| Duncanville to Popovo | 6,077.76 mi (9,781.21 km) |
| Duncanville to Provadia | 6,128.27 mi (9,862.50 km) |
| Duncanville to Radnevo | 6,118.36 mi (9,846.55 km) |
| Duncanville to Radomir | 5,996.88 mi (9,651.04 km) |
| Duncanville to Rakitovo | 6,065.89 mi (9,762.10 km) |
| Duncanville to Rakovski | 6,083.73 mi (9,790.81 km) |
| Duncanville to Razgrad | 6,078.78 mi (9,782.86 km) |
| Duncanville to Razlog | 6,047.68 mi (9,732.80 km) |
| Duncanville to Ruse | 6,044.75 mi (9,728.09 km) |
| Duncanville to Samokov | 6,029.45 mi (9,703.46 km) |
| Duncanville to Sandanski | 6,055.70 mi (9,745.70 km) |
| Duncanville to Sevlievo | 6,053.48 mi (9,742.14 km) |
| Duncanville to Shumen | 6,105.76 mi (9,826.27 km) |
| Duncanville to Silistra | 6,075.94 mi (9,778.28 km) |
| Duncanville to Sliven | 6,113.99 mi (9,839.52 km) |
