| Seia to Popovo | 1,745.13 mi (2,808.52 km) |
| Seia to Provadia | 1,806.34 mi (2,907.02 km) |
| Seia to Radnevo | 1,737.76 mi (2,796.66 km) |
| Seia to Radomir | 1,584.64 mi (2,550.24 km) |
| Seia to Rakitovo | 1,646.40 mi (2,649.62 km) |
| Seia to Rakovski | 1,688.76 mi (2,717.80 km) |
| Seia to Razgrad | 1,758.19 mi (2,829.54 km) |
| Seia to Razlog | 1,615.78 mi (2,600.34 km) |
| Seia to Ruse | 1,728.62 mi (2,781.94 km) |
| Seia to Samokov | 1,616.78 mi (2,601.96 km) |
| Seia to Sandanski | 1,609.09 mi (2,589.58 km) |
| Seia to Sevlievo | 1,690.94 mi (2,721.31 km) |
| Seia to Shumen | 1,780.60 mi (2,865.59 km) |
| Seia to Silistra | 1,792.01 mi (2,883.97 km) |
| Seia to Sliven | 1,754.83 mi (2,824.13 km) |
