b.flex economy+:
The b.flex economy+ ticket is changeable free of charge, as long as the original fare level is still available. Otherwise, the difference to the next higher available b.flex economy+ fare will be charged additionally.
b.light economy:
On majority of the routes, you may change your ticket (date/flight) for a fee of 30€ per person, per direction, plus the difference between your fare and the lowest applicable fare in b.light economy. It is not possible to change your ticket if it has been booked in S, N or W class.
A €35 administration fee is charged to handle the refund of the amount you are entitled to. Only exceptions are b.flex economy+ and business tickets purchased online via the Brussels Airlines website.
How to cancel your reservation and ask for a refund