| Darwen to Smolyan | 1,501.85 mi (2,417.00 km) |
| Darwen to Sofia | 1,397.98 mi (2,249.84 km) |
| Darwen to Sopot | 1,454.33 mi (2,340.52 km) |
| Darwen to Sozopol | 1,578.98 mi (2,541.12 km) |
| Darwen to Sredets | 1,562.46 mi (2,514.53 km) |
| Darwen to Stamboliyski | 1,469.79 mi (2,365.40 km) |
| Darwen to Stara Zagora | 1,498.72 mi (2,411.95 km) |
| Darwen to Svilengrad | 1,550.34 mi (2,495.04 km) |
| Darwen to Svishtov | 1,434.63 mi (2,308.81 km) |
| Darwen to Targovishte | 1,498.70 mi (2,411.92 km) |
| Darwen to Teteven | 1,423.74 mi (2,291.29 km) |
| Darwen to Troyan | 1,442.50 mi (2,321.49 km) |
| Darwen to Tryavna | 1,473.43 mi (2,371.25 km) |
| Darwen to Tutrakan | 1,465.87 mi (2,359.09 km) |
| Darwen to Varna | 1,552.53 mi (2,498.56 km) |
