| Wallingford to Smolyan | 1,397.24 mi (2,248.63 km) |
| Wallingford to Sofia | 1,294.54 mi (2,083.35 km) |
| Wallingford to Sopot | 1,354.61 mi (2,180.03 km) |
| Wallingford to Sozopol | 1,486.06 mi (2,391.58 km) |
| Wallingford to Sredets | 1,467.93 mi (2,362.41 km) |
| Wallingford to Stamboliyski | 1,367.11 mi (2,200.15 km) |
| Wallingford to Stara Zagora | 1,400.44 mi (2,253.80 km) |
| Wallingford to Svilengrad | 1,450.57 mi (2,334.47 km) |
| Wallingford to Svishtov | 1,341.27 mi (2,158.57 km) |
| Wallingford to Targovishte | 1,406.80 mi (2,264.03 km) |
| Wallingford to Teteven | 1,323.95 mi (2,130.69 km) |
| Wallingford to Troyan | 1,343.80 mi (2,162.63 km) |
| Wallingford to Tryavna | 1,376.78 mi (2,215.71 km) |
| Wallingford to Tutrakan | 1,378.12 mi (2,217.87 km) |
| Wallingford to Varna | 1,463.94 mi (2,355.99 km) |
