887.27 km) |
| Darby to Sofia | 4,798.63 mi (7,722.65 km) |
| Darby to Sopot | 4,858.81 mi (7,819.50 km) |
| Darby to Sozopol | 4,987.82 mi (8,027.11 km) |
| Darby to Sredets | 4,970.60 mi (7,999.40 km) |
| Darby to Stamboliyski | 4,871.27 mi (7,839.56 km) |
| Darby to Stara Zagora | 4,904.43 mi (7,892.92 km) |
| Darby to Svilengrad | 4,954.82 mi (7,974.01 km) |
| Darby to Svishtov | 4,843.17 mi (7,794.32 km) |
| Darby to Targovishte | 4,907.81 mi (7,898.35 km) |
| Darby to Teteven | 4,828.15 mi (7,770.16 km) |
| Darby to Troyan | 4,847.84 mi (7,801.84 km) |
| Darby to Tryavna | 4,880.28 mi (7,854.05 km) |
| Darby to Tutrakan | 4,875.59 mi (7,846.50 km) |
| Darby to Varna | 4,962.23 mi (7,985.95 km) |
