| Merthyr Tudful to Bicaz | 1,358.21 mi (2,185.83 km) |
| Merthyr Tudful to Bistrita | 1,283.76 mi (2,066.01 km) |
| Merthyr Tudful to Blaj | 1,287.82 mi (2,072.55 km) |
| Merthyr Tudful to Bocsa | 1,221.25 mi (1,965.41 km) |
| Merthyr Tudful to Boldesti-Scaeni | 1,415.46 mi (2,277.96 km) |
| Merthyr Tudful to Bolintin Vale | 1,424.28 mi (2,292.16 km) |
| Merthyr Tudful to Borsa | 1,276.08 mi (2,053.66 km) |
| Merthyr Tudful to Botosani | 1,359.38 mi (2,187.71 km) |
| Merthyr Tudful to Brad | 1,241.56 mi (1,998.10 km) |
| Merthyr Tudful to Bragadiru | 1,436.21 mi (2,311.36 km) |
| Merthyr Tudful to Braila | 1,489.36 mi (2,396.89 km) |
| Merthyr Tudful to Brasov | 1,376.59 mi (2,215.40 km) |
| Merthyr Tudful to Breaza | 1,394.50 mi (2,244.23 km) |
| Merthyr Tudful to Bucharest | 1,439.46 mi (2,316.58 km) |
| Merthyr Tudful to Buftea | 1,428.07 mi (2,298.25 km) |
