| Prospect Heights to Karlovo | 5,245.47 mi (8,441.77 km) |
| Prospect Heights to Karnobat | 5,323.19 mi (8,566.84 km) |
| Prospect Heights to Kavarna | 5,329.80 mi (8,577.49 km) |
| Prospect Heights to Kazanlak | 5,267.99 mi (8,478.01 km) |
| Prospect Heights to Knezha | 5,177.84 mi (8,332.92 km) |
| Prospect Heights to Kostinbrod | 5,179.67 mi (8,335.87 km) |
| Prospect Heights to Kozloduy | 5,151.64 mi (8,290.76 km) |
| Prospect Heights to Kyustendil | 5,185.85 mi (8,345.82 km) |
| Prospect Heights to Levski | 5,221.67 mi (8,403.46 km) |
| Prospect Heights to Lom | 5,131.87 mi (8,258.95 km) |
| Prospect Heights to Lovech | 5,218.23 mi (8,397.94 km) |
| Prospect Heights to Lukovit | 5,195.38 mi (8,361.16 km) |
| Prospect Heights to Lyaskovets | 5,255.41 mi (8,457.77 km) |
| Prospect Heights to Mezdra | 5,181.05 mi (8,338.09 km) |
| Prospect Heights to Momchilgrad | 5,322.03 mi (8,564.98 km) |
