Yes, all Flowcodes are dynamic (with exception to Wifi Flowcodes) which means you can change the destination/landing page at any point in time. To change a redirect link, simply navigate to the My Flowcodes section (you must be logged in). Next, select the code you would like to edit, and scroll down to input a new destination.
Enter your new destination.
The code itself will not be changed, but the destination will. This means you don't have to worry about re-printing or re-downloading your code. It will happen immediately, with no lag.