| Pittsburgh to Popovo | 5,050.44 mi (8,127.89 km) |
| Pittsburgh to Provadia | 5,103.80 mi (8,213.78 km) |
| Pittsburgh to Radnevo | 5,085.69 mi (8,184.63 km) |
| Pittsburgh to Radomir | 4,957.24 mi (7,977.90 km) |
| Pittsburgh to Rakitovo | 5,026.91 mi (8,090.03 km) |
| Pittsburgh to Rakovski | 5,048.33 mi (8,124.50 km) |
| Pittsburgh to Razgrad | 5,053.10 mi (8,132.18 km) |
| Pittsburgh to Razlog | 5,006.73 mi (8,057.55 km) |
| Pittsburgh to Ruse | 5,018.69 mi (8,076.81 km) |
| Pittsburgh to Samokov | 4,990.51 mi (8,031.45 km) |
| Pittsburgh to Sandanski | 5,013.07 mi (8,067.76 km) |
| Pittsburgh to Sevlievo | 5,021.56 mi (8,081.42 km) |
| Pittsburgh to Shumen | 5,080.22 mi (8,175.83 km) |
| Pittsburgh to Silistra | 5,055.15 mi (8,135.48 km) |
| Pittsburgh to Sliven | 5,084.08 mi (8,182.04 km) |
