| Bonham to Smolyan | 6,031.17 mi (9,706.23 km) |
| Bonham to Sofia | 5,927.10 mi (9,538.75 km) |
| Bonham to Sopot | 5,981.53 mi (9,626.34 km) |
| Bonham to Sozopol | 6,098.70 mi (9,814.91 km) |
| Bonham to Sredets | 6,084.31 mi (9,791.76 km) |
| Bonham to Stamboliyski | 5,998.51 mi (9,653.67 km) |
| Bonham to Stara Zagora | 6,024.67 mi (9,695.77 km) |
| Bonham to Svilengrad | 6,077.19 mi (9,780.29 km) |
| Bonham to Svishtov | 5,956.33 mi (9,585.79 km) |
| Bonham to Targovishte | 6,017.98 mi (9,685.00 km) |
| Bonham to Teteven | 5,951.11 mi (9,577.38 km) |
| Bonham to Troyan | 5,969.07 mi (9,606.29 km) |
| Bonham to Tryavna | 5,998.14 mi (9,653.08 km) |
| Bonham to Tutrakan | 5,979.75 mi (9,623.48 km) |
| Bonham to Varna | 6,066.34 mi (9,762.83 km) |
