| Security-Widefield to Popovo | 5,988.72 mi (9,637.92 km) |
| Security-Widefield to Provadia | 6,033.35 mi (9,709.74 km) |
| Security-Widefield to Radnevo | 6,038.25 mi (9,717.62 km) |
| Security-Widefield to Radomir | 5,932.34 mi (9,547.17 km) |
| Security-Widefield to Rakitovo | 5,998.82 mi (9,654.16 km) |
| Security-Widefield to Rakovski | 6,009.37 mi (9,671.15 km) |
| Security-Widefield to Razgrad | 5,986.86 mi (9,634.91 km) |
| Security-Widefield to Razlog | 5,984.90 mi (9,631.77 km) |
| Security-Widefield to Ruse | 5,954.09 mi (9,582.19 km) |
| Security-Widefield to Samokov | 5,962.94 mi (9,596.43 km) |
| Security-Widefield to Sandanski | 5,996.23 mi (9,650.01 km) |
| Security-Widefield to Sevlievo | 5,973.16 mi (9,612.87 km) |
| Security-Widefield to Shumen | 6,013.10 mi (9,677.15 km) |
| Security-Widefield to Silistra | 5,975.78 mi (9,617.08 km) |
| Security-Widefield to Sliven | 6,028.91 mi (9,702.59 km) |
