| Bostonia to Popovo | 6,683.30 mi (10,755.73 km) |
| Bostonia to Provadia | 6,723.48 mi (10,820.39 km) |
| Bostonia to Radnevo | 6,737.99 mi (10,843.74 km) |
| Bostonia to Radomir | 6,642.97 mi (10,690.82 km) |
| Bostonia to Rakitovo | 6,707.16 mi (10,794.14 km) |
| Bostonia to Rakovski | 6,713.10 mi (10,803.69 km) |
| Bostonia to Razgrad | 6,679.56 mi (10,749.71 km) |
| Bostonia to Razlog | 6,696.01 mi (10,776.18 km) |
| Bostonia to Ruse | 6,648.04 mi (10,698.99 km) |
| Bostonia to Samokov | 6,672.04 mi (10,737.62 km) |
| Bostonia to Sandanski | 6,709.19 mi (10,797.40 km) |
| Bostonia to Sevlievo | 6,673.55 mi (10,740.04 km) |
| Bostonia to Shumen | 6,704.99 mi (10,790.63 km) |
| Bostonia to Silistra | 6,663.11 mi (10,723.24 km) |
| Bostonia to Sliven | 6,725.57 mi (10,823.75 km) |
