| Harrow Weald to Smolyan | 1,365.67 mi (2,197.83 km) |
| Harrow Weald to Sofia | 1,262.81 mi (2,032.29 km) |
| Harrow Weald to Sopot | 1,322.53 mi (2,128.41 km) |
| Harrow Weald to Sozopol | 1,453.47 mi (2,339.13 km) |
| Harrow Weald to Sredets | 1,435.45 mi (2,310.14 km) |
| Harrow Weald to Stamboliyski | 1,335.32 mi (2,149.00 km) |
| Harrow Weald to Stara Zagora | 1,368.25 mi (2,201.99 km) |
| Harrow Weald to Svilengrad | 1,418.53 mi (2,282.91 km) |
| Harrow Weald to Svishtov | 1,308.67 mi (2,106.10 km) |
| Harrow Weald to Targovishte | 1,374.12 mi (2,211.43 km) |
| Harrow Weald to Teteven | 1,291.87 mi (2,079.07 km) |
| Harrow Weald to Troyan | 1,311.63 mi (2,110.86 km) |
| Harrow Weald to Tryavna | 1,344.44 mi (2,163.67 km) |
| Harrow Weald to Tutrakan | 1,345.16 mi (2,164.83 km) |
| Harrow Weald to Varna | 1,431.05 mi (2,303.06 km) |
