| Denver to Popovo | 5,935.00 mi (9,551.46 km) |
| Denver to Provadia | 5,979.15 mi (9,622.50 km) |
| Denver to Radnevo | 5,985.17 mi (9,632.19 km) |
| Denver to Radomir | 5,880.58 mi (9,463.89 km) |
| Denver to Rakitovo | 5,946.80 mi (9,570.44 km) |
| Denver to Rakovski | 5,956.77 mi (9,586.49 km) |
| Denver to Razgrad | 5,932.92 mi (9,548.11 km) |
| Denver to Razlog | 5,933.24 mi (9,548.63 km) |
| Denver to Ruse | 5,900.28 mi (9,495.59 km) |
| Denver to Samokov | 5,911.00 mi (9,512.84 km) |
| Denver to Sandanski | 5,944.82 mi (9,567.27 km) |
| Denver to Sevlievo | 5,920.12 mi (9,527.52 km) |
| Denver to Shumen | 5,959.08 mi (9,590.22 km) |
| Denver to Silistra | 5,921.23 mi (9,529.29 km) |
| Denver to Sliven | 5,975.46 mi (9,616.57 km) |
