| Greenbelt to Popovo | 4,997.03 mi (8,041.94 km) |
| Greenbelt to Provadia | 5,051.82 mi (8,130.12 km) |
| Greenbelt to Radnevo | 5,029.07 mi (8,093.51 km) |
| Greenbelt to Radomir | 4,896.73 mi (7,880.53 km) |
| Greenbelt to Rakitovo | 4,966.61 mi (7,992.99 km) |
| Greenbelt to Rakovski | 4,990.18 mi (8,030.93 km) |
| Greenbelt to Razgrad | 5,000.61 mi (8,047.71 km) |
| Greenbelt to Razlog | 4,945.23 mi (7,958.58 km) |
| Greenbelt to Ruse | 4,966.11 mi (7,992.18 km) |
| Greenbelt to Samokov | 4,930.34 mi (7,934.62 km) |
| Greenbelt to Sandanski | 4,950.46 mi (7,966.99 km) |
| Greenbelt to Sevlievo | 4,965.58 mi (7,991.33 km) |
| Greenbelt to Shumen | 5,027.72 mi (8,091.34 km) |
| Greenbelt to Silistra | 5,005.34 mi (8,055.31 km) |
| Greenbelt to Sliven | 5,029.09 mi (8,093.53 km) |
