| Trets to Popovo | 1,028.94 mi (1,655.91 km) |
| Trets to Provadia | 1,090.32 mi (1,754.71 km) |
| Trets to Radnevo | 1,025.76 mi (1,650.81 km) |
| Trets to Radomir | 873.04 mi (1,405.02 km) |
| Trets to Rakitovo | 937.48 mi (1,508.73 km) |
| Trets to Rakovski | 977.41 mi (1,572.99 km) |
| Trets to Razgrad | 1,041.46 mi (1,676.07 km) |
| Trets to Razlog | 908.06 mi (1,461.38 km) |
| Trets to Ruse | 1,011.33 mi (1,627.58 km) |
| Trets to Samokov | 906.06 mi (1,458.16 km) |
| Trets to Sandanski | 903.89 mi (1,454.67 km) |
| Trets to Sevlievo | 976.14 mi (1,570.94 km) |
| Trets to Shumen | 1,064.43 mi (1,713.03 km) |
| Trets to Silistra | 1,074.14 mi (1,728.67 km) |
| Trets to Sliven | 1,040.91 mi (1,675.18 km) |
