| Romford to Smolyan | 1,344.18 mi (2,163.25 km) |
| Romford to Sofia | 1,241.24 mi (1,997.58 km) |
| Romford to Sopot | 1,300.79 mi (2,093.42 km) |
| Romford to Sozopol | 1,431.46 mi (2,303.72 km) |
| Romford to Sredets | 1,413.50 mi (2,274.81 km) |
| Romford to Stamboliyski | 1,313.73 mi (2,114.24 km) |
| Romford to Stara Zagora | 1,346.45 mi (2,166.90 km) |
| Romford to Svilengrad | 1,396.80 mi (2,247.94 km) |
| Romford to Svishtov | 1,286.67 mi (2,070.69 km) |
| Romford to Targovishte | 1,352.07 mi (2,175.95 km) |
| Romford to Teteven | 1,270.13 mi (2,044.07 km) |
| Romford to Troyan | 1,289.83 mi (2,075.79 km) |
| Romford to Tryavna | 1,322.57 mi (2,128.46 km) |
| Romford to Tutrakan | 1,323.00 mi (2,129.16 km) |
| Romford to Varna | 1,408.92 mi (2,267.43 km) |
