| Houghton le Spring to Popovo | 1,468.74 mi (2,363.71 km) |
| Houghton le Spring to Provadia | 1,521.19 mi (2,448.11 km) |
| Houghton le Spring to Radnevo | 1,507.62 mi (2,426.29 km) |
| Houghton le Spring to Radomir | 1,388.32 mi (2,234.28 km) |
| Houghton le Spring to Rakitovo | 1,456.67 mi (2,344.29 km) |
| Houghton le Spring to Rakovski | 1,473.12 mi (2,370.75 km) |
| Houghton le Spring to Razgrad | 1,470.78 mi (2,367.00 km) |
| Houghton le Spring to Razlog | 1,439.94 mi (2,317.36 km) |
| Houghton le Spring to Ruse | 1,436.47 mi (2,311.77 km) |
| Houghton le Spring to Samokov | 1,420.32 mi (2,285.78 km) |
| Houghton le Spring to Sandanski | 1,449.51 mi (2,332.75 km) |
| Houghton le Spring to Sevlievo | 1,442.82 mi (2,321.99 km) |
| Houghton le Spring to Shumen | 1,497.88 mi (2,410.60 km) |
| Houghton le Spring to Silistra | 1,472.17 mi (2,369.22 km) |
| Houghton le Spring to Sliven | 1,503.85 mi (2,420.22 km) |
