| Donostia to Popovo | 1,411.04 mi (2,270.86 km) |
| Donostia to Provadia | 1,472.50 mi (2,369.76 km) |
| Donostia to Radnevo | 1,410.02 mi (2,269.21 km) |
| Donostia to Radomir | 1,257.52 mi (2,023.78 km) |
| Donostia to Rakitovo | 1,322.29 mi (2,128.02 km) |
| Donostia to Rakovski | 1,361.86 mi (2,191.70 km) |
| Donostia to Razgrad | 1,422.97 mi (2,290.05 km) |
| Donostia to Razlog | 1,292.94 mi (2,080.79 km) |
| Donostia to Ruse | 1,392.11 mi (2,240.38 km) |
| Donostia to Samokov | 1,290.68 mi (2,077.14 km) |
| Donostia to Sandanski | 1,288.76 mi (2,074.06 km) |
| Donostia to Sevlievo | 1,359.34 mi (2,187.65 km) |
| Donostia to Shumen | 1,446.50 mi (2,327.92 km) |
| Donostia to Silistra | 1,453.52 mi (2,339.21 km) |
| Donostia to Sliven | 1,424.48 mi (2,292.48 km) |
