| Birchington to Popovo | 1,283.31 mi (2,065.29 km) |
| Birchington to Provadia | 1,339.71 mi (2,156.06 km) |
| Birchington to Radnevo | 1,313.25 mi (2,113.48 km) |
| Birchington to Radomir | 1,182.32 mi (1,902.76 km) |
| Birchington to Rakitovo | 1,252.02 mi (2,014.93 km) |
| Birchington to Rakovski | 1,274.40 mi (2,050.95 km) |
| Birchington to Razgrad | 1,288.01 mi (2,072.85 km) |
| Birchington to Razlog | 1,231.90 mi (1,982.55 km) |
| Birchington to Ruse | 1,253.51 mi (2,017.32 km) |
| Birchington to Samokov | 1,215.63 mi (1,956.36 km) |
| Birchington to Sandanski | 1,238.69 mi (1,993.47 km) |
| Birchington to Sevlievo | 1,249.97 mi (2,011.64 km) |
| Birchington to Shumen | 1,315.00 mi (2,116.29 km) |
| Birchington to Silistra | 1,297.31 mi (2,087.82 km) |
| Birchington to Sliven | 1,313.92 mi (2,114.56 km) |
