| Castelo Branco to Popovo | 1,748.28 mi (2,813.59 km) |
| Castelo Branco to Provadia | 1,809.33 mi (2,911.84 km) |
| Castelo Branco to Radnevo | 1,739.03 mi (2,798.70 km) |
| Castelo Branco to Radomir | 1,585.99 mi (2,552.41 km) |
| Castelo Branco to Rakitovo | 1,646.82 mi (2,650.30 km) |
| Castelo Branco to Rakovski | 1,689.87 mi (2,719.58 km) |
| Castelo Branco to Razgrad | 1,761.69 mi (2,835.17 km) |
| Castelo Branco to Razlog | 1,615.92 mi (2,600.57 km) |
| Castelo Branco to Ruse | 1,732.58 mi (2,788.31 km) |
| Castelo Branco to Samokov | 1,617.80 mi (2,603.59 km) |
| Castelo Branco to Sandanski | 1,608.61 mi (2,588.80 km) |
| Castelo Branco to Sevlievo | 1,693.41 mi (2,725.27 km) |
| Castelo Branco to Shumen | 1,783.70 mi (2,870.59 km) |
| Castelo Branco to Silistra | 1,796.58 mi (2,891.31 km) |
| Castelo Branco to Sliven | 1,756.83 mi (2,827.35 km) |
