| Fort Collins to Karlovo | 5,893.18 mi (9,484.16 km) |
| Fort Collins to Karnobat | 5,957.41 mi (9,587.52 km) |
| Fort Collins to Kavarna | 5,949.74 mi (9,575.17 km) |
| Fort Collins to Kazanlak | 5,912.25 mi (9,514.84 km) |
| Fort Collins to Knezha | 5,823.84 mi (9,372.57 km) |
| Fort Collins to Kostinbrod | 5,835.74 mi (9,391.72 km) |
| Fort Collins to Kozloduy | 5,797.70 mi (9,330.50 km) |
| Fort Collins to Kyustendil | 5,848.86 mi (9,412.83 km) |
| Fort Collins to Levski | 5,862.25 mi (9,434.38 km) |
| Fort Collins to Lom | 5,780.58 mi (9,302.95 km) |
| Fort Collins to Lovech | 5,863.01 mi (9,435.61 km) |
| Fort Collins to Lukovit | 5,843.03 mi (9,403.45 km) |
| Fort Collins to Lyaskovets | 5,894.29 mi (9,485.95 km) |
| Fort Collins to Mezdra | 5,831.86 mi (9,385.48 km) |
| Fort Collins to Momchilgrad | 5,973.75 mi (9,613.83 km) |
