| Flensburg to Isselburg | 237.74 mi (382.61 km) |
| Flensburg to Issum | 256.44 mi (412.69 km) |
| Flensburg to Itzehoe | 59.29 mi (95.42 km) |
| Flensburg to Jena | 280.99 mi (452.21 km) |
| Flensburg to Jever | 104.00 mi (167.38 km) |
| Flensburg to Jork | 86.76 mi (139.63 km) |
| Flensburg to Juchen | 282.10 mi (453.99 km) |
| Flensburg to Julich | 295.93 mi (476.25 km) |
| Flensburg to Juterbog | 244.01 mi (392.69 km) |
| Flensburg to Kaarst | 272.76 mi (438.97 km) |
| Flensburg to Kaiserslautern | 375.46 mi (604.25 km) |
| Flensburg to Kalkar | 247.11 mi (397.69 km) |
| Flensburg to Kall | 316.38 mi (509.17 km) |
| Flensburg to Kaltenkirchen | 68.43 mi (110.14 km) |
| Flensburg to Kamen | 232.28 mi (373.82 km) |
