| Portland to Popovo | 6,005.06 mi (9,664.21 km) |
| Portland to Provadia | 6,037.32 mi (9,716.13 km) |
| Portland to Radnevo | 6,067.10 mi (9,764.05 km) |
| Portland to Radomir | 5,993.17 mi (9,645.07 km) |
| Portland to Rakitovo | 6,051.84 mi (9,739.50 km) |
| Portland to Rakovski | 6,049.52 mi (9,735.76 km) |
| Portland to Razgrad | 5,998.38 mi (9,653.46 km) |
| Portland to Razlog | 6,045.92 mi (9,729.97 km) |
| Portland to Ruse | 5,969.52 mi (9,607.02 km) |
| Portland to Samokov | 6,018.83 mi (9,686.37 km) |
| Portland to Sandanski | 6,062.23 mi (9,756.22 km) |
| Portland to Sevlievo | 6,005.11 mi (9,664.30 km) |
| Portland to Shumen | 6,021.99 mi (9,691.45 km) |
| Portland to Silistra | 5,973.87 mi (9,614.01 km) |
| Portland to Sliven | 6,049.83 mi (9,736.26 km) |
