| Towcester to Smolyan | 1,404.54 mi (2,260.39 km) |
| Towcester to Sofia | 1,301.38 mi (2,094.36 km) |
| Towcester to Sopot | 1,360.30 mi (2,189.19 km) |
| Towcester to Sozopol | 1,489.74 mi (2,397.50 km) |
| Towcester to Sredets | 1,472.09 mi (2,369.09 km) |
| Towcester to Stamboliyski | 1,373.76 mi (2,210.85 km) |
| Towcester to Stara Zagora | 1,405.71 mi (2,262.28 km) |
| Towcester to Svilengrad | 1,456.36 mi (2,343.78 km) |
| Towcester to Svishtov | 1,344.96 mi (2,164.51 km) |
| Towcester to Targovishte | 1,410.11 mi (2,269.35 km) |
| Towcester to Teteven | 1,329.64 mi (2,139.85 km) |
| Towcester to Troyan | 1,349.16 mi (2,171.26 km) |
| Towcester to Tryavna | 1,381.52 mi (2,223.34 km) |
| Towcester to Tutrakan | 1,380.15 mi (2,221.14 km) |
| Towcester to Varna | 1,466.30 mi (2,359.77 km) |
