| Wallingford Center to Smolyan | 4,735.07 mi (7,620.36 km) |
| Wallingford Center to Sofia | 4,632.76 mi (7,455.70 km) |
| Wallingford Center to Sopot | 4,692.91 mi (7,552.51 km) |
| Wallingford Center to Sozopol | 4,821.91 mi (7,760.12 km) |
| Wallingford Center to Sredets | 4,804.69 mi (7,732.40 km) |
| Wallingford Center to Stamboliyski | 4,705.40 mi (7,572.61 km) |
| Wallingford Center to Stara Zagora | 4,738.53 mi (7,625.92 km) |
| Wallingford Center to Svilengrad | 4,788.92 mi (7,707.02 km) |
| Wallingford Center to Svishtov | 4,677.26 mi (7,527.33 km) |
| Wallingford Center to Targovishte | 4,741.91 mi (7,631.37 km) |
| Wallingford Center to Teteven | 4,662.25 mi (7,503.17 km) |
| Wallingford Center to Troyan | 4,681.93 mi (7,534.85 km) |
| Wallingford Center to Tryavna | 4,714.37 mi (7,587.05 km) |
| Wallingford Center to Tutrakan | 4,709.73 mi (7,579.58 km) |
| Wallingford Center to Varna | 4,796.37 mi (7,719.01 km) |
