| Rheinfelden to Karlovo | 893.74 mi (1,438.33 km) |
| Rheinfelden to Karnobat | 992.33 mi (1,596.99 km) |
| Rheinfelden to Kavarna | 1,030.95 mi (1,659.15 km) |
| Rheinfelden to Kazanlak | 921.23 mi (1,482.58 km) |
| Rheinfelden to Knezha | 834.50 mi (1,343.00 km) |
| Rheinfelden to Kostinbrod | 817.09 mi (1,314.97 km) |
| Rheinfelden to Kozloduy | 810.41 mi (1,304.23 km) |
| Rheinfelden to Kyustendil | 812.23 mi (1,307.16 km) |
| Rheinfelden to Levski | 886.11 mi (1,426.05 km) |
| Rheinfelden to Lom | 786.69 mi (1,266.05 km) |
| Rheinfelden to Lovech | 874.17 mi (1,406.85 km) |
| Rheinfelden to Lukovit | 847.31 mi (1,363.62 km) |
| Rheinfelden to Lyaskovets | 920.54 mi (1,481.46 km) |
| Rheinfelden to Mezdra | 827.86 mi (1,332.32 km) |
| Rheinfelden to Momchilgrad | 959.07 mi (1,543.48 km) |
