BetterSN is a Chrome plugin that makes some enhancements to the Brussels Airlines website. It started as a side project to fix some issues related to the site's new booking engine. 

The most important of these is the search itself. As you can imagine, the search for a flexible date in the new booking engine is not exactly simple, especially if you want to keep your budget in mind. By making some changes to how the search is set up, you can make it a lot easier.

Alternatively, you'll be frustrated with the fact that you couldn't make it more obvious when you had reached the minimum price for a flight. But with BetterSN, you will always be able to see the lowest price that you can fly for a flexible date.