| Norristown to Popovo | 4,883.64 mi (7,859.46 km) |
| Norristown to Provadia | 4,938.41 mi (7,947.59 km) |
| Norristown to Radnevo | 4,915.77 mi (7,911.17 km) |
| Norristown to Radomir | 4,783.57 mi (7,698.41 km) |
| Norristown to Rakitovo | 4,853.44 mi (7,810.86 km) |
| Norristown to Rakovski | 4,876.93 mi (7,848.66 km) |
| Norristown to Razgrad | 4,887.21 mi (7,865.20 km) |
| Norristown to Razlog | 4,832.11 mi (7,776.53 km) |
| Norristown to Ruse | 4,852.70 mi (7,809.67 km) |
| Norristown to Samokov | 4,817.17 mi (7,752.48 km) |
| Norristown to Sandanski | 4,837.40 mi (7,785.04 km) |
| Norristown to Sevlievo | 4,852.25 mi (7,808.95 km) |
| Norristown to Shumen | 4,914.32 mi (7,908.83 km) |
| Norristown to Silistra | 4,891.90 mi (7,872.75 km) |
| Norristown to Sliven | 4,915.73 mi (7,911.11 km) |
