| Thornton to Popovo | 1,458.81 mi (2,347.73 km) |
| Thornton to Provadia | 1,512.81 mi (2,434.63 km) |
| Thornton to Radnevo | 1,494.45 mi (2,405.08 km) |
| Thornton to Radomir | 1,370.35 mi (2,205.36 km) |
| Thornton to Rakitovo | 1,439.38 mi (2,316.46 km) |
| Thornton to Rakovski | 1,458.20 mi (2,346.75 km) |
| Thornton to Razgrad | 1,461.82 mi (2,352.58 km) |
| Thornton to Razlog | 1,421.25 mi (2,287.28 km) |
| Thornton to Ruse | 1,427.36 mi (2,297.11 km) |
| Thornton to Samokov | 1,402.94 mi (2,257.82 km) |
| Thornton to Sandanski | 1,429.69 mi (2,300.87 km) |
| Thornton to Sevlievo | 1,430.08 mi (2,301.49 km) |
| Thornton to Shumen | 1,488.94 mi (2,396.22 km) |
| Thornton to Silistra | 1,466.02 mi (2,359.34 km) |
| Thornton to Sliven | 1,492.34 mi (2,401.69 km) |
