| Pittsburg to Popovo | 6,470.82 mi (10,413.78 km) |
| Pittsburg to Provadia | 6,506.07 mi (10,470.51 km) |
| Pittsburg to Radnevo | 6,530.34 mi (10,509.56 km) |
| Pittsburg to Radomir | 6,448.22 mi (10,377.40 km) |
| Pittsburg to Rakitovo | 6,509.19 mi (10,475.52 km) |
| Pittsburg to Rakovski | 6,509.97 mi (10,476.79 km) |
| Pittsburg to Razgrad | 6,465.20 mi (10,404.74 km) |
| Pittsburg to Razlog | 6,501.26 mi (10,462.76 km) |
| Pittsburg to Ruse | 6,435.28 mi (10,356.59 km) |
| Pittsburg to Samokov | 6,475.27 mi (10,420.93 km) |
| Pittsburg to Sandanski | 6,516.42 mi (10,487.17 km) |
| Pittsburg to Sevlievo | 6,467.24 mi (10,408.02 km) |
| Pittsburg to Shumen | 6,489.55 mi (10,443.91 km) |
| Pittsburg to Silistra | 6,443.55 mi (10,369.90 km) |
| Pittsburg to Sliven | 6,514.81 mi (10,484.57 km) |
