| Tonawanda to Smolyan | 4,910.91 mi (7,903.34 km) |
| Tonawanda to Sofia | 4,807.36 mi (7,736.70 km) |
| Tonawanda to Sopot | 4,864.33 mi (7,828.38 km) |
| Tonawanda to Sozopol | 4,987.01 mi (8,025.82 km) |
| Tonawanda to Sredets | 4,971.30 mi (8,000.54 km) |
| Tonawanda to Stamboliyski | 4,879.43 mi (7,852.69 km) |
| Tonawanda to Stara Zagora | 4,908.63 mi (7,899.68 km) |
| Tonawanda to Svilengrad | 4,960.34 mi (7,982.90 km) |
| Tonawanda to Svishtov | 4,843.27 mi (7,794.49 km) |
| Tonawanda to Targovishte | 4,906.42 mi (7,896.13 km) |
| Tonawanda to Teteven | 4,833.74 mi (7,779.15 km) |
| Tonawanda to Troyan | 4,852.48 mi (7,809.31 km) |
| Tonawanda to Tryavna | 4,883.09 mi (7,858.57 km) |
| Tonawanda to Tutrakan | 4,870.89 mi (7,838.93 km) |
| Tonawanda to Varna | 4,957.72 mi (7,978.68 km) |
