| Trets to Smolyan | 974.72 mi (1,568.66 km) |
| Trets to Sofia | 890.35 mi (1,432.88 km) |
| Trets to Sopot | 962.05 mi (1,548.28 km) |
| Trets to Sozopol | 1,112.67 mi (1,790.67 km) |
| Trets to Sredets | 1,088.54 mi (1,751.84 km) |
| Trets to Stamboliyski | 957.88 mi (1,541.56 km) |
| Trets to Stara Zagora | 1,009.81 mi (1,625.13 km) |
| Trets to Svilengrad | 1,046.98 mi (1,684.95 km) |
| Trets to Svishtov | 982.78 mi (1,581.64 km) |
| Trets to Targovishte | 1,047.30 mi (1,685.47 km) |
| Trets to Teteven | 934.92 mi (1,504.60 km) |
| Trets to Troyan | 957.78 mi (1,541.40 km) |
| Trets to Tryavna | 997.13 mi (1,604.73 km) |
| Trets to Tutrakan | 1,042.72 mi (1,678.09 km) |
| Trets to Varna | 1,114.07 mi (1,792.92 km) |
