| Walton upon Thames to Smolyan | 1,363.47 mi (2,194.29 km) |
| Walton upon Thames to Sofia | 1,260.82 mi (2,029.10 km) |
| Walton upon Thames to Sopot | 1,321.03 mi (2,126.00 km) |
| Walton upon Thames to Sozopol | 1,452.81 mi (2,338.06 km) |
| Walton upon Thames to Sredets | 1,434.59 mi (2,308.75 km) |
| Walton upon Thames to Stamboliyski | 1,333.41 mi (2,145.92 km) |
| Walton upon Thames to Stara Zagora | 1,366.93 mi (2,199.86 km) |
| Walton upon Thames to Svilengrad | 1,416.98 mi (2,280.41 km) |
| Walton upon Thames to Svishtov | 1,308.03 mi (2,105.06 km) |
| Walton upon Thames to Targovishte | 1,373.63 mi (2,210.64 km) |
| Walton upon Thames to Teteven | 1,290.38 mi (2,076.66 km) |
| Walton upon Thames to Troyan | 1,310.27 mi (2,108.68 km) |
| Walton upon Thames to Tryavna | 1,343.34 mi (2,161.90 km) |
| Walton upon Thames to Tutrakan | 1,345.21 mi (2,164.91 km) |
| Walton upon Thames to Varna | 1,430.96 mi (2,302.90 km) |
