| Biarritz to Popovo | 1,388.41 mi (2,234.44 km) |
| Biarritz to Provadia | 1,449.88 mi (2,333.35 km) |
| Biarritz to Radnevo | 1,387.82 mi (2,233.48 km) |
| Biarritz to Radomir | 1,235.42 mi (1,988.21 km) |
| Biarritz to Rakitovo | 1,300.38 mi (2,092.76 km) |
| Biarritz to Rakovski | 1,339.73 mi (2,156.09 km) |
| Biarritz to Razgrad | 1,400.26 mi (2,253.51 km) |
| Biarritz to Razlog | 1,271.14 mi (2,045.70 km) |
| Biarritz to Ruse | 1,369.32 mi (2,203.71 km) |
| Biarritz to Samokov | 1,268.63 mi (2,041.67 km) |
| Biarritz to Sandanski | 1,267.13 mi (2,039.25 km) |
| Biarritz to Sevlievo | 1,336.89 mi (2,151.52 km) |
| Biarritz to Shumen | 1,423.86 mi (2,291.49 km) |
| Biarritz to Silistra | 1,430.59 mi (2,302.31 km) |
| Biarritz to Sliven | 1,402.10 mi (2,256.46 km) |
