| Harlow to Smolyan | 1,351.37 mi (2,174.82 km) |
| Harlow to Sofia | 1,248.27 mi (2,008.90 km) |
| Harlow to Sopot | 1,307.42 mi (2,104.08 km) |
| Harlow to Sozopol | 1,437.37 mi (2,313.22 km) |
| Harlow to Sredets | 1,419.58 mi (2,284.59 km) |
| Harlow to Stamboliyski | 1,320.69 mi (2,125.45 km) |
| Harlow to Stara Zagora | 1,352.93 mi (2,177.32 km) |
| Harlow to Svilengrad | 1,403.46 mi (2,258.65 km) |
| Harlow to Svishtov | 1,292.58 mi (2,080.21 km) |
| Harlow to Targovishte | 1,357.84 mi (2,185.24 km) |
| Harlow to Teteven | 1,276.75 mi (2,054.74 km) |
| Harlow to Troyan | 1,296.35 mi (2,086.27 km) |
| Harlow to Tryavna | 1,328.86 mi (2,138.59 km) |
| Harlow to Tutrakan | 1,328.30 mi (2,137.70 km) |
| Harlow to Varna | 1,414.34 mi (2,276.17 km) |
