| Portugalete to Popovo | 1,462.50 mi (2,353.66 km) |
| Portugalete to Provadia | 1,523.96 mi (2,452.58 km) |
| Portugalete to Radnevo | 1,461.88 mi (2,352.67 km) |
| Portugalete to Radomir | 1,309.45 mi (2,107.35 km) |
| Portugalete to Rakitovo | 1,374.32 mi (2,211.76 km) |
| Portugalete to Rakovski | 1,413.77 mi (2,275.24 km) |
| Portugalete to Razgrad | 1,474.33 mi (2,372.70 km) |
| Portugalete to Razlog | 1,345.02 mi (2,164.61 km) |
| Portugalete to Ruse | 1,443.36 mi (2,322.86 km) |
| Portugalete to Samokov | 1,342.64 mi (2,160.77 km) |
| Portugalete to Sandanski | 1,340.91 mi (2,157.98 km) |
| Portugalete to Sevlievo | 1,410.99 mi (2,270.77 km) |
| Portugalete to Shumen | 1,497.95 mi (2,410.71 km) |
| Portugalete to Silistra | 1,504.54 mi (2,421.32 km) |
| Portugalete to Sliven | 1,476.19 mi (2,375.71 km) |
