| Harker Heights to Popovo | 6,191.09 mi (9,963.60 km) |
| Harker Heights to Provadia | 6,241.88 mi (10,045.34 km) |
| Harker Heights to Radnevo | 6,231.17 mi (10,028.10 km) |
| Harker Heights to Radomir | 6,108.86 mi (9,831.25 km) |
| Harker Heights to Rakitovo | 6,177.97 mi (9,942.48 km) |
| Harker Heights to Rakovski | 6,196.23 mi (9,971.87 km) |
| Harker Heights to Razgrad | 6,192.27 mi (9,965.50 km) |
| Harker Heights to Razlog | 6,159.51 mi (9,912.77 km) |
| Harker Heights to Ruse | 6,158.19 mi (9,910.65 km) |
| Harker Heights to Samokov | 6,141.52 mi (9,883.83 km) |
| Harker Heights to Sandanski | 6,167.31 mi (9,925.33 km) |
| Harker Heights to Sevlievo | 6,166.35 mi (9,923.78 km) |
| Harker Heights to Shumen | 6,219.27 mi (10,008.95 km) |
| Harker Heights to Silistra | 6,189.86 mi (9,961.61 km) |
| Harker Heights to Sliven | 6,227.09 mi (10,021.53 km) |
