| Cities | Distance |
|---|---|
| Birsfelden to Popovo | 944.91 mi (1,520.68 km) |
| Birsfelden to Provadia | 1,004.66 mi (1,616.84 km) |
| Birsfelden to Radnevo | 963.52 mi (1,550.64 km) |
| Birsfelden to Radomir | 822.25 mi (1,323.29 km) |
| Birsfelden to Rakitovo | 892.06 mi (1,435.64 km) |
| Birsfelden to Rakovski | 920.56 mi (1,481.49 km) |
| Birsfelden to Razgrad | 952.76 mi (1,533.32 km) |
| Birsfelden to Razlog | 868.71 mi (1,398.06 km) |
| Birsfelden to Ruse | 919.03 mi (1,479.04 km) |
| Birsfelden to Samokov | 856.33 mi (1,378.13 km) |
| Birsfelden to Sandanski | 872.55 mi (1,404.23 km) |
| Birsfelden to Sevlievo | 903.48 mi (1,454.02 km) |
| Birsfelden to Shumen | 978.87 mi (1,575.35 km) |
| Birsfelden to Silistra | 971.78 mi (1,563.93 km) |
| Birsfelden to Sliven | 969.34 mi (1,560.00 km) |