| Houthulst to Provadia | 1,263.71 mi (2,033.74 km) |
| Houthulst to Radnevo | 1,236.87 mi (1,990.55 km) |
| Houthulst to Radomir | 1,105.96 mi (1,779.87 km) |
| Houthulst to Rakitovo | 1,175.64 mi (1,892.01 km) |
| Houthulst to Rakovski | 1,197.99 mi (1,927.98 km) |
| Houthulst to Razgrad | 1,211.97 mi (1,950.48 km) |
| Houthulst to Razlog | 1,155.59 mi (1,859.75 km) |
| Houthulst to Ruse | 1,177.48 mi (1,894.96 km) |
| Houthulst to Samokov | 1,139.25 mi (1,833.44 km) |
| Houthulst to Sandanski | 1,162.48 mi (1,870.82 km) |
| Houthulst to Sevlievo | 1,173.63 mi (1,888.77 km) |
| Houthulst to Shumen | 1,238.95 mi (1,993.89 km) |
| Houthulst to Silistra | 1,221.67 mi (1,966.10 km) |
| Houthulst to Sliven | 1,237.63 mi (1,991.77 km) |
| Houthulst to Smolyan | 1,217.73 mi (1,959.75 km) |
