| Idaho Falls to Karlovo | 5,913.71 mi (9,517.20 km) |
| Idaho Falls to Karnobat | 5,968.23 mi (9,604.94 km) |
| Idaho Falls to Kavarna | 5,951.52 mi (9,578.05 km) |
| Idaho Falls to Kazanlak | 5,930.24 mi (9,543.80 km) |
| Idaho Falls to Knezha | 5,844.20 mi (9,405.33 km) |
| Idaho Falls to Kostinbrod | 5,862.60 mi (9,434.95 km) |
| Idaho Falls to Kozloduy | 5,818.46 mi (9,363.90 km) |
| Idaho Falls to Kyustendil | 5,880.21 mi (9,463.28 km) |
| Idaho Falls to Levski | 5,878.52 mi (9,460.57 km) |
| Idaho Falls to Lom | 5,803.31 mi (9,339.52 km) |
| Idaho Falls to Lovech | 5,882.03 mi (9,466.20 km) |
| Idaho Falls to Lukovit | 5,864.21 mi (9,437.53 km) |
| Idaho Falls to Lyaskovets | 5,909.02 mi (9,509.64 km) |
| Idaho Falls to Mezdra | 5,855.28 mi (9,423.16 km) |
| Idaho Falls to Momchilgrad | 5,995.85 mi (9,649.38 km) |
