| Douglas to Popovo | 1,699.65 mi (2,735.32 km) |
| Douglas to Provadia | 1,756.74 mi (2,827.21 km) |
| Douglas to Radnevo | 1,726.96 mi (2,779.28 km) |
| Douglas to Radomir | 1,591.88 mi (2,561.89 km) |
| Douglas to Rakitovo | 1,661.80 mi (2,674.41 km) |
| Douglas to Rakovski | 1,686.68 mi (2,714.45 km) |
| Douglas to Razgrad | 1,704.90 mi (2,743.78 km) |
| Douglas to Razlog | 1,640.08 mi (2,639.46 km) |
| Douglas to Ruse | 1,670.45 mi (2,688.33 km) |
| Douglas to Samokov | 1,625.62 mi (2,616.18 km) |
| Douglas to Sandanski | 1,645.26 mi (2,647.80 km) |
| Douglas to Sevlievo | 1,664.43 mi (2,678.65 km) |
| Douglas to Shumen | 1,731.81 mi (2,787.08 km) |
| Douglas to Silistra | 1,715.44 mi (2,760.73 km) |
| Douglas to Sliven | 1,729.02 mi (2,782.59 km) |
