| Sidcup to Smolyan | 1,343.58 mi (2,162.28 km) |
| Sidcup to Sofia | 1,240.78 mi (1,996.85 km) |
| Sidcup to Sopot | 1,300.69 mi (2,093.25 km) |
| Sidcup to Sozopol | 1,431.97 mi (2,304.54 km) |
| Sidcup to Sredets | 1,413.87 mi (2,275.40 km) |
| Sidcup to Stamboliyski | 1,313.33 mi (2,113.60 km) |
| Sidcup to Stara Zagora | 1,346.48 mi (2,166.94 km) |
| Sidcup to Svilengrad | 1,396.67 mi (2,247.72 km) |
| Sidcup to Svishtov | 1,287.18 mi (2,071.52 km) |
| Sidcup to Targovishte | 1,352.70 mi (2,176.97 km) |
| Sidcup to Teteven | 1,270.03 mi (2,043.91 km) |
| Sidcup to Troyan | 1,289.84 mi (2,075.79 km) |
| Sidcup to Tryavna | 1,322.76 mi (2,128.77 km) |
| Sidcup to Tutrakan | 1,324.02 mi (2,130.80 km) |
| Sidcup to Varna | 1,409.84 mi (2,268.91 km) |
