| Rietberg to Karlovo | 991.35 mi (1,595.43 km) |
| Rietberg to Karnobat | 1,071.52 mi (1,724.44 km) |
| Rietberg to Kavarna | 1,086.95 mi (1,749.28 km) |
| Rietberg to Kazanlak | 1,014.00 mi (1,631.87 km) |
| Rietberg to Knezha | 923.80 mi (1,486.71 km) |
| Rietberg to Kostinbrod | 926.84 mi (1,491.61 km) |
| Rietberg to Kozloduy | 897.62 mi (1,444.59 km) |
| Rietberg to Kyustendil | 936.31 mi (1,506.85 km) |
| Rietberg to Levski | 968.45 mi (1,558.57 km) |
| Rietberg to Lom | 877.75 mi (1,412.60 km) |
| Rietberg to Lovech | 964.26 mi (1,551.82 km) |
| Rietberg to Lukovit | 941.26 mi (1,514.81 km) |
| Rietberg to Lyaskovets | 1,002.52 mi (1,613.40 km) |
| Rietberg to Mezdra | 927.08 mi (1,491.99 km) |
| Rietberg to Momchilgrad | 1,068.42 mi (1,719.46 km) |
