| Santander to Popovo | 1,499.57 mi (2,413.32 km) |
| Santander to Provadia | 1,561.03 mi (2,512.23 km) |
| Santander to Radnevo | 1,499.76 mi (2,413.62 km) |
| Santander to Radomir | 1,347.48 mi (2,168.57 km) |
| Santander to Rakitovo | 1,412.63 mi (2,273.41 km) |
| Santander to Rakovski | 1,451.77 mi (2,336.39 km) |
| Santander to Razgrad | 1,511.22 mi (2,432.08 km) |
| Santander to Razlog | 1,383.47 mi (2,226.49 km) |
| Santander to Ruse | 1,480.07 mi (2,381.94 km) |
| Santander to Samokov | 1,380.76 mi (2,222.12 km) |
| Santander to Sandanski | 1,379.58 mi (2,220.22 km) |
| Santander to Sevlievo | 1,448.43 mi (2,331.02 km) |
| Santander to Shumen | 1,534.99 mi (2,470.33 km) |
| Santander to Silistra | 1,540.88 mi (2,479.81 km) |
| Santander to Sliven | 1,513.75 mi (2,436.15 km) |
