| Boo to Popovo | 1,153.82 mi (1,856.89 km) |
| Boo to Provadia | 1,180.75 mi (1,900.24 km) |
| Boo to Radnevo | 1,220.74 mi (1,964.59 km) |
| Boo to Radomir | 1,175.69 mi (1,892.09 km) |
| Boo to Rakitovo | 1,223.45 mi (1,968.95 km) |
| Boo to Rakovski | 1,211.06 mi (1,949.02 km) |
| Boo to Razgrad | 1,145.14 mi (1,842.93 km) |
| Boo to Razlog | 1,225.15 mi (1,971.69 km) |
| Boo to Ruse | 1,118.69 mi (1,800.36 km) |
| Boo to Samokov | 1,194.89 mi (1,922.99 km) |
| Boo to Sandanski | 1,245.28 mi (2,004.08 km) |
| Boo to Sevlievo | 1,162.74 mi (1,871.24 km) |
| Boo to Shumen | 1,167.28 mi (1,878.55 km) |
| Boo to Silistra | 1,116.41 mi (1,796.69 km) |
| Boo to Sliven | 1,199.72 mi (1,930.77 km) |
