| London Colney to Smolyan | 1,367.09 mi (2,200.12 km) |
| London Colney to Sofia | 1,264.12 mi (2,034.41 km) |
| London Colney to Sopot | 1,323.58 mi (2,130.09 km) |
| London Colney to Sozopol | 1,454.03 mi (2,340.04 km) |
| London Colney to Sredets | 1,436.13 mi (2,311.23 km) |
| London Colney to Stamboliyski | 1,336.60 mi (2,151.04 km) |
| London Colney to Stara Zagora | 1,369.20 mi (2,203.51 km) |
| London Colney to Svilengrad | 1,419.60 mi (2,284.62 km) |
| London Colney to Svishtov | 1,309.24 mi (2,107.01 km) |
| London Colney to Targovishte | 1,374.59 mi (2,212.19 km) |
| London Colney to Teteven | 1,292.91 mi (2,080.74 km) |
| London Colney to Troyan | 1,312.59 mi (2,112.41 km) |
| London Colney to Tryavna | 1,345.26 mi (2,164.99 km) |
| London Colney to Tutrakan | 1,345.33 mi (2,165.11 km) |
| London Colney to Varna | 1,431.31 mi (2,303.46 km) |
