| Box Elder to Popovo | 5,634.25 mi (9,067.46 km) |
| Box Elder to Provadia | 5,677.41 mi (9,136.91 km) |
| Box Elder to Radnevo | 5,685.70 mi (9,150.25 km) |
| Box Elder to Radomir | 5,583.99 mi (8,986.57 km) |
| Box Elder to Rakitovo | 5,649.59 mi (9,092.14 km) |
| Box Elder to Rakovski | 5,658.31 mi (9,106.18 km) |
| Box Elder to Razgrad | 5,631.73 mi (9,063.40 km) |
| Box Elder to Razlog | 5,636.82 mi (9,071.58 km) |
| Box Elder to Ruse | 5,599.37 mi (9,011.31 km) |
| Box Elder to Samokov | 5,613.99 mi (9,034.85 km) |
| Box Elder to Sandanski | 5,648.95 mi (9,091.11 km) |
| Box Elder to Sevlievo | 5,620.78 mi (9,045.78 km) |
| Box Elder to Shumen | 5,657.73 mi (9,105.24 km) |
| Box Elder to Silistra | 5,618.85 mi (9,042.66 km) |
| Box Elder to Sliven | 5,675.23 mi (9,133.40 km) |
