| Houma to Popovo | 6,011.04 mi (9,673.84 km) |
| Houma to Provadia | 6,064.97 mi (9,760.63 km) |
| Houma to Radnevo | 6,044.88 mi (9,728.29 km) |
| Houma to Radomir | 5,914.27 mi (9,518.09 km) |
| Houma to Rakitovo | 5,984.08 mi (9,630.45 km) |
| Houma to Rakovski | 6,006.72 mi (9,666.88 km) |
| Houma to Razgrad | 6,014.07 mi (9,678.71 km) |
| Houma to Razlog | 5,963.16 mi (9,596.78 km) |
| Houma to Ruse | 5,979.62 mi (9,623.26 km) |
| Houma to Samokov | 5,947.75 mi (9,571.98 km) |
| Houma to Sandanski | 5,968.79 mi (9,605.84 km) |
| Houma to Sevlievo | 5,981.03 mi (9,625.54 km) |
| Houma to Shumen | 6,041.19 mi (9,722.36 km) |
| Houma to Silistra | 6,017.03 mi (9,683.48 km) |
| Houma to Sliven | 6,044.03 mi (9,726.92 km) |
