Reference

The Order of Flats

Flats are in order of descending fifths or ascending fourths starting from B: B flat, E flat, A flat, D flat, G flat, C flat, F flat.

A reader's note: Did you know that you can remember the order of flats by using the BEAD and then adding Good Clean Fun? The order of sharps is FCGDAEB (i.e., remembering "BEAD" and Good Clean Fun backwards).