| Herndon to Popovo | 5,018.06 mi (8,075.78 km) |
| Herndon to Provadia | 5,072.72 mi (8,163.76 km) |
| Herndon to Radnevo | 5,050.39 mi (8,127.82 km) |
| Herndon to Radomir | 4,918.38 mi (7,915.37 km) |
| Herndon to Rakitovo | 4,988.25 mi (8,027.81 km) |
| Herndon to Rakovski | 5,011.63 mi (8,065.45 km) |
| Herndon to Razgrad | 5,021.56 mi (8,081.42 km) |
| Herndon to Razlog | 4,966.97 mi (7,993.56 km) |
| Herndon to Ruse | 4,987.06 mi (8,025.90 km) |
| Herndon to Samokov | 4,951.97 mi (7,969.42 km) |
| Herndon to Sandanski | 4,972.29 mi (8,002.13 km) |
| Herndon to Sevlievo | 4,986.84 mi (8,025.54 km) |
| Herndon to Shumen | 5,048.67 mi (8,125.05 km) |
| Herndon to Silistra | 5,026.04 mi (8,088.63 km) |
| Herndon to Sliven | 5,050.26 mi (8,127.61 km) |
