| Alton to Popovo | 1,375.18 mi (2,213.14 km) |
| Alton to Provadia | 1,432.27 mi (2,305.01 km) |
| Alton to Radnevo | 1,402.97 mi (2,257.86 km) |
| Alton to Radomir | 1,269.20 mi (2,042.58 km) |
| Alton to Rakitovo | 1,339.07 mi (2,155.03 km) |
| Alton to Rakovski | 1,363.09 mi (2,193.69 km) |
| Alton to Razgrad | 1,380.42 mi (2,221.58 km) |
| Alton to Razlog | 1,317.97 mi (2,121.06 km) |
| Alton to Ruse | 1,345.97 mi (2,166.13 km) |
| Alton to Samokov | 1,302.79 mi (2,096.65 km) |
| Alton to Sandanski | 1,323.81 mi (2,130.47 km) |
| Alton to Sevlievo | 1,340.25 mi (2,156.92 km) |
| Alton to Shumen | 1,407.33 mi (2,264.87 km) |
| Alton to Silistra | 1,391.20 mi (2,238.92 km) |
| Alton to Sliven | 1,404.71 mi (2,260.67 km) |
