| Harker Heights to Devnya | 6,244.94 mi (10,050.26 km) |
| Harker Heights to Dimitrovgrad | 6,231.04 mi (10,027.89 km) |
| Harker Heights to Dobrich | 6,237.00 mi (10,037.48 km) |
| Harker Heights to Dospat | 6,196.88 mi (9,972.91 km) |
| Harker Heights to Dupnitsa | 6,128.50 mi (9,862.87 km) |
| Harker Heights to Elhovo | 6,260.69 mi (10,075.60 km) |
| Harker Heights to Etropole | 6,134.67 mi (9,872.80 km) |
| Harker Heights to Gabrovo | 6,181.98 mi (9,948.94 km) |
| Harker Heights to Gorna Oryahovitsa | 6,182.43 mi (9,949.67 km) |
| Harker Heights to Gotse Delchev | 6,184.47 mi (9,952.95 km) |
| Harker Heights to Harmanli | 6,247.69 mi (10,054.69 km) |
| Harker Heights to Haskovo | 6,235.44 mi (10,034.97 km) |
| Harker Heights to Ihtiman | 6,146.55 mi (9,891.91 km) |
| Harker Heights to Isperih | 6,194.52 mi (9,969.12 km) |
| Harker Heights to Kardzhali | 6,241.68 mi (10,045.01 km) |
