| Donostia to Bicaz | 1,383.27 mi (2,226.16 km) |
| Donostia to Bistrita | 1,308.59 mi (2,105.97 km) |
| Donostia to Blaj | 1,280.03 mi (2,060.01 km) |
| Donostia to Bocsa | 1,174.81 mi (1,890.67 km) |
| Donostia to Boldesti-Scaeni | 1,386.09 mi (2,230.70 km) |
| Donostia to Bolintin Vale | 1,376.85 mi (2,215.83 km) |
| Donostia to Borsa | 1,317.82 mi (2,120.82 km) |
| Donostia to Botosani | 1,411.30 mi (2,271.27 km) |
| Donostia to Brad | 1,226.22 mi (1,973.42 km) |
| Donostia to Bragadiru | 1,388.15 mi (2,234.00 km) |
| Donostia to Braila | 1,478.09 mi (2,378.75 km) |
| Donostia to Brasov | 1,362.93 mi (2,193.42 km) |
| Donostia to Breaza | 1,367.31 mi (2,200.48 km) |
| Donostia to Bucharest | 1,393.96 mi (2,243.36 km) |
| Donostia to Buftea | 1,385.34 mi (2,229.49 km) |
