| Thorne to Popovo | 1,420.23 mi (2,285.64 km) |
| Thorne to Provadia | 1,474.24 mi (2,372.56 km) |
| Thorne to Radnevo | 1,455.89 mi (2,343.03 km) |
| Thorne to Radomir | 1,331.96 mi (2,143.59 km) |
| Thorne to Rakitovo | 1,400.97 mi (2,254.64 km) |
| Thorne to Rakovski | 1,419.69 mi (2,284.77 km) |
| Thorne to Razgrad | 1,423.25 mi (2,290.49 km) |
| Thorne to Razlog | 1,382.91 mi (2,225.59 km) |
| Thorne to Ruse | 1,388.78 mi (2,235.03 km) |
| Thorne to Samokov | 1,364.53 mi (2,195.99 km) |
| Thorne to Sandanski | 1,391.43 mi (2,239.29 km) |
| Thorne to Sevlievo | 1,391.51 mi (2,239.42 km) |
| Thorne to Shumen | 1,450.37 mi (2,334.14 km) |
| Thorne to Silistra | 1,427.51 mi (2,297.35 km) |
| Thorne to Sliven | 1,453.76 mi (2,339.60 km) |
