| Middlesex to Smolyan | 4,841.45 mi (7,791.56 km) |
| Middlesex to Sofia | 4,739.11 mi (7,626.85 km) |
| Middlesex to Sopot | 4,799.18 mi (7,723.54 km) |
| Middlesex to Sozopol | 4,928.00 mi (7,930.85 km) |
| Middlesex to Sredets | 4,910.83 mi (7,903.21 km) |
| Middlesex to Stamboliyski | 4,811.74 mi (7,743.74 km) |
| Middlesex to Stara Zagora | 4,844.76 mi (7,796.89 km) |
| Middlesex to Svilengrad | 4,895.20 mi (7,878.06 km) |
| Middlesex to Svishtov | 4,783.37 mi (7,698.09 km) |
| Middlesex to Targovishte | 4,847.97 mi (7,802.05 km) |
| Middlesex to Teteven | 4,768.52 mi (7,674.19 km) |
| Middlesex to Troyan | 4,788.18 mi (7,705.83 km) |
| Middlesex to Tryavna | 4,820.57 mi (7,757.95 km) |
| Middlesex to Tutrakan | 4,815.66 mi (7,750.06 km) |
| Middlesex to Varna | 4,902.32 mi (7,889.52 km) |
